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Dr. Deepak Dubal
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, O Block, Level 4, Room O-406, Gardens Point Campus, Brisbane QLD 4001, Australia

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0 Hybrids
0 Nanomaterials
0 Supercapacitors
0 wearable electronics
0 Li-ion Batteries

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Journal article
Published: 04 June 2021 in Electrochimica Acta
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Potassium-ion capacitor (KICs) is an emerging technology that can potentially combines the virtue of high power capability of supercapacitors and high energy density of batteries. Herein, we have scientifically transformed blue denim textile waste into two different forms of nanocarbons to assemble dual carbon potassium-ion hybrid capacitor (KIHC). The unique composition of indigo and sulphur dyes in blue jeans enables to produce multi-heteroatom (nitrogen, sulphur and oxygen) doped hard carbon (MHC) with large interlayer spacing (0.41 nm) in a single step. An in-situ transmission electron microscopy (TEM) analysis reveal that the charge stored in disordered and large interlayer spaced graphitic structure enable fast kinetics for efficient potassium-ion transportation. Coupling with an activated carbon foam (ACF)-based cathode, a full cell of potassium-ion capacitor successfully delivers a high energy density of 181 Wh kg−1, at 70.4 W kg−1 and 61.8 Wh kg−1 at 4000 W kg−1, as well as an long lifespan of 5,000 cycles with over 89% of capacity retention. These performance statistics match or exceed state-of-the-art values for KIHCs, providing novel strategy to develop dual carbon ion capacitors with high energy and high power capabilities.

ACS Style

Hong Duc Pham; Joseph F.S. Fernando; Michael Horn; Jennifer MacLeod; Nunzio Motta; William O. S. Doherty; Alice Payne; Ashok Kumar Nanjundan; Dmitri Golberg; Deepak Dubal. Multi-heteroatom doped nanocarbons for high performance double carbon potassium ion capacitor. Electrochimica Acta 2021, 389, 138717 .

AMA Style

Hong Duc Pham, Joseph F.S. Fernando, Michael Horn, Jennifer MacLeod, Nunzio Motta, William O. S. Doherty, Alice Payne, Ashok Kumar Nanjundan, Dmitri Golberg, Deepak Dubal. Multi-heteroatom doped nanocarbons for high performance double carbon potassium ion capacitor. Electrochimica Acta. 2021; 389 ():138717.

Chicago/Turabian Style

Hong Duc Pham; Joseph F.S. Fernando; Michael Horn; Jennifer MacLeod; Nunzio Motta; William O. S. Doherty; Alice Payne; Ashok Kumar Nanjundan; Dmitri Golberg; Deepak Dubal. 2021. "Multi-heteroatom doped nanocarbons for high performance double carbon potassium ion capacitor." Electrochimica Acta 389, no. : 138717.

Review article
Published: 25 May 2021 in The Journal of Physical Chemistry Letters
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Supercapacitors (SCs) are considered promising energy storage systems because of their high power output and long-term cycling stability; however, they usually exhibit poor energy density. The hybrid supercapacitor (HSC) is an emerging concept in which two dissimilar electrodes with different charge storage mechanisms are paired to deliver high energy without sacrificing power output. This Perspective highlights the features of transition-metal phosphides (TMPs) as the positive electrode in HSCs. In particular, bimetallic nickel cobalt phosphide (NiCoP) with multiple redox sites, excellent electrochemical reversibility, and stability is discussed. We outline how the rational heterostructures, elemental variations, and nanocomposite morphologies tune the electrochemical properties of NiCoP as the positive electrode in HSCs. The Perspective further sheds light on NiCoP-based composites that help in improving the overall performance of HSCs in terms of energy density and cycling stability. The key scientific challenges and perspectives on building efficient and stable HSCs for future applications are discussed.

ACS Style

Sk Tarik Aziz; Sushil Kumar; Sk Riyajuddin; Kaushik Ghosh; Gilbert Daniel Nessim; Deepak P. Dubal. Bimetallic Phosphides for Hybrid Supercapacitors. The Journal of Physical Chemistry Letters 2021, 12, 5138 -5149.

