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Prof. Panagiotis Tsiakaras
Department of Mechanical Engineering, School of Engineering, University of Thessaly, Sekeri 1, Leoforos Athinon, Pedion Areos, 38334 Volos, Greece

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0 Electrocatalysis
0 Energy Conversion Systems
0 Solid State electrochemistry
0 Electrochemical devices engineering
0 Materials for fuel cells

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Electrocatalysis
Energy Conversion Systems
Solid State electrochemistry

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Journal article
Published: 13 July 2021 in Applied Catalysis B: Environmental
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Herein, we report borophene decorated with Ag nanoparticles ([email protected]) as a support, which shows greatly enhanced oxygen-evolution-reaction (OER) performance for Co3O4 catalysts. The excellent OER performance of Co3O4[email protected] is attributed into two main reasons. First, the conductive Ag-nanoparticles on borophene facilitate the growth of thin Co3O4 nanoplates based on an epitaxy model that greatly enhances the population of Co3O4 catalyst sites on the surface. In the meantime, Ag nanoparticles increase the electrical conductivity of the support, facilitating electrons-transfer from CoⅢ atoms to form catalytically-active CoⅣ sites. Second, the B atoms strongly interact with Co and O atoms on the Co3O4 nanoplates, greatly reducing the energy barrier of OER rate-determining procedure and increasing their stability on borophene supports. The Co3O4[email protected] requires an overpotential of 270 mV and exhibits a Tafel-slope of 62 mV dec-1 to deliver an oxygen-evolving current-density of 10 mA cm−2, indicating 60 mV lower overpotential and 27 mV dec-1 lower Tafel-slop value than the Co3O4[email protected] catalysts.

ACS Style

Ali Saad; Dongqing Liu; Yuchen Wu; Zhaoqi Song; Ying Li; Tayyaba Najam; Kai Zong; Panagiotis Tsiakaras; Xingke Cai. Ag nanoparticles modified crumpled borophene supported Co3O4 catalyst showing superior oxygen evolution reaction (OER) performance. Applied Catalysis B: Environmental 2021, 298, 120529 .

AMA Style

Ali Saad, Dongqing Liu, Yuchen Wu, Zhaoqi Song, Ying Li, Tayyaba Najam, Kai Zong, Panagiotis Tsiakaras, Xingke Cai. Ag nanoparticles modified crumpled borophene supported Co3O4 catalyst showing superior oxygen evolution reaction (OER) performance. Applied Catalysis B: Environmental. 2021; 298 ():120529.

Chicago/Turabian Style

Ali Saad; Dongqing Liu; Yuchen Wu; Zhaoqi Song; Ying Li; Tayyaba Najam; Kai Zong; Panagiotis Tsiakaras; Xingke Cai. 2021. "Ag nanoparticles modified crumpled borophene supported Co3O4 catalyst showing superior oxygen evolution reaction (OER) performance." Applied Catalysis B: Environmental 298, no. : 120529.

Journal article
Published: 10 June 2021 in Advanced Energy Materials
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Herein, a N, S co-doped carbon encapsulating Co9S8 nanoparticles ([email protected], S–C) catalyst is successfully synthesized by a new precursor of Co-pyridine coordinated-polymer consisting of 2,6-diacetylpyridine and 4,4′-dithiodianiline. Benefiting from the abundant pore-structure (average pore-size ≈25nm) and unique electronic-properties of the Co9S8 and N, S–C layer, the as-prepared [email protected], S-C exhibits rapid oxygen reduction reaction (ORR) kinetics with high electron transfer number of ≈3.998 and demonstrates a low overpotential of 304 mV for the oxygen evolution reaction (OER). It exhibits a small potential difference of 0.647V for overall ORR/OER activity, outperforming most of the non-precious metal-catalysts previously reported. The rechargeable Zn–Air battery test further demonstrates its excellent activity and stability, in which the battery delivers a maximum power density output of 259 mW cm−2, a specific capacity of 862 mAh gZn−1, and after continuous 110 h operation the charge-discharge round-trip efficiency only reduces by 4.83%. Theoretical calculation studies show that the surface N, S–C layers and Co9S8 can adjust each other's Fermi levels, so that the adsorption energy of [email protected], S–C on O intermediate is more favorable than using Co9S8 and N, S–C alone. This study reveals the structure-function relationship of coated-nanostructures with multifunctional electrocatalytic properties, and provides a feasible strategy for the design of non-noble metal-catalysts.

ACS Style

Dandan Lyu; Sixian Yao; Asad Ali; Zhi Qun Tian; Panagiotis Tsiakaras; Pei Kang Shen. N, S Codoped Carbon Matrix‐Encapsulated Co 9 S 8 Nanoparticles as a Highly Efficient and Durable Bifunctional Oxygen Redox Electrocatalyst for Rechargeable Zn–Air Batteries. Advanced Energy Materials 2021, 2101249 .

AMA Style

Dandan Lyu, Sixian Yao, Asad Ali, Zhi Qun Tian, Panagiotis Tsiakaras, Pei Kang Shen. N, S Codoped Carbon Matrix‐Encapsulated Co 9 S 8 Nanoparticles as a Highly Efficient and Durable Bifunctional Oxygen Redox Electrocatalyst for Rechargeable Zn–Air Batteries. Advanced Energy Materials. 2021; ():2101249.

Chicago/Turabian Style

Dandan Lyu; Sixian Yao; Asad Ali; Zhi Qun Tian; Panagiotis Tsiakaras; Pei Kang Shen. 2021. "N, S Codoped Carbon Matrix‐Encapsulated Co 9 S 8 Nanoparticles as a Highly Efficient and Durable Bifunctional Oxygen Redox Electrocatalyst for Rechargeable Zn–Air Batteries." Advanced Energy Materials , no. : 2101249.

