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Dr. Xiaolei Wang
Department of Chemical and Materials Engineering, Faculty of Engineering and Computer Science, Concordia University, 1455 De Maisonneuve Blvd. West, Montreal, Quebec H3G 1M8, Canada

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Research Keywords & Expertise

0 Clean Energy Technologies
0 Electrocatalysis
0 Electrochemistry
0 water splitting
0 Advanced Energy Materials

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water splitting
Clean Energy Technologies
Electrocatalysis
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Research article
Published: 09 July 2021 in Advanced Functional Materials
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Lithium metal anodes hold great potential for next-generation high-energy batteries. However, the low Coulombic efficiency (CE) and dendritic growth during lithium metal plating/stripping cause short cycle life and deter its practical application. Herein, nitrogen, oxygen-codoped vertical carbon nanosheet arrays are constructed on Cu foil ([email protected]) as the efficient host to improve CE and suppress Li dendrites through polymer interfacial self-assembly and morphology-preserved pyrolysis. Benefitting from numerous vertical porous channels with abundant lithiophilic heteroatom dopants, 3D structured [email protected] host can guide Li nucleation and growth in a controlled manner, leading to dendrite-free Li deposition with high CE and long life cycles in both carbonate electrolyte and ether electrolyte, surpassing horizontal carbon-coated Cu and pure Cu hosts. Finite element simulation further reveals the structural function of vertical carbon arrays as not only directing Li plating in the nanoarray-constructed confined space but also homogenizing the distribution of ion concentration and electrical field throughout the 3D electrode. To demonstrate the practical application of lithiated [email protected] anode, it is coupled with a commercial LiFePO4 cathode, delivering high capacity and long-cycle stability with nearly 100% CE. The cost-effective, scalable, and efficient features render [email protected] a promising Li host toward practical lithium metal batteries.

ACS Style

Zhixiao Xu; Luyao Xu; Zhixin Xu; Zhiping Deng; Xiaolei Wang. N, O‐Codoped Carbon Nanosheet Array Enabling Stable Lithium Metal Anode. Advanced Functional Materials 2021, 2102354 .

AMA Style

Zhixiao Xu, Luyao Xu, Zhixin Xu, Zhiping Deng, Xiaolei Wang. N, O‐Codoped Carbon Nanosheet Array Enabling Stable Lithium Metal Anode. Advanced Functional Materials. 2021; ():2102354.

Chicago/Turabian Style

Zhixiao Xu; Luyao Xu; Zhixin Xu; Zhiping Deng; Xiaolei Wang. 2021. "N, O‐Codoped Carbon Nanosheet Array Enabling Stable Lithium Metal Anode." Advanced Functional Materials , no. : 2102354.

Journal article
Published: 19 June 2021 in Journal of Energy Chemistry
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Highly active and durable electrocatalysts towards oxygen reduction reaction (ORR) are imperative for the commercialization application of proton exchange membrane fuel cells. By manipulating ligand effect, structural control, and strain effect, we report here the precise preparation of Mo-doped Pt3Co alloy nanowires (Pt3Co-Mo NWs) as the efficient catalyst towards ORR with high specific activity (0.596 mA cm−2) and mass activity (MA, 0.84 A mg−1Pt), much higher than those of undoped counterparts. Besides activity, Pt3Co-Mo NWs also demonstrate excellent structural stability and cyclic durability even after 50,000 cycles, again surpassing control samples without Mo dopants. According to the strain maps and DFT calculations, Mo dopants could modify the electronic structure of both Pt and Co to achieve not only optimized oxygen-intermediate binding energy on the interface but also increased the vacancy formation energy of Co, together leading to enhanced activity and durability. This work provides not only a facile methodology but also an in-depth investigation of the relationship between structure and properties to provide general guidance for future design and optimization.

ACS Style

Zhiping Deng; Wanying Pang; Mingxing Gong; Zhehui Jin; Xiaolei Wang. Revealing the role of mo doping in promoting oxygen reduction reaction performance of Pt3Co nanowires. Journal of Energy Chemistry 2021, 66, 16 -23.

AMA Style

Zhiping Deng, Wanying Pang, Mingxing Gong, Zhehui Jin, Xiaolei Wang. Revealing the role of mo doping in promoting oxygen reduction reaction performance of Pt3Co nanowires. Journal of Energy Chemistry. 2021; 66 ():16-23.

Chicago/Turabian Style

Zhiping Deng; Wanying Pang; Mingxing Gong; Zhehui Jin; Xiaolei Wang. 2021. "Revealing the role of mo doping in promoting oxygen reduction reaction performance of Pt3Co nanowires." Journal of Energy Chemistry 66, no. : 16-23.