AMA Style

Sk Tarik Aziz, Sushil Kumar, Sk Riyajuddin, Kaushik Ghosh, Gilbert Daniel Nessim, Deepak P. Dubal. Bimetallic Phosphides for Hybrid Supercapacitors. The Journal of Physical Chemistry Letters. 2021; 12 (21):5138-5149.

Chicago/Turabian Style

Sk Tarik Aziz; Sushil Kumar; Sk Riyajuddin; Kaushik Ghosh; Gilbert Daniel Nessim; Deepak P. Dubal. 2021. "Bimetallic Phosphides for Hybrid Supercapacitors." The Journal of Physical Chemistry Letters 12, no. 21: 5138-5149.

Review
Published: 21 May 2021 in Small
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Nickel chalcogenide (S and Se) based nanostructures intrigued scientists for some time as materials for energy conversion and storage systems. Interest in these materials is due to their good electrochemical stability, eco-friendly nature, and low cost. The present review compiles recent progress in the area of nickel-(S and Se)-based materials by providing a comprehensive summary of their structural and chemical features and performance. Improving properties of the materials, such as electrical conductivity and surface characteristics (surface area and morphology), through strategies like nano-structuring and hybridization, are systematically discussed. The interaction of the materials with electrolytes, other electro-active materials, and inactive components are analyzed to understand their effects on the performance of energy conversion and storage devices. Finally, outstanding challenges and possible solutions are briefly presented with some perspectives toward the future development of these materials for energy-oriented devices with high performance.

ACS Style

Oshnik Maurya; Somnath Khaladkar; Michael R. Horn; Bhavesh Sinha; Rajendra Deshmukh; Hongxia Wang; Taeyoung Kim; Deepak P. Dubal; Archana Kalekar. Emergence of Ni‐Based Chalcogenides (S and Se) for Clean Energy Conversion and Storage. Small 2021, 17, 2100361 .

AMA Style

Oshnik Maurya, Somnath Khaladkar, Michael R. Horn, Bhavesh Sinha, Rajendra Deshmukh, Hongxia Wang, Taeyoung Kim, Deepak P. Dubal, Archana Kalekar. Emergence of Ni‐Based Chalcogenides (S and Se) for Clean Energy Conversion and Storage. Small. 2021; 17 (33):2100361.

Chicago/Turabian Style

Oshnik Maurya; Somnath Khaladkar; Michael R. Horn; Bhavesh Sinha; Rajendra Deshmukh; Hongxia Wang; Taeyoung Kim; Deepak P. Dubal; Archana Kalekar. 2021. "Emergence of Ni‐Based Chalcogenides (S and Se) for Clean Energy Conversion and Storage." Small 17, no. 33: 2100361.

Journal article
Published: 14 April 2021 in Energy Storage Materials
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Herein, a solution-free dry strategy for the growth of self-assembled ordered tricopper phosphide (Cu3P) nanorod arrays is developed and the product is employed as a high-energy, stable positive electrode for a solid-state hybrid supercapacitor (HSC). The ordered Cu3P nanorod arrays grown on the copper foam deliver an excellent specific capacity of 664 mA h/g with an energy efficiency of 88% at 6 A/g and an ultra-long cycling stability over 15,000 continuous charge–discharge cycles. These electrochemical features are attributed to the ordered growth of the Cu3P nanorod arrays, which offers a large number of accessible electroactive sites, a reduced number of ion transfer paths, and reversible redox activity. The potential of the Cu3P nanorod arrays is further explored by engineering solid-state HSCs in which the nanorods are paired with an activated carbon-based negative electrode. The constructed cell is shown to convey a specific energy of 76.85 Wh/kg at a specific power of 1,125 W/kg and an 88% capacitance retention over 15,000 cycles. Moreover, the superior energy storing and delivery capacity of the cell is demonstrated by an energy efficiency of around 65%. The versatile solution-free dry strategies developed here pave the way towards engineering a range of electrode materials for next-generation energy storage systems.

ACS Style

Nilesh R. Chodankar; Pragati A. Shinde; Swati J. Patil; Seung-Kyu Hwang; Ganji Seeta Rama Raju; Kugalur Shanmugam Ranjith; Deepak P. Dubal; Yun Suk Huh; Young-Kyu Han. Solution-free self-assembled growth of ordered tricopper phosphide for efficient and stable hybrid supercapacitor. Energy Storage Materials 2021, 39, 194 -202.