Journal article
Published: 07 June 2021 in Renewable Energy
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Herein, two novel electrocatalysts are simultaneously grown on Ni foam (NF) through a one-step hydrothermal method. The as-prepared Ru–MoO3-x NF exhibits good performance for HER with low overpotentials of 12 mV at 10 mA cm−2 and 49 mV at 100 mA cm−2, a low Tafel slope of 32.96 mV dec−1, as well as an excellent durability at least lasting 17 h in alkaline media. The Fe3O4–NiFe LDH NF (layered double hydroxide nickel foam) ultrathin nanosheets electrode shows a low OER overpotential of 216 mV at 10 mA cm−2 and a small Tafel slope of 42.42 mV dec−1. Moreover, a two-electrode water splitting device is fabricated with Ru–MoO3-x NF as cathode and Fe3O4–NiFe LDH NF as anode, it only requires 1.46 V at 10 mA cm−2 and exhibits a long term durability without obvious loss of activity after continuously operating for 180 h. The superior catalytic behavior should be originated from the open heterostructure and oxygen vacancies with high intrinsic activity, abundant exposed active sites, and fast charge transfer. This work provides a new strategy to design heterostructure and transition metal oxides catalysts with improved catalytic activity and durability by a facile route for overall water splitting or other applications.

ACS Style

Jianmei Cen; Enjun Jiang; Yuqing Zhu; Zhenyu Chen; Panagiotis Tsiakaras; Pei Kang Shen. Enhanced electrocatalytic overall water splitting over novel one-pot synthesized Ru–MoO3- and Fe3O4–NiFe layered double hydroxide on Ni foam. Renewable Energy 2021, 177, 1346 -1355.

AMA Style

Jianmei Cen, Enjun Jiang, Yuqing Zhu, Zhenyu Chen, Panagiotis Tsiakaras, Pei Kang Shen. Enhanced electrocatalytic overall water splitting over novel one-pot synthesized Ru–MoO3- and Fe3O4–NiFe layered double hydroxide on Ni foam. Renewable Energy. 2021; 177 ():1346-1355.

Chicago/Turabian Style

Jianmei Cen; Enjun Jiang; Yuqing Zhu; Zhenyu Chen; Panagiotis Tsiakaras; Pei Kang Shen. 2021. "Enhanced electrocatalytic overall water splitting over novel one-pot synthesized Ru–MoO3- and Fe3O4–NiFe layered double hydroxide on Ni foam." Renewable Energy 177, no. : 1346-1355.

Review article
Published: 24 May 2021 in Applied Catalysis B: Environmental
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Single atoms loaded on two-dimensional materials ([email protected]) have been broadly explored recently in the field of catalysis. Compared with conventional supports, 2D materials with large surface areas, unique geometric structure, and electronic properties can boost the catalytic performances of anchored single noble atoms (SNAs). Meanwhile, the monodispersed atoms not only show much higher atom utilization, than their bulk or nanoparticle counterparts, but also provide an alternative reaction pathway with excellent activity and selectivity. However, the combination of a 2D material with single atoms still comes across some challenges, such as low mass loading, difficulty in anchoring the single atoms on the 2D substrates, and difficulty in mass production. In this review, single noble-metal atoms based on two-dimensional materials ([email protected]) is critically discussed. First, [email protected] are generally introduced, including their definition, characterization, and their importance and advantages in catalysis applications. Then, the recent progress in using the [email protected] for the photocatalytic, electrocatalytic, and thermocatalytic reactions is thoroughly reviewed and critically discussed. The superiority and the disadvantages of [email protected] in each catalytic reaction are also considered. Finally, the current challenges and opportunities in the synthesis and applications of [email protected] are clearly highlighted.

ACS Style

Dongqing Liu; Akaash Barbar; Tayyaba Najam; Muhammad Sufyan Javed; Jun Shen; Panagiotis Tsiakaras; Xingke Cai. Single noble metal atoms doped 2D materials for catalysis. Applied Catalysis B: Environmental 2021, 297, 120389 .

AMA Style

Dongqing Liu, Akaash Barbar, Tayyaba Najam, Muhammad Sufyan Javed, Jun Shen, Panagiotis Tsiakaras, Xingke Cai. Single noble metal atoms doped 2D materials for catalysis. Applied Catalysis B: Environmental. 2021; 297 ():120389.

Chicago/Turabian Style

Dongqing Liu; Akaash Barbar; Tayyaba Najam; Muhammad Sufyan Javed; Jun Shen; Panagiotis Tsiakaras; Xingke Cai. 2021. "Single noble metal atoms doped 2D materials for catalysis." Applied Catalysis B: Environmental 297, no. : 120389.

Research article
Published: 10 May 2021 in ACS Applied Materials & Interfaces
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Fe–N–C-based electrocatalysts have been developed as an encouraging substitute compared to their expensive Pt-containing equivalents for the oxygen reduction reaction (ORR). However, they still face major durability challenges from the in- situ production of Fenton radicals. Therefore, the synthesis of Fe-free ORR catalysts is among the emerging concerns. Herein, we have precisely applied a multistep heating strategy to produce mesoporous N-doped carbon nanostructures with Mn-/Co-Nx dual moieties from mixed-metal zeolitic imidazolate frameworks (ZIFs). It is found that their unique structure, with dual-metallic active sites, not only offers a high electrochemical performance for the ORR (E1/2 = 0.83 V vs reversible hydrogen electrode (RHE) in acid media), but also enhances the operational durability of the catalyst after 20 000 cycles with 97% of retention and very low H2O2 production (<5%) in 0.1 M HClO4. In addition, the catalyst performs well toward the ORR also in alkaline solution (exhibiting E1/2 = 0.90 V and 30 000 cyclic stability).

ACS Style

Syed Shoaib Ahmad Shah; Tayyaba Najam; Muhammad Sufyan Javed; Mohammed M. Rahman; Panagiotis Tsiakaras. Novel Mn-/Co-Nx Moieties Captured in N-Doped Carbon Nanotubes for Enhanced Oxygen Reduction Activity and Stability in Acidic and Alkaline Media. ACS Applied Materials & Interfaces 2021, 13, 23191 -23200.