Research article
Published: 17 April 2021 in ENERGY & ENVIRONMENTAL MATERIALS
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Lean electrolyte usage in lithium sulfur battery (LSB) meets the demand of the high energy density. However, lean condition makes the electrolyte‐related interface discrete, leading to retardation of ion transfer that depends on interfaces. Consequently, electrochemical reactions face restraint. Herein, Lithium polyacrylate acid (LiPAA) with short‐chain anions (molecular weight of 2000) is introduced into the cathode. Because of the PS‐philic instinct of the short‐chain PAA anions, short‐chain polysulfide (PS) is captured inside of the cathode. In addition, LiPAA supplies Li+ to the short‐chain PS captured. The strong interaction between Li2S4 and the LiPAA effectively decrease Li2S4 migration to the anode during discharging. In a sense, the ion mass transfer pattern is thus changed comparing to traditional long‐way mode between cathode and anode. Galvanostatic intermittent titration technique (GITT) proves that the interfacial reaction resistance is greatly decreased in the region where Li2Sx (x≤4) reduction contributes most. In the same time, the reversibility of electrochemical reduction/oxidation is improved. Owing to the accelerated Li2Sx (x≤4) reduction, Li implanting of only 0.3 wt.% plus O introduction up to 1.4 wt.% enables the LSB performs well even with 1/4 of regular electrolyte dosage (5 μL mg‐1) and high‐sulfur loading (4.2 mg cm‐2), increasing its rate capacity C0.8/0.5 from 52.6% (without the LiPAA) to 92.3% (with the LiPAA) as well as a capacity of 518.7 mAh g‐1 after 400 cycles at 0.8 mA cm‐2.

ACS Style

Jizong Zhang; Mingming Chen; Yu Si; Jian Guo; Tianli Wu; Chengyang Wang; Xiaolei Wang. LiPAA with Short‐chain Anion Facilitating Li 2 S x ( x ≤ 4) Reduction in Lean‐electrolyte Lithium–sulfur Battery. ENERGY & ENVIRONMENTAL MATERIALS 2021, 1 .

AMA Style

Jizong Zhang, Mingming Chen, Yu Si, Jian Guo, Tianli Wu, Chengyang Wang, Xiaolei Wang. LiPAA with Short‐chain Anion Facilitating Li 2 S x ( x ≤ 4) Reduction in Lean‐electrolyte Lithium–sulfur Battery. ENERGY & ENVIRONMENTAL MATERIALS. 2021; ():1.

Chicago/Turabian Style

Jizong Zhang; Mingming Chen; Yu Si; Jian Guo; Tianli Wu; Chengyang Wang; Xiaolei Wang. 2021. "LiPAA with Short‐chain Anion Facilitating Li 2 S x ( x ≤ 4) Reduction in Lean‐electrolyte Lithium–sulfur Battery." ENERGY & ENVIRONMENTAL MATERIALS , no. : 1.

Journal article
Published: 24 March 2021 in Applied Catalysis B: Environmental
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Scalable synthesis of active, durable, low-cost, and self-supported electrodes assembled by electrocatalysts towards hydrogen and oxygen generation reactions for water electrolyzers remains a grand challenge. We develop here a facile fabrication of nickel-molybdenum carbide heterostructures embedded in large-area (100 cm2) hierarchically assembled nitrogen-enriched carbon, forming Mott-Schottky array on nickel foam (Ni-Mo2C/[email protected]). The Ni-Mo2C/NC array is directly applied as the bifunctional catalyst with high activity and durability in alkaline electrolyte. Particularly, an extremely low overpotential of 40 mV is needed to generate hydrogen. Density functional theory calculation revealed that the formation of Ni-Mo2C Mott //nitrogen-doped carbon Schottky interfaces enables favorable electronic structures for electrocatalytic water splitting. Besides, 3D hierarchical structure provides exposed active sites, facilitates mass and charge transfer, graphitic shells enhance stability. A symmetric electrolyzer using Ni-Mo2C/[email protected] generates 10 mA cm−2 at 1.59 V and operates steadily for 150 h, which even outperforms the noble metal couple, Pt/C//RuO2 for water electrolysis. The scalability, activity and durability renders Ni-Mo2C/[email protected] potential industrial application. The assembly-carburization strategy could be further applied for preparing Co-Mo2C/[email protected] and Cu-Mo2C/[email protected]

ACS Style

Zhixiao Xu; Song Jin; Min Ho Seo; Xiaolei Wang. Hierarchical Ni-Mo2C/N-doped carbon Mott-Schottky array for water electrolysis. Applied Catalysis B: Environmental 2021, 292, 120168 .

AMA Style

Zhixiao Xu, Song Jin, Min Ho Seo, Xiaolei Wang. Hierarchical Ni-Mo2C/N-doped carbon Mott-Schottky array for water electrolysis. Applied Catalysis B: Environmental. 2021; 292 ():120168.

Chicago/Turabian Style

Zhixiao Xu; Song Jin; Min Ho Seo; Xiaolei Wang. 2021. "Hierarchical Ni-Mo2C/N-doped carbon Mott-Schottky array for water electrolysis." Applied Catalysis B: Environmental 292, no. : 120168.

Journal article
Published: 21 March 2021 in Journal of Power Sources
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3D petal-like Co3O4 nanosheets with the mesoporous structure are produced successfully and coated firmly on carbon fibers by simply electrodepositing cobaltous acetate tetrahydrate and its subsequent calcination. The morphology of the precursor, which dominates the structure of the final product, evolves from layers of moss-like amorphous cobalt compounds to Co3O4 nanosheets with obvious lattice defects. Compared with Co3O4 nanoparticles synthesized by the traditional hydrothermal method, the nanosheet layered structure has a higher specific surface area and more active sites. The 3D Co3O4 nanosheets are further used as modification materials to fabricate electrodes with excellent electrocatalytic activity and good reversibility towards both the positive and negative vanadium redox reactions. With the Co3O4 nanosheets modified electrodes, the battery demonstrates remarkably improved performance and shows excellent long-term stability with a dischargeable capacity decay rate of only 2.9 mAh per cycle, which is 70% lower than that of the battery with unmodified electrodes.