AMA Style

Nilesh R. Chodankar, Pragati A. Shinde, Swati J. Patil, Seung-Kyu Hwang, Ganji Seeta Rama Raju, Kugalur Shanmugam Ranjith, Deepak P. Dubal, Yun Suk Huh, Young-Kyu Han. Solution-free self-assembled growth of ordered tricopper phosphide for efficient and stable hybrid supercapacitor. Energy Storage Materials. 2021; 39 ():194-202.

Chicago/Turabian Style

Nilesh R. Chodankar; Pragati A. Shinde; Swati J. Patil; Seung-Kyu Hwang; Ganji Seeta Rama Raju; Kugalur Shanmugam Ranjith; Deepak P. Dubal; Yun Suk Huh; Young-Kyu Han. 2021. "Solution-free self-assembled growth of ordered tricopper phosphide for efficient and stable hybrid supercapacitor." Energy Storage Materials 39, no. : 194-202.

Paper
Published: 08 April 2021 in Journal of Materials Chemistry A
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An hybrid supercapacitor was fabricated on Co(ii)-TMU-63#30%CoMn2O4 nanocomposites (as the positive electrode) and AC (as the negative electrode), resulting in the high energy density of 38.54 W h kg−1 and power density of 2312.4 W kg−1.

ACS Style

Reza Abazari; Soheila Sanati; Ali Morsali; Deepak P. Dubal. High specific capacitance of a 3D-metal–organic framework-confined growth in CoMn2O4 nanostars as advanced supercapacitor electrode materials. Journal of Materials Chemistry A 2021, 9, 11001 -11012.

AMA Style

Reza Abazari, Soheila Sanati, Ali Morsali, Deepak P. Dubal. High specific capacitance of a 3D-metal–organic framework-confined growth in CoMn2O4 nanostars as advanced supercapacitor electrode materials. Journal of Materials Chemistry A. 2021; 9 (17):11001-11012.

Chicago/Turabian Style

Reza Abazari; Soheila Sanati; Ali Morsali; Deepak P. Dubal. 2021. "High specific capacitance of a 3D-metal–organic framework-confined growth in CoMn2O4 nanostars as advanced supercapacitor electrode materials." Journal of Materials Chemistry A 9, no. 17: 11001-11012.

Research article
Published: 17 March 2021 in Advanced Energy and Sustainability Research
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Potassium‐ion batteries (KIBs) have attracted enormous attention as next‐generation energy storage system due to their low‐cost, fast ionic conductivity within the electrolyte and high operating voltage. However, the developing suitable electrode materials to guarantee high‐energy output and structural stability to ensure long cycling performance remains a critical challenge. Herein, anatase TiO2 nanoparticles were encapsulated in nitrogen‐rich graphitic carbon (TiO 2 @NGC) with hierarchical pores and high surface area (250 m2/g) using the Ti‐based metal‐organic framework NH2‐MIL‐125 (Ti8O8(OH)4(NH2‐bdc)6 as a sacrificial template. Serving as the anode material in a K‐ion half‐cell, TiO 2 @NGC delivered a high capacity of 228 mAh/g with remarkable cycling performance (negligible loss over 2000 cycles with more than 98% Coulombic efficiency). The charge storing mechanism is underpinned using ex‐situ characterization techniques such as ex‐situ X‐ray diffraction (XRD) and SEM analysis. It is revealed that the original TiO2 phase gets transformed to anorthic Ti7O13 and monoclinic K2Ti4O9 phase after the first charge/discharge cycle, which further proceeded the charge storage process via the conversion reactions. These encouraging results further pave the way for designing and developing new hybrid materials as promising electrodes for next‐generation batteries employing abundant raw materials, featuring rapid ion storage and long‐term cycling stability.

ACS Style

Deepak P. Dubal; Andreas Schneemann; Václav Ranc; Štěpán Kment; Ondrej Tomanec; Martin Petr; Hana Kmentova; Michal Otyepka; Radek Zbořil; Roland A. Fischer; Kolleboyina Jayaramulu. Ultrafine TiO 2 Nanoparticle Supported Nitrogen‐Rich Graphitic Porous Carbon as an Efficient Anode Material for Potassium‐Ion Batteries. Advanced Energy and Sustainability Research 2021, 2100042 .