AMA Style

Syed Shoaib Ahmad Shah, Tayyaba Najam, Muhammad Sufyan Javed, Mohammed M. Rahman, Panagiotis Tsiakaras. Novel Mn-/Co-Nx Moieties Captured in N-Doped Carbon Nanotubes for Enhanced Oxygen Reduction Activity and Stability in Acidic and Alkaline Media. ACS Applied Materials & Interfaces. 2021; 13 (19):23191-23200.

Chicago/Turabian Style

Syed Shoaib Ahmad Shah; Tayyaba Najam; Muhammad Sufyan Javed; Mohammed M. Rahman; Panagiotis Tsiakaras. 2021. "Novel Mn-/Co-Nx Moieties Captured in N-Doped Carbon Nanotubes for Enhanced Oxygen Reduction Activity and Stability in Acidic and Alkaline Media." ACS Applied Materials & Interfaces 13, no. 19: 23191-23200.

Review article
Published: 23 April 2021 in Journal of Electroanalytical Chemistry
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The SARS-CoV-2 virus is still causing a dramatic loss of human lives worldwide, constituting an unprecedented challenge for the society, public health and economy, to overcome. The up-to-date diagnostic tests, PCR, antibody ELISA and Rapid Antigen, require special equipment, hours of analysis and special staff. For this reason, many research groups have focused recently on the design and development of electrochemical biosensors for the SARS-CoV-2 detection, indicating that they can play a significant role in controlling COVID disease. In this review we thoroughly discuss the transducer electrode nanomaterials investigated in order to improve the sensitivity, specificity and response time of the as-developed SARS-CoV-2 electrochemical biosensors. Particularly, we mainly focus on the results appeard on Au-based and carbon or graphene-based electrodes, which are the main material groups recently investigated worldwidely. Additionally, the adopted electrochemical detection techniques are also discussed, highlighting their pros and cos. The nanomaterial-based electrochemical biosensors could enable a fast, accurate and without special cost, virus detection. However, further research is required in terms of new nanomaterials and synthesis strategies in order the SARS-CoV-2 electrochemical biosensors to be commercialized.

ACS Style

G. Balkourani; A. Brouzgou; M. Archonti; N. Papandrianos; S. Song; P. Tsiakaras. Emerging materials for the electrochemical detection of COVID-19. Journal of Electroanalytical Chemistry 2021, 893, 115289 -115289.

AMA Style

G. Balkourani, A. Brouzgou, M. Archonti, N. Papandrianos, S. Song, P. Tsiakaras. Emerging materials for the electrochemical detection of COVID-19. Journal of Electroanalytical Chemistry. 2021; 893 ():115289-115289.

Chicago/Turabian Style

G. Balkourani; A. Brouzgou; M. Archonti; N. Papandrianos; S. Song; P. Tsiakaras. 2021. "Emerging materials for the electrochemical detection of COVID-19." Journal of Electroanalytical Chemistry 893, no. : 115289-115289.

Research article
Published: 22 December 2020 in ACS Applied Materials & Interfaces
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The initial growth mode of oxide on alloy plays a decisive role in the development of protective oxide scales on metals and alloys, which is critical for their functionality for high temperature applications. However, the atomistic mechanisms dictating that the oxide growth remain elusive due to the lack of direct in situ observation of the initial oxide nucleation and growth at atomic-scale. Herein, we employed environmental transmission electron microscopy and the first-principles calculations to elucidate the initial atomic process of nickel–chromium (Ni–Cr) alloy oxidation. We directly revealed three different oxide growth modes of initial NiO islands on Ni–Cr alloy upon oxidation by O2, which result in distinct crystallography and morphology. The multimode oxide growth leads to irregular-shaped oxides, which is shown to be sensitive to the local mass transport. This localization of oxide growth mode is also demonstrated by the identified vigorous competence in oxide growth and thus shown to be kinetically controlled. The concept exemplified here provides insights into the oxide formation and has significant implications in other material and chemical processes involving oxygen gas, such as corrosion, heterogeneous catalysis, and ionic conduction.

ACS Style

Shuangbao Wang; Zejian Dong; Lifeng Zhang; Panagiotis Tsiakaras; Pei Kang Shen; Langli Luo. Atomic Scale Mechanisms of Multimode Oxide Growth on Nickel–Chromium Alloy: Direct In Situ Observation of the Initial Oxide Nucleation and Growth. ACS Applied Materials & Interfaces 2020, 13, 1903 -1913.

AMA Style

Shuangbao Wang, Zejian Dong, Lifeng Zhang, Panagiotis Tsiakaras, Pei Kang Shen, Langli Luo. Atomic Scale Mechanisms of Multimode Oxide Growth on Nickel–Chromium Alloy: Direct In Situ Observation of the Initial Oxide Nucleation and Growth. ACS Applied Materials & Interfaces. 2020; 13 (1):1903-1913.

Chicago/Turabian Style

Shuangbao Wang; Zejian Dong; Lifeng Zhang; Panagiotis Tsiakaras; Pei Kang Shen; Langli Luo. 2020. "Atomic Scale Mechanisms of Multimode Oxide Growth on Nickel–Chromium Alloy: Direct In Situ Observation of the Initial Oxide Nucleation and Growth." ACS Applied Materials & Interfaces 13, no. 1: 1903-1913.

Journal article
Published: 05 October 2020 in Applied Catalysis B: Environmental
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Electrocatalytic nitrogen reduction offers a dream way to produce active nitrogen for agriculture and high-energy-dense carbon-free fuels for our blue planet. However, it suffers from extremely low faradaic efficiency due to the conversion rate is greatly limited by the competing hydrogen reduction reaction, seeking for a new strategy to solve the bottleneck problem is highly desirable. Herein, H+ ions transfer rate can be regulated linearly by tuning the pore numbers of membrane in an H-cell, furthermore, the Faradaic efficiency could be continuously regulated in the same way. Meanwhile, a physical model has been constructed to reveal the changing mechanism of Faradaic efficiency, the theoretical results is in good accordance with experimental results obtained by the synthetic plasma-enhanced bimetallic catalyst (FeAg nanoclusters dispersed on Si nanowire), this study achieve a continuous enhancement of Faradaic efficiency from 9.04 % to 41.86 %.