ACS Style

Dongjiang You; Jingyuan Lou; Xiaoqiang Li; Yanli Zhou; Xueqin Sun; Xiaolei Wang. Investigation of advanced catalytic effect of Co3O4 nanosheets modified carbon felts as vanadium flow battery electrodes. Journal of Power Sources 2021, 494, 229775 .

AMA Style

Dongjiang You, Jingyuan Lou, Xiaoqiang Li, Yanli Zhou, Xueqin Sun, Xiaolei Wang. Investigation of advanced catalytic effect of Co3O4 nanosheets modified carbon felts as vanadium flow battery electrodes. Journal of Power Sources. 2021; 494 ():229775.

Chicago/Turabian Style

Dongjiang You; Jingyuan Lou; Xiaoqiang Li; Yanli Zhou; Xueqin Sun; Xiaolei Wang. 2021. "Investigation of advanced catalytic effect of Co3O4 nanosheets modified carbon felts as vanadium flow battery electrodes." Journal of Power Sources 494, no. : 229775.

Review article
Published: 13 March 2021 in Electrochemical Energy Reviews
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Increasing concerns over climate change and energy shortage have driven the development of clean energy devices such as batteries, supercapacitors, fuel cells and solar water splitting in the past decades. And among potential device materials, 3D hierarchical carbon-rich micro-/nanomaterials (3D HCMNs) have come under intense scrutiny because they can prevent the stacking and bundling of low-dimensional building blocks to not only shorten diffusion distances for matter and charge to achieve high-energy-high-power storage but also greatly expose active sites to achieve highly active, durable and efficient catalysis. Based on this, this review will summarize the synthetic strategies and formation mechanisms of 3D HCMNs, including 3D nanocarbons, polymers, COFs/MOFs, templated carbons and derived carbon-based hybrids with a focus on 3D superstructures such as urchins, flowers, hierarchical tubular structures as well as nanoarrays including nanotube, nanofiber and nanosheet arrays. This review will also discuss the application of 3D HCMNs in energy storage and catalysis systems, including batteries, supercapacitors, electrocatalysis and photo(electro)catalysis. Overall, this review will provide a comprehensive overview of the recent progress of 3D HCMNs in terms of preparation strategies, formation mechanisms, structural diversities and electrochemical applications to provide a guideline for the rational design and structure–function exploration of 3D hierarchical nanomaterials from different sources beyond carbon-based species.

ACS Style

Zhixiao Xu; Wenjing Deng; Xiaolei Wang. 3D Hierarchical Carbon-Rich Micro-/Nanomaterials for Energy Storage and Catalysis. Electrochemical Energy Reviews 2021, 4, 269 -335.

AMA Style

Zhixiao Xu, Wenjing Deng, Xiaolei Wang. 3D Hierarchical Carbon-Rich Micro-/Nanomaterials for Energy Storage and Catalysis. Electrochemical Energy Reviews. 2021; 4 (2):269-335.

Chicago/Turabian Style

Zhixiao Xu; Wenjing Deng; Xiaolei Wang. 2021. "3D Hierarchical Carbon-Rich Micro-/Nanomaterials for Energy Storage and Catalysis." Electrochemical Energy Reviews 4, no. 2: 269-335.

Full article
Published: 23 February 2021 in Electrochemical Science Advances
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Lithium‐ion batteries are the predominant energy storage devices for portable electronic devices and hold great promise for renewable energies and sustainability. High capacity and long‐life anode materials are highly desired for the next‐generation Li‐ion battery with high energy density. Herein, a high‐performance anode electrode constructed with cobalt and zinc sulfides nanocrystals embedded within a nitrogen and sulfur co‐doped porous carbon is successfully designed bimetal‐organic frameworks as the precursor. Benefiting from synergistic effects of bimetal sulfides, the unique rhombohedral dodecahedral nanostructure with rough surface area and N,S‐codoped carbon matrix, such an anode material presents superior initial reversible capacity of 938.2 mA h g−1 with a high‐capacity retention of 65.6% after 100 cycles at 150 mA/g. The effective nanostructure design is expected to open a venue to construct high‐performance materials for energy and environment applications.

ACS Style

Lu Chen; Zhi Chen; Xudong Liu; Zhibin Ye; Xiaolei Wang. N,S‐Codoped hollow carbon dodecahedron/sulfides composites enabling high‐performance lithium‐ion intercalation. Electrochemical Science Advances 2021, e2100001 .

AMA Style

Lu Chen, Zhi Chen, Xudong Liu, Zhibin Ye, Xiaolei Wang. N,S‐Codoped hollow carbon dodecahedron/sulfides composites enabling high‐performance lithium‐ion intercalation. Electrochemical Science Advances. 2021; ():e2100001.

Chicago/Turabian Style

Lu Chen; Zhi Chen; Xudong Liu; Zhibin Ye; Xiaolei Wang. 2021. "N,S‐Codoped hollow carbon dodecahedron/sulfides composites enabling high‐performance lithium‐ion intercalation." Electrochemical Science Advances , no. : e2100001.