AMA Style

Deepak P. Dubal, Andreas Schneemann, Václav Ranc, Štěpán Kment, Ondrej Tomanec, Martin Petr, Hana Kmentova, Michal Otyepka, Radek Zbořil, Roland A. Fischer, Kolleboyina Jayaramulu. Ultrafine TiO 2 Nanoparticle Supported Nitrogen‐Rich Graphitic Porous Carbon as an Efficient Anode Material for Potassium‐Ion Batteries. Advanced Energy and Sustainability Research. 2021; ():2100042.

Chicago/Turabian Style

Deepak P. Dubal; Andreas Schneemann; Václav Ranc; Štěpán Kment; Ondrej Tomanec; Martin Petr; Hana Kmentova; Michal Otyepka; Radek Zbořil; Roland A. Fischer; Kolleboyina Jayaramulu. 2021. "Ultrafine TiO 2 Nanoparticle Supported Nitrogen‐Rich Graphitic Porous Carbon as an Efficient Anode Material for Potassium‐Ion Batteries." Advanced Energy and Sustainability Research , no. : 2100042.

Review article
Published: 09 March 2021 in Resources, Conservation and Recycling
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The ever-increasing demand for green and clean energy urge the development of cheap and efficient electrode materials for supercapacitors (SCs). In this context, several naturally abundant bio-wastes have been explored to develop porous carbons for SCs due to their easy availability, high performances, and simple processing methods. Although various BDCs are utilized for SC, the relation between the bio-waste precursor and resultant carbon materials are not very well understood. Here, we highlight how the different bio-waste precursors affect the surface characteristics of the carbon nanostructures and outlined their subsequent effect on electrochemical performances. Moreover, the surface modification of carbon materials using pre-processing, carbonization and activation methods is provided. The supercapacitive properties of activated carbons (AC) with their unique surface features derived from the different feedstock are systematically summarized. Finally, the challenges and future directions for the development of AC from bio-waste are discussed. Overall, this review provides a guide to understand how best to refine and carbonize this biomass to achieve optimum supercapacitive performance.

ACS Style

Shashank Sundriyal; Vishal Shrivastav; Hong Duc Pham; Sunita Mishra; Akash Deep; Deepak P. Dubal. Advances in bio-waste derived activated carbon for supercapacitors: Trends, challenges and prospective. Resources, Conservation and Recycling 2021, 169, 105548 .

AMA Style

Shashank Sundriyal, Vishal Shrivastav, Hong Duc Pham, Sunita Mishra, Akash Deep, Deepak P. Dubal. Advances in bio-waste derived activated carbon for supercapacitors: Trends, challenges and prospective. Resources, Conservation and Recycling. 2021; 169 ():105548.

Chicago/Turabian Style

Shashank Sundriyal; Vishal Shrivastav; Hong Duc Pham; Sunita Mishra; Akash Deep; Deepak P. Dubal. 2021. "Advances in bio-waste derived activated carbon for supercapacitors: Trends, challenges and prospective." Resources, Conservation and Recycling 169, no. : 105548.

Research article
Published: 01 March 2021 in ACS Omega
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Silicon anodes are considered as promising electrode materials for next-generation high capacity lithium-ion batteries (LIBs). However, the capacity fading due to the large volume changes (∼300%) of silicon particles during the charge–discharge cycles is still a bottleneck. The volume changes of silicon lead to a fracture of the silicon particles, resulting in recurrent formation of a solid electrolyte interface (SEI) layer, leading to poor capacity retention and short cycle life. Nanometer-scaled silicon particles are the favorable anode material to reduce some of the problems related to the volume changes, but problems related to SEI layer formation still need to be addressed. Herein, we address these issues by developing a composite anode material comprising silicon nanoparticles and nanographite. The method developed is simple, cost-efficient, and based on an aerogel process. The electrodes produced by this aerogel fabrication route formed a stable SEI layer and showed high specific capacity and improved cyclability even at high current rates. The capacity retentions were 92 and 72% of the initial specific capacity at the 171st and the 500th cycle, respectively.