ACS Style

Yang Liu; Xiaoran Zhang; Zhenyu Chen; Xinyi Zhang; Panagiotis Tsiakaras; Pei Kang Shen. Electrocatalytic reduction of nitrogen on FeAg/Si for ammonia synthesis: A simple strategy for continuous regulation of faradaic efficiency by controlling H+ ions transfer rate. Applied Catalysis B: Environmental 2020, 283, 119606 .

AMA Style

Yang Liu, Xiaoran Zhang, Zhenyu Chen, Xinyi Zhang, Panagiotis Tsiakaras, Pei Kang Shen. Electrocatalytic reduction of nitrogen on FeAg/Si for ammonia synthesis: A simple strategy for continuous regulation of faradaic efficiency by controlling H+ ions transfer rate. Applied Catalysis B: Environmental. 2020; 283 ():119606.

Chicago/Turabian Style

Yang Liu; Xiaoran Zhang; Zhenyu Chen; Xinyi Zhang; Panagiotis Tsiakaras; Pei Kang Shen. 2020. "Electrocatalytic reduction of nitrogen on FeAg/Si for ammonia synthesis: A simple strategy for continuous regulation of faradaic efficiency by controlling H+ ions transfer rate." Applied Catalysis B: Environmental 283, no. : 119606.

Journal article
Published: 28 August 2020 in Chinese Journal of Catalysis
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Pt based materials are the most efficient electrocatalysts for the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) in fuel cells. Maximizing the utilization of Pt based materials by modulating their morphologies to expose more active sites is a fundamental objective for the practical application of fuel cells. Herein, we report a new class of hierarchically skeletal Pt-Ni nanocrystals (HSNs) with a multi-layered structure, prepared by an inorganic acid-induced solvothermal method. The addition of H2SO4 to the synthetic protocol provides a critical trigger for the successful growth of Pt-Ni nanocrystals with the desired structure. The Pt-Ni HSNs synthesized by this method exhibit enhanced mass activity of 1.25 A mgpt−1 at 0.9 V (versus the reversible hydrogen electrode) towards ORR in 0.1-M HClO4, which is superior to that of Pt-Ni multi-branched nanocrystals obtained by the same method in the absence of inorganic acid; it is additionally 8.9-fold higher than that of the commercial Pt/C catalyst. Meanwhile, it displays enhanced stability, with only 21.6% mass activity loss after 10,000 cycles (0.6–1.0 V) for ORR. Furthermore, the Pt-Ni HSNs show enhanced activity and anti-toxic ability in CO for MOR. The superb activity of the Pt-Ni HSNs for ORR and MOR is fully attributed to an extensively exposed electrochemical surface area and high intrinsic activity, induced by strain effects, provided by the unique hierarchically skeletal alloy structure. The novel open and hierarchical structure of Pt-Ni alloy provides a promising approach for significant improvements of the activity of Pt based alloy electrocatalysts.

ACS Style

Shibo Li; Zhi Qun Tian; Yang Liu; Zheng Jang; Syed Waqar Hasan; Xingfa Chen; Panagiotis Tsiakaras; Pei Kang Shen. Hierarchically skeletal multi-layered Pt-Ni nanocrystals for highly efficient oxygen reduction and methanol oxidation reactions. Chinese Journal of Catalysis 2020, 42, 648 -657.

AMA Style

Shibo Li, Zhi Qun Tian, Yang Liu, Zheng Jang, Syed Waqar Hasan, Xingfa Chen, Panagiotis Tsiakaras, Pei Kang Shen. Hierarchically skeletal multi-layered Pt-Ni nanocrystals for highly efficient oxygen reduction and methanol oxidation reactions. Chinese Journal of Catalysis. 2020; 42 (4):648-657.

Chicago/Turabian Style

Shibo Li; Zhi Qun Tian; Yang Liu; Zheng Jang; Syed Waqar Hasan; Xingfa Chen; Panagiotis Tsiakaras; Pei Kang Shen. 2020. "Hierarchically skeletal multi-layered Pt-Ni nanocrystals for highly efficient oxygen reduction and methanol oxidation reactions." Chinese Journal of Catalysis 42, no. 4: 648-657.

Journal article
Published: 27 August 2020 in International Journal of Hydrogen Energy
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In the present work, carbon supported PtMe (Me = Ir or Pd) electrocatalysts, with different atomic ratios (Pt/Me (20 wt%) = 3:1, 1:1, 1:3), are thoroughly investigated towards CO tolerance and durability, as anode and cathode for H2-PEMFCs (hydrogen fed proton exchange membrane fuel cells) application. The electrocatalysts are prepared via a pulse-microwave assisted polyol synthesis method and their durability and electrocatalytic activity in presence and absence of CO are evaluated using the techniques of electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA) and rotating disk electrode (RDE). For the investigation of CO tolerance a protocol is set that could be used by other research groups, since various procedures are reported in literature. It is found that Pd/C shows higher CO tolerance than Pt/C, while the PtPd3/C exhibits the highest CO tolerance ability, even after being exposed for 9 h at 400 ppm CO. Despite the fact that Pt3Ir/C shows higher CO tolerance ability than Pt/C, it cannot resist at such high CO concentrations for more than 6 h. Finally, it is found that PtIr/C and PtPd/C exhibit very good durability even after 5000 accelerated durability test (ADT) cycles, while Pt3Pd/C and PtPd/C present the highest mass activities (339.4 and 410 mA/mgPt respectively at 0.9 V), which are 4 and 5 times higher than the one observed over commercial Pt/C (82.75 mA/mgPt).

ACS Style

Angeliki Brouzgou; Antonis Seretis; Shuqin Song; Pei Kang Shen; Panagiotis Tsiakaras. CO tolerance and durability study of PtMe(Me = Ir or Pd) electrocatalysts for H2-PEMFC application. International Journal of Hydrogen Energy 2020, 46, 13865 -13877.