Review article
Published: 10 January 2021 in Nano Energy
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Lithium-sulfur batteries (LSBs) have been of paramount interest due to their high specific energy, environmental benignity, and low-cost production as a promising candidate among the next generation of rechargeable batteries. Even they represent one of the most mature battery systems, the high discharging capacity and stable long cycling performance cannot be fully realized, especially under practical conditions, which hamper their entrance to the energy storage market in the near future. Solutions to unsolved issues that arise during the complex and multiphase conversion-type chemistry involved in LSBs are still being researched, including irreversible relocation of polysulfides, slow reaction kinetics, and low reliability of lithium anode. Achieving a scientific understanding of the current challenges toward the individual components in cells and the existing status of research strategies is vitally important to the development of LSBs. In this critical review, we attempt to summarize our current comprehension in this field, analyze and classify possible strategies to address the main concerns in the research on LSBs, and introduce design pathways for the further improvement of LSBs toward practical applications. Advanced methodology toward the synthesis of desirable host materials of the electrode with encapsulation effect via nanostructured design; the tailorable adsorption and catalysis property; chemical confinements function by covalent linking; modification of electronic structure, heteroatom doping, and defects are overviewed and highlighted. Methods for regulating salt anions, solvents, auxiliary additives in electrolytes, and the constructions of interlayers toward deployable separator and anode enabling interfacial protection; the establishment of novel electrode fabrication and functional batteries assembly systems technologies are discussed for the further development of viable LSBs. The strategies and perspectives outlined in this review will provide further research directions and help to achieve the aim of exploring high-performance LSBs technology with high energy density and long cycling stability.

ACS Style

Wenjing Deng; Jason Phung; Ge Li; Xiaolei Wang. Realizing high-performance lithium-sulfur batteries via rational design and engineering strategies. Nano Energy 2021, 82, 105761 .

AMA Style

Wenjing Deng, Jason Phung, Ge Li, Xiaolei Wang. Realizing high-performance lithium-sulfur batteries via rational design and engineering strategies. Nano Energy. 2021; 82 ():105761.

Chicago/Turabian Style

Wenjing Deng; Jason Phung; Ge Li; Xiaolei Wang. 2021. "Realizing high-performance lithium-sulfur batteries via rational design and engineering strategies." Nano Energy 82, no. : 105761.

Research article
Published: 23 November 2020 in Nano Research
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Rational design and development of cost-effective, highly active and durable bifunctional electrocatalysts towards oxygen redox reactions is of critical importance but great challenge for the broad implementation of next-generation metal-air batteries for electric transportation. Herein, a high-performance electrocatalyst of cobalt and zinc sulfides nanocrystals embedded within nitrogen and sulfur co-doped porous carbon is successfully designed and derived from bimetallic metal-organic frameworks of cobalt and zinc containing zeolitic imidazolate frameworks. The unique nanostructure contains abundant electrocatalytic active sites of sulfides nanocrystals and nitrogen and sulfur dopants which can be fast accessed through highly porous structure originate from both zinc vaporization and sulfurization processes. Such bifunctional electrocatalyst delivers a superior half-wave potential of 0.86 V towards oxygen reduction reaction and overpotential of 350 mV towards oxygen evolution reaction, as well as excellent durability owing to the highly stable carbon framework with a great graphitized portion. The performance boosting is mainly attributed to the unique nanostructure where bimetallic cobalt and zinc provide synergistic effect during both synthesis and catalysis processes. The design and realization pave a new way of development and understanding of bifunctional electrocatalyst towards clean electrochemical energy technologies.

ACS Style

Lu Chen; Zhi Chen; Xudong Liu; Xiaolei Wang. Bimetallic metal-organic framework derived doped carbon nanostructures as high-performance electrocatalyst towards oxygen reactions. Nano Research 2020, 14, 1533 -1540.

AMA Style

Lu Chen, Zhi Chen, Xudong Liu, Xiaolei Wang. Bimetallic metal-organic framework derived doped carbon nanostructures as high-performance electrocatalyst towards oxygen reactions. Nano Research. 2020; 14 (5):1533-1540.

Chicago/Turabian Style

Lu Chen; Zhi Chen; Xudong Liu; Xiaolei Wang. 2020. "Bimetallic metal-organic framework derived doped carbon nanostructures as high-performance electrocatalyst towards oxygen reactions." Nano Research 14, no. 5: 1533-1540.

Paper
Published: 24 July 2020 in RSC Advances
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The catalyst is assembled from small nanoparticles in the shape of a bayberry, and exhibits superior trifunctional electrocatalytic activity.

ACS Style

Qing Zhang; Wenjie Han; Zhixiao Xu; Yinling Li; Lu Chen; Zhengyu Bai; Lin Yang; Xiaolei Wang. Hollow waxberry-like cobalt–nickel oxide/S,N-codoped carbon nanospheres as a trifunctional electrocatalyst for OER, ORR, and HER. RSC Advances 2020, 10, 27788 -27793.