ACS Style

Rohan Patil; Manisha Phadatare; Nicklas Blomquist; Jonas Örtegren; Magnus Hummelgård; Jagruti Meshram; Deepak Dubal; Håkan Olin. Highly Stable Cycling of Silicon-Nanographite Aerogel-Based Anode for Lithium-Ion Batteries. ACS Omega 2021, 6, 6600 -6606.

AMA Style

Rohan Patil, Manisha Phadatare, Nicklas Blomquist, Jonas Örtegren, Magnus Hummelgård, Jagruti Meshram, Deepak Dubal, Håkan Olin. Highly Stable Cycling of Silicon-Nanographite Aerogel-Based Anode for Lithium-Ion Batteries. ACS Omega. 2021; 6 (10):6600-6606.

Chicago/Turabian Style

Rohan Patil; Manisha Phadatare; Nicklas Blomquist; Jonas Örtegren; Magnus Hummelgård; Jagruti Meshram; Deepak Dubal; Håkan Olin. 2021. "Highly Stable Cycling of Silicon-Nanographite Aerogel-Based Anode for Lithium-Ion Batteries." ACS Omega 6, no. 10: 6600-6606.

Paper
Published: 09 January 2021 in Dalton Transactions
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We have demonstrated the photocatalytic efficiency of the Ag/[email protected](Fe) composite for the degradation of organic dyes and p-nitrophenol in water.

ACS Style

Vandana P. Viswanathan; K. S. Divya; Deepak P. Dubal; Nayarassery N. Adarsh; Suresh Mathew. Ag/[email protected](Fe) heterojunction ternary composites: towards the photocatalytic degradation of organic pollutants. Dalton Transactions 2021, 50, 2891 -2902.

AMA Style

Vandana P. Viswanathan, K. S. Divya, Deepak P. Dubal, Nayarassery N. Adarsh, Suresh Mathew. Ag/[email protected](Fe) heterojunction ternary composites: towards the photocatalytic degradation of organic pollutants. Dalton Transactions. 2021; 50 (8):2891-2902.

Chicago/Turabian Style

Vandana P. Viswanathan; K. S. Divya; Deepak P. Dubal; Nayarassery N. Adarsh; Suresh Mathew. 2021. "Ag/[email protected](Fe) heterojunction ternary composites: towards the photocatalytic degradation of organic pollutants." Dalton Transactions 50, no. 8: 2891-2902.

Review article
Published: 04 January 2021 in Energy & Environmental Science
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Polyoxometalates as anionic molecular metal oxides clusters with open frameworks and rich redox chemistry have outstanding versatility in energy conversion and storage research.

ACS Style

Michael R. Horn; Amandeep Singh; Suaad Alomari; Sara Goberna-Ferrón; Raúl Benages-Vilau; Nilesh Rajaram Chodankar; Nunzio Motta; Kostya (Ken) Ostrikov; Jennifer MacLeod; Prashant Murlidhar Sonar; Pedro Gomez-Romero; Deepak P. Dubal. Polyoxometalates (POMs): from electroactive clusters to energy materials. Energy & Environmental Science 2021, 14, 1652 -1700.

AMA Style

Michael R. Horn, Amandeep Singh, Suaad Alomari, Sara Goberna-Ferrón, Raúl Benages-Vilau, Nilesh Rajaram Chodankar, Nunzio Motta, Kostya (Ken) Ostrikov, Jennifer MacLeod, Prashant Murlidhar Sonar, Pedro Gomez-Romero, Deepak P. Dubal. Polyoxometalates (POMs): from electroactive clusters to energy materials. Energy & Environmental Science. 2021; 14 (4):1652-1700.

Chicago/Turabian Style

Michael R. Horn; Amandeep Singh; Suaad Alomari; Sara Goberna-Ferrón; Raúl Benages-Vilau; Nilesh Rajaram Chodankar; Nunzio Motta; Kostya (Ken) Ostrikov; Jennifer MacLeod; Prashant Murlidhar Sonar; Pedro Gomez-Romero; Deepak P. Dubal. 2021. "Polyoxometalates (POMs): from electroactive clusters to energy materials." Energy & Environmental Science 14, no. 4: 1652-1700.