AMA Style

Angeliki Brouzgou, Antonis Seretis, Shuqin Song, Pei Kang Shen, Panagiotis Tsiakaras. CO tolerance and durability study of PtMe(Me = Ir or Pd) electrocatalysts for H2-PEMFC application. International Journal of Hydrogen Energy. 2020; 46 (26):13865-13877.

Chicago/Turabian Style

Angeliki Brouzgou; Antonis Seretis; Shuqin Song; Pei Kang Shen; Panagiotis Tsiakaras. 2020. "CO tolerance and durability study of PtMe(Me = Ir or Pd) electrocatalysts for H2-PEMFC application." International Journal of Hydrogen Energy 46, no. 26: 13865-13877.

Journal article
Published: 21 August 2020 in Applied Catalysis B: Environmental
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A novel self-etched engineering of Pt-Co nanodendrite in nanoframe (Pt-Co ND-NF) synthesized through a simple one-pot approach, for the first-time. The modulation mechanism of Pt-Co ND-NF formation is established by investigating critical factors of adjusting: i) the water amount, ii) the ratio of mixed solvent oleylamine to oleic acid and iii) the amount of surfactant hexadecyl trimethyl ammonium bromide. Besides, the formation process of Pt-Co ND-NF is carefully explored with reaction time progress, further confirming the state of Pt-Co nanoframe blockade on Pt-Co nanodendrite (ND). Pt-Co ND-NF exhibits improved catalytic performance for oxygen reduction reaction (ORR), in which mass activity (0.939 A mgPt−1) is much higher (∼500 %) than that of commercial Pt/C (0.187 A mgPt−1), respectively. Furthermore, Pt-Co ND-NF shows enhanced stability during the accelerated durability tests (ADTs) for 50,000 cycles. Pt-Co nanodendrites in nanoframe with Pt skin, create a novel protection with an external nanoframe (NF) and obtain a unique catalytic material Pt-Co ND-NF, which could provide promising ways for highly strengthening catalytic activity.

ACS Style

Xinxin Zhu; Lei Huang; Min Wei; Panagiotis Tsiakaras; Pei Kang Shen. Highly stable Pt-Co nanodendrite in nanoframe with Pt skin structured catalyst for oxygen reduction electrocatalysis. Applied Catalysis B: Environmental 2020, 281, 119460 .

AMA Style

Xinxin Zhu, Lei Huang, Min Wei, Panagiotis Tsiakaras, Pei Kang Shen. Highly stable Pt-Co nanodendrite in nanoframe with Pt skin structured catalyst for oxygen reduction electrocatalysis. Applied Catalysis B: Environmental. 2020; 281 ():119460.

Chicago/Turabian Style

Xinxin Zhu; Lei Huang; Min Wei; Panagiotis Tsiakaras; Pei Kang Shen. 2020. "Highly stable Pt-Co nanodendrite in nanoframe with Pt skin structured catalyst for oxygen reduction electrocatalysis." Applied Catalysis B: Environmental 281, no. : 119460.

Research article
Published: 11 August 2020 in ACS Applied Materials & Interfaces
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Developing high performance bifunctional transition metal catalysts would be significantly beneficial for electrocatalytic oxidation of urea-rich wastewater. Herein, we synthesize a V2O3 nanosheet anchored N-doped-carbon encapsulated Ni heterostructure ([email protected]–V2O3/NF) for the reactions of urea oxidation (UOR) and hydrogen evolution (HER). Electrochemical results indicate that it exhibits small potentials of 1.32, 1.39, and 1.43 V for UOR and low overpotentials of 36, 254, and 355 mV for HER at ±10, ± 500 and ±1000 mA cm–2, respectively. It can work at 100 mA cm–2 for over 72 h as cathode and anode electrode without obvious attenuation, suggesting an outstanding durability. The reason for this behavior could be ascribed to the N-doped-carbon coating structure, the synergetic effects between Ni and V2O3, and the nano/micro nanosheets architecture self-supported on nickel foam. This work could provide a promising, inexpensive, and green method for the degradation of urea-rich wastewater and hydrogen production.

ACS Style

Guangfu Qian; Jinli Chen; Lin Luo; Hao Zhang; Wei Chen; Zhejiang Gao; Shibin Yin; Panagiotis Tsiakaras. Novel Bifunctional V2O3 Nanosheets Coupled with N-Doped-Carbon Encapsulated Ni Heterostructure for Enhanced Electrocatalytic Oxidation of Urea-Rich Wastewater. ACS Applied Materials & Interfaces 2020, 12, 38061 -38069.

AMA Style

Guangfu Qian, Jinli Chen, Lin Luo, Hao Zhang, Wei Chen, Zhejiang Gao, Shibin Yin, Panagiotis Tsiakaras. Novel Bifunctional V2O3 Nanosheets Coupled with N-Doped-Carbon Encapsulated Ni Heterostructure for Enhanced Electrocatalytic Oxidation of Urea-Rich Wastewater. ACS Applied Materials & Interfaces. 2020; 12 (34):38061-38069.

Chicago/Turabian Style

Guangfu Qian; Jinli Chen; Lin Luo; Hao Zhang; Wei Chen; Zhejiang Gao; Shibin Yin; Panagiotis Tsiakaras. 2020. "Novel Bifunctional V2O3 Nanosheets Coupled with N-Doped-Carbon Encapsulated Ni Heterostructure for Enhanced Electrocatalytic Oxidation of Urea-Rich Wastewater." ACS Applied Materials & Interfaces 12, no. 34: 38061-38069.

Research article
Published: 24 June 2020 in Industrial & Engineering Chemistry Research
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A copper magnetite nanohybrid catalyst (Cu-Fe3O4/Cu/C), abundant of Schottky interfaces and structural defects, with ultrathin encapsulation of graphitic carbon, was synthesized and tested. The catalyst shows enhanced catalytic activity, far higher than the single and mixed counterparts toward ultrasonic-assisted heterogeneous Fenton degradation of rhodamine-B, exhibiting a reaction rate constant of 0.146 min–1 much larger than that over carbon-encapsulated Cu (Cu/C, 0.010 min–1) and over Fe3O4 (Fe3O4/C, 0.009 min–1). Besides, the catalyst also delivers good reusability, showing less than 7% decrease of removal efficiency even after four cycles. As evidenced by the electron paramagnetic resonance spectra and high-resolution transmission electron microscopy, the Schottky interface between Cu and Fe3O4 endows the catalyst with a good electron donor feature and significantly boosts the formation of ·OH and ·O2– radicals, and the conductive encapsulation layer and the abundant structural defects accelerate charge-transfer process in Fe3O4, which together contribute to the impressive increase of the degradation rate.