AMA Style

Qing Zhang, Wenjie Han, Zhixiao Xu, Yinling Li, Lu Chen, Zhengyu Bai, Lin Yang, Xiaolei Wang. Hollow waxberry-like cobalt–nickel oxide/S,N-codoped carbon nanospheres as a trifunctional electrocatalyst for OER, ORR, and HER. RSC Advances. 2020; 10 (46):27788-27793.

Chicago/Turabian Style

Qing Zhang; Wenjie Han; Zhixiao Xu; Yinling Li; Lu Chen; Zhengyu Bai; Lin Yang; Xiaolei Wang. 2020. "Hollow waxberry-like cobalt–nickel oxide/S,N-codoped carbon nanospheres as a trifunctional electrocatalyst for OER, ORR, and HER." RSC Advances 10, no. 46: 27788-27793.

Journal article
Published: 01 May 2020 in ECS Meeting Abstracts
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ACS Style

Xiaolei Wang. Hierarchical Carbon Nanosheet Arrays for Lithium Metal Batteries and Electrochemical Water Splitting. ECS Meeting Abstracts 2020, MA2020-01, 595 -595.

AMA Style

Xiaolei Wang. Hierarchical Carbon Nanosheet Arrays for Lithium Metal Batteries and Electrochemical Water Splitting. ECS Meeting Abstracts. 2020; MA2020-01 (5):595-595.

Chicago/Turabian Style

Xiaolei Wang. 2020. "Hierarchical Carbon Nanosheet Arrays for Lithium Metal Batteries and Electrochemical Water Splitting." ECS Meeting Abstracts MA2020-01, no. 5: 595-595.

Research article
Published: 21 January 2020 in ACS Applied Nano Materials
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Electrocatalysts for oxygen reactions play a vital role in the applications of energy conversion devices, such as fuel cells, water splitting and metal-air batteries. Developing novel non-precious bifunctional electrocatalysts is particularly essential for improved-performance metal-air batteries by overcoming sluggish oxygen reactions. Herein, we demonstrate a composite electrocatalyst with bimetallic CoNi alloy nanocrystals embedded within nitrogen-doped highly graphitic carbon spheres (N-CoNi/PCS). Owing to the efficient design strategy, such composite electrocatalyst exhibits a unique pomegranate-like morphology and microstructure. When applied to alkaline electrolyte system, the porous electrocatalyst delivers a low half-wave potential of 0.80 V towards ORR and overpotential of 540 mV towards OER with excellent durability. The high performance is systematically studied and ascribed to the unique nanoarchitecture which enables fast ion transportation and electron transfer, easy access to abundant active sites, and robustness. This work forwards the field of fabricating high active, affordable and stable bifunctional electrocatalyst for energy conversion.

ACS Style

Lu Chen; Zhixiao Xu; Wenjie Han; Qing Zhang; Zhengyu Bai; Zhi Chen; Ge Li; Xiaolei Wang. Bimetallic CoNi Alloy Nanoparticles Embedded in Pomegranate-like Nitrogen-Doped Carbon Spheres for Electrocatalytic Oxygen Reduction and Evolution. ACS Applied Nano Materials 2020, 3, 1354 -1362.

AMA Style

Lu Chen, Zhixiao Xu, Wenjie Han, Qing Zhang, Zhengyu Bai, Zhi Chen, Ge Li, Xiaolei Wang. Bimetallic CoNi Alloy Nanoparticles Embedded in Pomegranate-like Nitrogen-Doped Carbon Spheres for Electrocatalytic Oxygen Reduction and Evolution. ACS Applied Nano Materials. 2020; 3 (2):1354-1362.

Chicago/Turabian Style

Lu Chen; Zhixiao Xu; Wenjie Han; Qing Zhang; Zhengyu Bai; Zhi Chen; Ge Li; Xiaolei Wang. 2020. "Bimetallic CoNi Alloy Nanoparticles Embedded in Pomegranate-like Nitrogen-Doped Carbon Spheres for Electrocatalytic Oxygen Reduction and Evolution." ACS Applied Nano Materials 3, no. 2: 1354-1362.

Rapid communication
Published: 05 January 2020 in ACS Sustainable Chemistry & Engineering
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Uniquely nanostructured CuCo2O4 is presented as an electrocatalyst for oxygen evolution reactions (OER). CuCo2O4 particles in a chestnut-burr-like shape (CCO*, where ∗ = chestnut burr) were hydrothermally synthesized around fibers of Ni foam substrates as current collectors. Chestnut burrs 4 μm on average had thorns consisting of less than five threads. Each thread was made of a consecutive array of nanobeads less than 10 nm. Nanovoids or nanopores were found between nanobeads. The chestnut-burr structure of CCO* allowed IrO2-overwhelming OER activity. By using the hierarchically nanostructured electrocatalyst directly grown on current collectors without binders and conducting agents, high performances of anion exchange membrane (AEM) electrolysis was demonstrated. Three merits of the electrode architecture were emphasized. First, mass transfer pathways for reactants and products were secured in a microscale between thorns and in a nanoscale between nanobeads. Second, more active sites were exposed to electrolytes in the hierarchical structure. Third, direct growth of active materials on conductive substrates improved adhesion and electrical conduction.

ACS Style

Yoo Sei Park; Myeong Je Jang; Jaehoon Jeong; Sung Min Park; Xiaolei Wang; Min Ho Seo; Sung Mook Choi; Juchan Yang. Hierarchical Chestnut-Burr Like Structure of Copper Cobalt Oxide Electrocatalyst Directly Grown on Ni Foam for Anion Exchange Membrane Water Electrolysis. ACS Sustainable Chemistry & Engineering 2020, 8, 2344 -2349.

AMA Style

Yoo Sei Park, Myeong Je Jang, Jaehoon Jeong, Sung Min Park, Xiaolei Wang, Min Ho Seo, Sung Mook Choi, Juchan Yang. Hierarchical Chestnut-Burr Like Structure of Copper Cobalt Oxide Electrocatalyst Directly Grown on Ni Foam for Anion Exchange Membrane Water Electrolysis. ACS Sustainable Chemistry & Engineering. 2020; 8 (6):2344-2349.

Chicago/Turabian Style

Yoo Sei Park; Myeong Je Jang; Jaehoon Jeong; Sung Min Park; Xiaolei Wang; Min Ho Seo; Sung Mook Choi; Juchan Yang. 2020. "Hierarchical Chestnut-Burr Like Structure of Copper Cobalt Oxide Electrocatalyst Directly Grown on Ni Foam for Anion Exchange Membrane Water Electrolysis." ACS Sustainable Chemistry & Engineering 8, no. 6: 2344-2349.

Full paper
Published: 28 March 2019 in ChemistrySelect
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Hard carbon shows a promising application for sodium storage but suffers from low electrochemical stability, which leads to poor rate capacity and cycle life. Here, we report a heteroatom‐doping hard/soft carbon hybrid prepared by easy oxidizing acid treatment and low temperature catalytic graphitization. The heteroatoms increase the sodium‐ion adsorption capability during slope region, showing an important contribution at high current. Besides, the introduction of oriented domains enhances the conductivity, as well as the heteroatom doping, and electrochemical stability of hard/soft carbon hybrids. What's more, these structure characteristics also benefit the stable storage of sodium ions, supported by a 74% increase in terms of reversible capacity. Thus, the electrochemical performance retains a fast and reversible capacity of 125 mAh⋅g−1 at high current density of 8 C.

ACS Style

Xu Liu; Youyu Zhu; Na Liu; Mingming Chen; Chengyang Wang; Xiaolei Wang. Catalytic Synthesis of Hard/Soft Carbon Hybrids with Heteroatom Doping for Enhanced Sodium Storage. ChemistrySelect 2019, 4, 3551 -3558.

AMA Style

Xu Liu, Youyu Zhu, Na Liu, Mingming Chen, Chengyang Wang, Xiaolei Wang. Catalytic Synthesis of Hard/Soft Carbon Hybrids with Heteroatom Doping for Enhanced Sodium Storage. ChemistrySelect. 2019; 4 (12):3551-3558.

Chicago/Turabian Style

Xu Liu; Youyu Zhu; Na Liu; Mingming Chen; Chengyang Wang; Xiaolei Wang. 2019. "Catalytic Synthesis of Hard/Soft Carbon Hybrids with Heteroatom Doping for Enhanced Sodium Storage." ChemistrySelect 4, no. 12: 3551-3558.

Review
Published: 07 February 2019 in Fuel Processing Technology
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Microwave-assisted pyrolysis is considered a promising technique for the thermochemical conversion of solid waste such as sewage sludge to useful energy products, including bio-char, bio-oil and bio-gas. However, a limited number of reports are found on the fundamentals and application of this process to extend the high potential of microwave-assisted pyrolysis of sewage sludge. This article presents up-to-date knowledge regarding important aspects of sewage sludge microwave pyrolysis, starting with the pretreatment of sewage sludge and the latest studies of conventional and microwave pyrolysis heating. This article further explores the products generated by microwave-assisted pyrolysis for sewage sludge including composition and yield. For instance, recent progress in experimental studies of both the catalytic and non-catalytic microwave-assisted pyrolysis of sewage sludge are reviewed and their results are analyzed in comparison to the product distributions resulting from non-microwave heating methods. Finally, this review discusses both the advantages and challenges of sewage sludge pyrolysis using microwave heating and the milestones that are necessary to be obtained in the future.

ACS Style

Ali Zaker; Zhi Chen; Xiaolei Wang; Qiang Zhang. Microwave-assisted pyrolysis of sewage sludge: A review. Fuel Processing Technology 2019, 187, 84 -104.

AMA Style

Ali Zaker, Zhi Chen, Xiaolei Wang, Qiang Zhang. Microwave-assisted pyrolysis of sewage sludge: A review. Fuel Processing Technology. 2019; 187 ():84-104.

Chicago/Turabian Style

Ali Zaker; Zhi Chen; Xiaolei Wang; Qiang Zhang. 2019. "Microwave-assisted pyrolysis of sewage sludge: A review." Fuel Processing Technology 187, no. : 84-104.

Journal article
Published: 01 December 2018 in Applied Catalysis B: Environmental
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ACS Style

Min Ho Seo; Moon Gyu Park; Dong Un Lee; Xiaolei Wang; Wook Ahn; Seung Hyo Noh; Sung Mook Choi; Zachary P. Cano; Byungchan Han; Zhongwei Chen. Bifunctionally active and durable hierarchically porous transition metal-based hybrid electrocatalyst for rechargeable metal-air batteries. Applied Catalysis B: Environmental 2018, 239, 677 -687.