ACS Style

Juan Xiao; Junhang Lai; Ruchun Li; Xiang Fang; Dongfang Zhang; Panagiotis Tsiakaras; Yi Wang. Enhanced Ultrasonic-Assisted Heterogeneous Fenton Degradation of Organic Pollutants over a New Copper Magnetite (Cu-Fe3O4/Cu/C) Nanohybrid Catalyst. Industrial & Engineering Chemistry Research 2020, 59, 12431 -12440.

AMA Style

Juan Xiao, Junhang Lai, Ruchun Li, Xiang Fang, Dongfang Zhang, Panagiotis Tsiakaras, Yi Wang. Enhanced Ultrasonic-Assisted Heterogeneous Fenton Degradation of Organic Pollutants over a New Copper Magnetite (Cu-Fe3O4/Cu/C) Nanohybrid Catalyst. Industrial & Engineering Chemistry Research. 2020; 59 (27):12431-12440.

Chicago/Turabian Style

Juan Xiao; Junhang Lai; Ruchun Li; Xiang Fang; Dongfang Zhang; Panagiotis Tsiakaras; Yi Wang. 2020. "Enhanced Ultrasonic-Assisted Heterogeneous Fenton Degradation of Organic Pollutants over a New Copper Magnetite (Cu-Fe3O4/Cu/C) Nanohybrid Catalyst." Industrial & Engineering Chemistry Research 59, no. 27: 12431-12440.

Journal article
Published: 17 June 2020 in Applied Catalysis B: Environmental
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Herein, resulting from the heterojunction engineering, poly-terthiophene (pTTh) hybridized CuOxnanoparticles (abbreviated as [email protected]) are firstly synthesized and adopted as a promising photoelectrocatalyst for phenol degradation in wastewater. The resultant [email protected] manifests outstanding light-harvesting ability and remarkable capacity to separate photo-generated electron-hole pairs for phenol degradation in aqueous solution. X-ray photoelectron (XPS) characterizations and theoretical calculations further identify that there exists a strong electronic interaction between CuOx nanoparticles and pTTh, further enhancing the charge carriers transfer dynamics of the as-prepared catalysts. Electron spin resonance (ESR) spectroscopy and high performance liquid chromatography (HPLC) are applied to explore the active species and the degradation mechanism of photoelectrocatalyis (PEC) reactions. It is found that in PEC degradation of phenol the main active species are ·O2− and ·OH. Also, it can be concluded that phenol can eventually be step by step oxidized to CO2 and H2O through different pathways, according to the different detected intermediates.

ACS Style

Zhuohua Mo; Kun Wang; Hao Yang; Zuqiao Ou; Yexiang Tong; Tongwen Yu; Yi Wang; Panagiotis Tsiakaras; Shuqin Song. Heterojunction architecture of pTTh nanoflowers with CuOx nanoparticles hybridized for efficient photoelectrocatalytic degradation of organic pollutants. Applied Catalysis B: Environmental 2020, 277, 119249 .

AMA Style

Zhuohua Mo, Kun Wang, Hao Yang, Zuqiao Ou, Yexiang Tong, Tongwen Yu, Yi Wang, Panagiotis Tsiakaras, Shuqin Song. Heterojunction architecture of pTTh nanoflowers with CuOx nanoparticles hybridized for efficient photoelectrocatalytic degradation of organic pollutants. Applied Catalysis B: Environmental. 2020; 277 ():119249.

Chicago/Turabian Style

Zhuohua Mo; Kun Wang; Hao Yang; Zuqiao Ou; Yexiang Tong; Tongwen Yu; Yi Wang; Panagiotis Tsiakaras; Shuqin Song. 2020. "Heterojunction architecture of pTTh nanoflowers with CuOx nanoparticles hybridized for efficient photoelectrocatalytic degradation of organic pollutants." Applied Catalysis B: Environmental 277, no. : 119249.

Research article
Published: 30 April 2020 in ACS Sustainable Chemistry & Engineering
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In order to provide solutions for the pollution caused by nitrogen-containing wastewater and the shortage of fossil fuels, it is urgent to design highly performing bifunctional catalysts for the urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). Herein, asok-like Ni-NiO-Mo0.84Ni0.16/NF hybrids are synthesized via hydrothermal and calcination methods. They exhibit superior catalytic activities for UOR (1.33 V at 50 mA cm–2), higher than the ever-reported NiMo-based catalysts, and for HER (0.069 V at 50 mA cm–2). Furthermore, the decline in catalytic performance is negligible after operating for 60 h at 250 mA cm–2. We suppose that the reason could be attributed to the special asok-like structure, a self-supported structure formed with 3D nickel foam (NF) and the three-phase hybrids. This work proposes a new strategy for the preparation of asok-like NiMo-based cost-effective catalysts, highly performing for both nitrogen-containing wastewater treatment and large-scale H2 production.

ACS Style

Qinglian Xu; Guangfu Qian; Shibin Yin; Chen Yu; Wei Chen; Tianqi Yu; Lin Luo; Yijiang Xia; Panagiotis Tsiakaras. Design and Synthesis of Highly Performing Bifunctional Ni-NiO-MoNi Hybrid Catalysts for Enhanced Urea Oxidation and Hydrogen Evolution Reactions. ACS Sustainable Chemistry & Engineering 2020, 8, 7174 -7181.

AMA Style

Qinglian Xu, Guangfu Qian, Shibin Yin, Chen Yu, Wei Chen, Tianqi Yu, Lin Luo, Yijiang Xia, Panagiotis Tsiakaras. Design and Synthesis of Highly Performing Bifunctional Ni-NiO-MoNi Hybrid Catalysts for Enhanced Urea Oxidation and Hydrogen Evolution Reactions. ACS Sustainable Chemistry & Engineering. 2020; 8 (18):7174-7181.