AMA Style

Min Ho Seo, Moon Gyu Park, Dong Un Lee, Xiaolei Wang, Wook Ahn, Seung Hyo Noh, Sung Mook Choi, Zachary P. Cano, Byungchan Han, Zhongwei Chen. Bifunctionally active and durable hierarchically porous transition metal-based hybrid electrocatalyst for rechargeable metal-air batteries. Applied Catalysis B: Environmental. 2018; 239 ():677-687.

Chicago/Turabian Style

Min Ho Seo; Moon Gyu Park; Dong Un Lee; Xiaolei Wang; Wook Ahn; Seung Hyo Noh; Sung Mook Choi; Zachary P. Cano; Byungchan Han; Zhongwei Chen. 2018. "Bifunctionally active and durable hierarchically porous transition metal-based hybrid electrocatalyst for rechargeable metal-air batteries." Applied Catalysis B: Environmental 239, no. : 677-687.

Journal article
Published: 26 October 2018 in Nano Energy
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Herein, a unique nitrogen-doped T-Nb2O5/tubular carbon hybrid structure in which T-Nb2O5 nanoparticles are homogeneously embedded in an in-situ formed nitrogen-doped microtubular carbon is synthesized, utilizing a facile and innovative synthesis strategy. This structure addresses the poor electron conductivity and rate capability that hinder T-Nb2O5's promise as an anode for Li-ion devices. Such a distinctive structure possesses a robust framework that has ultrasmall active nanocomponents encapsulated in highly conductive carbon scaffold with hollow interior and abundant voids, enabling fast electron/ion transport and electrolyte penetration. Moreover, nitrogen-doping not only ameliorates the electronic conductivity of the heterostructure, but also induces pseudocapacitance mechanism. When evaluated in a half-cell, the as-prepared material delivers a specific capacitance of 370 F g-1 at 0.1 A g-1 within 1–3 V vs. Li/Li+ and excellent cyclability over 1100 cycles. A high energy density of 86.6 W h kg-1 and high power density of 6.09 kW kg-1 are realized. Additionally, a capacitance retention as high as 81% after 3500 cycles is achieved in an Li-ion Capacitor (LIC) with activated carbon as the cathode and nitrogen-doped T-Nb2O5/tubular carbon as the anode.

ACS Style

Sahar Hemmati; Ge Li; Xiaolei Wang; Yuanli Ding; Yu Pei; Aiping Yu; Zhongwei Chen. 3D N-doped hybrid architectures assembled from 0D T-Nb2O5 embedded in carbon microtubes toward high-rate Li-ion capacitors. Nano Energy 2018, 56, 118 -126.

AMA Style

Sahar Hemmati, Ge Li, Xiaolei Wang, Yuanli Ding, Yu Pei, Aiping Yu, Zhongwei Chen. 3D N-doped hybrid architectures assembled from 0D T-Nb2O5 embedded in carbon microtubes toward high-rate Li-ion capacitors. Nano Energy. 2018; 56 ():118-126.

Chicago/Turabian Style

Sahar Hemmati; Ge Li; Xiaolei Wang; Yuanli Ding; Yu Pei; Aiping Yu; Zhongwei Chen. 2018. "3D N-doped hybrid architectures assembled from 0D T-Nb2O5 embedded in carbon microtubes toward high-rate Li-ion capacitors." Nano Energy 56, no. : 118-126.

Research article
Published: 16 February 2018 in ACS Catalysis
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Large-sized two-dimensional phosphorus-doped carbon nanosheets (2D-PPCN) with tunable porosity were synthesized via a multifunctional templating method. A single inexpensive solid precursor, phosphorus pentoxide, is combined with common saccharides in a stepwise multiple templating process for 2D construction, phosphorus doping, and regulated micro-/mesopore creation. This reliable 2D porous carbon production technique can potentially be utilized in a variety of energy storage and conversion fields. The effects of different porous structures on the electrocatalytic activity of 2D-PPCN based electrocatalysts are specifically investigated in this work. The interconnected open-pore system and high specific surface area result in a high catalytic efficiency for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). When integrated into an air-breathing cathode for rechargeable Zn-air batteries, the best-performing 2D-PPCN demonstrates better cell performance than a noble metal benchmark catalyst and a higher durability with over 1000 charge–discharge cycles.

ACS Style

Wen Lei; Ya-Ping Deng; Gaoran Li; Zachary P. Cano; Xiaolei Wang; Dan Luo; Yangshuai Liu; Deli Wang; Zhongwei Chen. Two-Dimensional Phosphorus-Doped Carbon Nanosheets with Tunable Porosity for Oxygen Reactions in Zinc-Air Batteries. ACS Catalysis 2018, 8, 2464 -2472.

AMA Style

Wen Lei, Ya-Ping Deng, Gaoran Li, Zachary P. Cano, Xiaolei Wang, Dan Luo, Yangshuai Liu, Deli Wang, Zhongwei Chen. Two-Dimensional Phosphorus-Doped Carbon Nanosheets with Tunable Porosity for Oxygen Reactions in Zinc-Air Batteries. ACS Catalysis. 2018; 8 (3):2464-2472.