Chicago/Turabian Style

Qinglian Xu; Guangfu Qian; Shibin Yin; Chen Yu; Wei Chen; Tianqi Yu; Lin Luo; Yijiang Xia; Panagiotis Tsiakaras. 2020. "Design and Synthesis of Highly Performing Bifunctional Ni-NiO-MoNi Hybrid Catalysts for Enhanced Urea Oxidation and Hydrogen Evolution Reactions." ACS Sustainable Chemistry & Engineering 8, no. 18: 7174-7181.

Journal article
Published: 02 April 2020 in Journal of Electroanalytical Chemistry
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Transition metal phosphides (TMPs) are considered as promising electrode materials due to their superior electrical conductivity and excellent redox activity. However, TMPs have rarely been reported as catalysts for lithium air batteries. In the present work, three-dimensional (3D) self-standing [email protected]/BC (BC = biochar) electrode is fabricated by the initial deposition of Prussian blue analogues (PBA) on biomass and the subsequent one-step phosphating process with red phosphorous as the phosphorous source. The as-prepared electrode is directly applied as the cathode for Li-O2 batteries, which delivers good electrochemical performance, such as high specific capacity of 10.9 mAh g−1cathode at a current density of 0.05 mA cm−2, good rate capability, and long cycle life of >90 cycles. The rational design of this 3D self-standing cathode integrates the advantages of efficient electron transport network of biochar and sufficient accessible reaction sites of TMP catalysts.

ACS Style

Huagen Liang; Xu Gong; Linhui Jia; Fu Chen; Zhonghao Rao; Shengyu Jing; Panagiotis Tsiakaras. Highly efficient Li-O2 batteries based on self-standing [email protected]/BC cathode derived from biochar supported Prussian blue analogues. Journal of Electroanalytical Chemistry 2020, 867, 114124 .

AMA Style

Huagen Liang, Xu Gong, Linhui Jia, Fu Chen, Zhonghao Rao, Shengyu Jing, Panagiotis Tsiakaras. Highly efficient Li-O2 batteries based on self-standing [email protected]/BC cathode derived from biochar supported Prussian blue analogues. Journal of Electroanalytical Chemistry. 2020; 867 ():114124.

Chicago/Turabian Style

Huagen Liang; Xu Gong; Linhui Jia; Fu Chen; Zhonghao Rao; Shengyu Jing; Panagiotis Tsiakaras. 2020. "Highly efficient Li-O2 batteries based on self-standing [email protected]/BC cathode derived from biochar supported Prussian blue analogues." Journal of Electroanalytical Chemistry 867, no. : 114124.

Journal article
Published: 21 March 2020 in Applied Catalysis B: Environmental
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Electrocatalytic nitrogen reduction offers a vital approach for nitrogen fixation in a green and sustainable way, but the low solubility of nitrogen and the competitive hydrogen evolution reaction still impede its further development. Inspired by the structure of gas-trapping hydrophobic hair on a subaquatic spider and the function of hemocyanin in its blood, in the present work, an aerophilic-hydrophilic heterostructured electrode is constructed by using aerophilic ultrathin porous Bi5O7I nanotubes and hydrophilic carbon spheres. Besides, the electrolyte is functionalized with suspended ultrathin porous Bi5O7I nanotubes. The Faradaic efficiency is increased from 5.19 % to 13.42 %, and the ammonia yield is boosted from 7.96 to 31.46 mg h−1m-2 by the new way at -0.4 V versus reversible hydrogen electrode under ambient conditions. Furthermore, the highest yield rate of 85.45 mg h−1 m-2 is achieved with a configured flow cell. This work presents a promising biomimetic strategy to boost electrocatalytic N2 fixation proceed from electrode and electrolyte.

ACS Style

Yang Liu; Bingmei Huang; Xingfa Chen; Zhiqun Tian; Xinyi Zhang; Panagiotis Tsiakaras; Pei Kang Shen. Electrocatalytic production of ammonia: Biomimetic electrode–electrolyte design for efficient electrocatalytic nitrogen fixation under ambient conditions. Applied Catalysis B: Environmental 2020, 271, 118919 .

AMA Style

Yang Liu, Bingmei Huang, Xingfa Chen, Zhiqun Tian, Xinyi Zhang, Panagiotis Tsiakaras, Pei Kang Shen. Electrocatalytic production of ammonia: Biomimetic electrode–electrolyte design for efficient electrocatalytic nitrogen fixation under ambient conditions. Applied Catalysis B: Environmental. 2020; 271 ():118919.

Chicago/Turabian Style

Yang Liu; Bingmei Huang; Xingfa Chen; Zhiqun Tian; Xinyi Zhang; Panagiotis Tsiakaras; Pei Kang Shen. 2020. "Electrocatalytic production of ammonia: Biomimetic electrode–electrolyte design for efficient electrocatalytic nitrogen fixation under ambient conditions." Applied Catalysis B: Environmental 271, no. : 118919.

Journal article
Published: 17 March 2020 in Sensors and Actuators B: Chemical
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The present investigation describes the results of the performance and the assessment of a combined electrochemical oxygen sensor, equipped with a diffusion barrier and consisted of an electrochemical cell-pump and a potentiometric cell. Both cells of the oxygen sensor are based on the same solid electrolyte, having 0.91ZrO2 + 0.09 Y2O3 composition. More precisely, the sensor consists of: i) an electrochemical cell served for electrochemically pumping-out of oxygen from the sensor chamber, operating as an amperometric sensor and ii) a second electrochemical cell served for measuring the oxygen content in the sensor chamber and operating in potentiometric mode. The analyzed gas is used as the test gas for the second cell, operating under potentiometric regime. The second cell allows studying the sensor’s internal oxygen content as well. The presence of the potentiometric cell increases the reliability of the sensor due to simultaneous measurement of the values of the limiting current in the cell-pump and of the electromotive force in the potentiometric cell. The as fabricated sensor is found to be very effective, providing rapid and accurate response for gas mixtures containing within the range of minimal to nearly 90% (0,8–88%) oxygen concentrations at operating temperature values between 400–700 °C. The sensor response time at 500 °C does not exceed the 60 s. The sensor allows measuring the oxygen diffusion coefficient in nitrogen in a wide range of high temperature values as well.

ACS Style

A Kalyakin; A. Demin; E. Gorbova; A. Volkov; P. Tsiakaras. Combined amperometric-potentiometric oxygen sensor. Sensors and Actuators B: Chemical 2020, 313, 127999 .

AMA Style

A Kalyakin, A. Demin, E. Gorbova, A. Volkov, P. Tsiakaras. Combined amperometric-potentiometric oxygen sensor. Sensors and Actuators B: Chemical. 2020; 313 ():127999.

Chicago/Turabian Style

A Kalyakin; A. Demin; E. Gorbova; A. Volkov; P. Tsiakaras. 2020. "Combined amperometric-potentiometric oxygen sensor." Sensors and Actuators B: Chemical 313, no. : 127999.

Journal article
Published: 09 March 2020 in Renewable Energy
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Among the exfoliation processes applied on layered materials, it is the first time to explore the ultrasonic exfoliation in water for improving the catalytic properties of NiFe2O4/CB (CB = carbon black) nanospheres towards the electrocatalytic hydrogen evolution reaction (HER) in acidic media. It is found that after exfoliation, the overpotential of HER on NiFe2O4/CB nanospheres is improved by about 90 mV at a current density of 10 mA cm−2. Moreover, the exfoliated NiFe2O4/CB nanospheres are not only more stable than the commercial Pt/C catalyst, but also they exhibit an overpotential improvement of about 100 mV at 50 mA cm−2, after 6000 CV cycles. It is also found that the ultrasonic process causes uniformed NiFe2O4/CB particles, an increase of the electrochemical active sites, enriched Fe2+ ion and Fe3+ occupied on tetrahedral sites on the surface layer of the NiFe2O4/CB nanospheres, as resulted from the analysis with XPS, FTIR etc., leading to a higher activity and excellent durability. Furthermore, the approach also provides new insights on processing of materials in a green route.

ACS Style

Tshimangadzo S. Munonde; Haitao Zheng; Mphoma S. Matseke; Philiswa Nosizo Nomngongo; Yi Wang; Panagiotis Tsiakaras. A green approach for enhancing the electrocatalytic activity and stability of NiFe2O4/CB nanospheres towards hydrogen production. Renewable Energy 2020, 154, 704 -714.

AMA Style

Tshimangadzo S. Munonde, Haitao Zheng, Mphoma S. Matseke, Philiswa Nosizo Nomngongo, Yi Wang, Panagiotis Tsiakaras. A green approach for enhancing the electrocatalytic activity and stability of NiFe2O4/CB nanospheres towards hydrogen production. Renewable Energy. 2020; 154 ():704-714.

Chicago/Turabian Style

Tshimangadzo S. Munonde; Haitao Zheng; Mphoma S. Matseke; Philiswa Nosizo Nomngongo; Yi Wang; Panagiotis Tsiakaras. 2020. "A green approach for enhancing the electrocatalytic activity and stability of NiFe2O4/CB nanospheres towards hydrogen production." Renewable Energy 154, no. : 704-714.

Review article
Published: 25 December 2019 in Applied Catalysis B: Environmental
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This review summarizes the current advances of hetero-doped (Fe, Co, P, S, N) nanostructures derived from MOFs (metal-organic frameworks) for the oxygen reduction reaction (ORR) electrocatalysis. These nanomaterials are classified as: 0D (polyhedrons, hollow and core-shell structures), 1D (nanotubes and nanorods), 2D (nanosheets), and 3D (honeycomb like frameworks) morphologies. It is thoroughly discussed the critical and very important pathway of ORR, which occurs in electrochemical devices such as fuel cells and metal-air batteries (high energy capacity, excellent conversion efficiency and low environmental impact). Emphasis is given on the mechanistic studies devoted to both the nanostructure formation from MOFs and the morphology-activity relationship of transition-metal anchored carbon nanostructures transformed from MOFs. Controlled electronic structures, extrinsic/intrinsic structures and interface (edge) properties are also discussed for the ORR performance, providing a useful preparation approach for carbon doped with heteroatoms by rationally designing MOF precursors. As a result of the ongoing flexibility of these frameworks, the doped carbon based electrocatalysts present enhanced ORR performance, which expands their applications (except for fuel cells) in other energy conversion and storage devices like supercapacitors and metal ion batteries.

ACS Style

Syed Shoaib Ahmad Shah; Tayyaba Najam; Muhammad Kashif Aslam; Muhammad Ashfaq; Mohammed Rahman; Kun Wang; Panagiotis Tsiakaras; Shuqin Song; Yi Wang. Recent advances on oxygen reduction electrocatalysis: Correlating the characteristic properties of metal organic frameworks and the derived nanomaterials. Applied Catalysis B: Environmental 2019, 268, 118570 .

AMA Style

Syed Shoaib Ahmad Shah, Tayyaba Najam, Muhammad Kashif Aslam, Muhammad Ashfaq, Mohammed Rahman, Kun Wang, Panagiotis Tsiakaras, Shuqin Song, Yi Wang. Recent advances on oxygen reduction electrocatalysis: Correlating the characteristic properties of metal organic frameworks and the derived nanomaterials. Applied Catalysis B: Environmental. 2019; 268 ():118570.

Chicago/Turabian Style

Syed Shoaib Ahmad Shah; Tayyaba Najam; Muhammad Kashif Aslam; Muhammad Ashfaq; Mohammed Rahman; Kun Wang; Panagiotis Tsiakaras; Shuqin Song; Yi Wang. 2019. "Recent advances on oxygen reduction electrocatalysis: Correlating the characteristic properties of metal organic frameworks and the derived nanomaterials." Applied Catalysis B: Environmental 268, no. : 118570.