Chicago/Turabian Style

Wen Lei; Ya-Ping Deng; Gaoran Li; Zachary P. Cano; Xiaolei Wang; Dan Luo; Yangshuai Liu; Deli Wang; Zhongwei Chen. 2018. "Two-Dimensional Phosphorus-Doped Carbon Nanosheets with Tunable Porosity for Oxygen Reactions in Zinc-Air Batteries." ACS Catalysis 8, no. 3: 2464-2472.

Research article
Published: 07 November 2017 in ACS Nano
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Multishelled hollow structured transition metal oxides (TMOs) are highly potential materials for high energy density energy storage due to their high volumetric energy density, reduced aggregation of nanosized subunits, and excellent capacity and durability. However, traditional synthetic methods of TMOs generally require complicated steps and lack compositional/morphological adjustability. Herein, a general and straightforward strategy is developed to synthesize multishelled porous hollow microspheres, which is constituted of nanosize primary TMO particles, using metal acetate polysaccharide microspheres as the precursor. This universal method can be applied to design TMOs’ hollow spheres with tunable shell numbers and composition. The hierarchical porous quadruple-shelled hollow microspheres with nanosized Ni–Co–Mn oxide demonstrate an increased number of active sites, boosted rate capability, enhanced volumetric energy density, and showed great tolerance toward volume expansion upon cycling, thus exhibiting excellent Li+ storage capability with high specific capacity (1470 mAh g–1 at 0.2 A g–1 and 1073.6 mAh g–1 at 5.0 A g–1) and excellent cycle retention (1097 mAh g–1 after 250 cycles at 0.2 A g–1) among TMO anode materials for lithium-ion batteries.

ACS Style

Dan Luo; Ya-Ping Deng; Xiaolei Wang; Gaoran Li; Juan Wu; Jing Fu; Wen Lei; Ruilin Liang; Yangshuai Liu; Yuanli Ding; Aiping Yu; Zhongwei Chen. Tuning Shell Numbers of Transition Metal Oxide Hollow Microspheres toward Durable and Superior Lithium Storage. ACS Nano 2017, 11, 11521 -11530.

AMA Style

Dan Luo, Ya-Ping Deng, Xiaolei Wang, Gaoran Li, Juan Wu, Jing Fu, Wen Lei, Ruilin Liang, Yangshuai Liu, Yuanli Ding, Aiping Yu, Zhongwei Chen. Tuning Shell Numbers of Transition Metal Oxide Hollow Microspheres toward Durable and Superior Lithium Storage. ACS Nano. 2017; 11 (11):11521-11530.

Chicago/Turabian Style

Dan Luo; Ya-Ping Deng; Xiaolei Wang; Gaoran Li; Juan Wu; Jing Fu; Wen Lei; Ruilin Liang; Yangshuai Liu; Yuanli Ding; Aiping Yu; Zhongwei Chen. 2017. "Tuning Shell Numbers of Transition Metal Oxide Hollow Microspheres toward Durable and Superior Lithium Storage." ACS Nano 11, no. 11: 11521-11530.

Full paper
Published: 04 September 2017 in Advanced Functional Materials
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Sodium‐ion batteries (SIBs) are regarded as the best alternative to lithium‐ion batteries due to their low cost and similar Na+ insertion chemistry. It is still challenging but greatly desired to design and develop novel electrode materials with high reversible capacity, long cycling life, and good rate capability toward high‐performance SIBs. This work demonstrates an innovative design strategy and a development of few‐layered molybdenum disulfide/sulfur‐doped graphene nanosheets (MoS2/SG) composites as the SIB anode material providing a high specific capacity of 587 mA h g−1 calculated based on the total composite mass and an extremely long cycling stability over 1000 cycles at a current density of 1.0 A g−1 with a high capacity retention of ≈85%. Systematic characterizations reveal that the outstanding performance is mainly attributed to the unique and robust composite architecture where few‐layered MoS2 and S‐doped graphene are intimately bridged at the hetero‐interface through a synergistic coupling effect via the covalently doped S atoms. The design strategy and mechanism understanding at the molecular level outlined here can be readily applied to other layered transition metal oxides for SIBs anode and play a key role in contributing to the development of high‐performance SIBs.

ACS Style

Ge Li; Dan Luo; Xiaolei Wang; Min Ho Seo; Sahar Hemmati; Aiping Yu; Zhongwei Chen. Enhanced Reversible Sodium-Ion Intercalation by Synergistic Coupling of Few-Layered MoS2and S-Doped Graphene. Advanced Functional Materials 2017, 27, 1 .

AMA Style

Ge Li, Dan Luo, Xiaolei Wang, Min Ho Seo, Sahar Hemmati, Aiping Yu, Zhongwei Chen. Enhanced Reversible Sodium-Ion Intercalation by Synergistic Coupling of Few-Layered MoS2and S-Doped Graphene. Advanced Functional Materials. 2017; 27 (40):1.

Chicago/Turabian Style

Ge Li; Dan Luo; Xiaolei Wang; Min Ho Seo; Sahar Hemmati; Aiping Yu; Zhongwei Chen. 2017. "Enhanced Reversible Sodium-Ion Intercalation by Synergistic Coupling of Few-Layered MoS2and S-Doped Graphene." Advanced Functional Materials 27, no. 40: 1.