Journal article
Published: 16 December 2020 in Coatings
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This study focusses on the synthesis of silver nanoparticles (Ag-nPs) by citrus fruit (Citrus paradisi) peel extract as reductant while using AgNO3 salt as source of silver ions. Successful preparation of biogenic CAg-nPs catalyst was confirmed by turning the colorless reaction mixture to light brown. The appearance of surface Plasmon resonance (SPR) band in UV-Vis spectra further assured the successful fabrication of nPs. Different techniques such as FTIR, TGA and DLS were adopted to characterize the CAg-nPs. CAg-nPs particles were found to excellent catalysts for reduction of Congo red (CR), methylene blue (MB), malachite green (MG), Rhodamine B (RhB) and 4-nitrophenol (4-NP). Reduction of CR was also performed by varying the contents of NaBH4, CR and catalyst to optimize the catalyst activity. The pseudo first order kinetic model was used to explore the value of rate constants for reduction reactions. Results also interpret that the catalytic reduction of dyes followed the Langmuir–Hinshelwood (LH) mechanism. According to the LH mechanism, the CAg-nPs role in catalysis was explained by way of electrons transfer from donor (NaBH4) to acceptor (dyes). Due to reusability and green synthesis of the CAg-nPs catalyst, it can be a promising candidate for the treatment of water sources contaminated with toxic dyes.

ACS Style

Khalida Naseem; Muhammad Zia Ur Rehman; Awais Ahmad; Deepak Dubal; Tahani Saad Algarni. Plant Extract Induced Biogenic Preparation of Silver Nanoparticles and Their Potential as Catalyst for Degradation of Toxic Dyes. Coatings 2020, 10, 1235 .

AMA Style

Khalida Naseem, Muhammad Zia Ur Rehman, Awais Ahmad, Deepak Dubal, Tahani Saad Algarni. Plant Extract Induced Biogenic Preparation of Silver Nanoparticles and Their Potential as Catalyst for Degradation of Toxic Dyes. Coatings. 2020; 10 (12):1235.

Chicago/Turabian Style

Khalida Naseem; Muhammad Zia Ur Rehman; Awais Ahmad; Deepak Dubal; Tahani Saad Algarni. 2020. "Plant Extract Induced Biogenic Preparation of Silver Nanoparticles and Their Potential as Catalyst for Degradation of Toxic Dyes." Coatings 10, no. 12: 1235.

Communication
Published: 04 December 2020 in Advanced Materials
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In this work, the covalent attachment of an amine functionalized metal‐organic framework (UiO‐66‐NH2 = Zr6O4(OH)4(bdc‐NH2)6; bdc‐NH2 = 2‐amino‐1,4‐benzenedicarboxylate) (UiO‐Universitetet i Oslo) to the basal‐plane of carboxylate functionalized graphene (graphene acid = GA) via amide bonds is reported. The resultant [email protected]‐66‐NH2 hybrid displayed a large specific surface area, hierarchical pores and an interconnected conductive network. The electrochemical characterizations demonstrated that the hybrid [email protected]‐66‐NH2 acts as an effective charge storing material with a capacitance of up to 651 F g−1, significantly higher than traditional graphene‐based materials. The results suggest that the amide linkage plays a key role in the formation of a π‐conjugated structure, which facilitates charge transfer and consequently offers good capacitance and cycling stability. Furthermore, to realize the practical feasibility, an asymmetric supercapacitor using a [email protected]‐66‐NH2 positive electrode with Ti3C2TX MXene as the opposing electrode has been constructed. The cell is able to deliver a power density of up to 16 kW kg−1 and an energy density of up to 73 Wh kg−1, which are comparable to several commercial devices such as Pb‐acid and Ni/MH batteries. Under an intermediate level of loading, the device retained 88% of its initial capacitance after 10 000 cycles.

ACS Style

Kolleboyina Jayaramulu; Michael Horn; Andreas Schneemann; Haneesh Saini; Aristides Bakandritsos; Vaclav Ranc; Martin Petr; Vitalie Stavila; Chandrabhas Narayana; Błażej Scheibe; Štěpán Kment; Michal Otyepka; Nunzio Motta; Deepak Dubal; Radek Zbořil; Roland A. Fischer. Covalent Graphene‐MOF Hybrids for High‐Performance Asymmetric Supercapacitors. Advanced Materials 2020, 33, e2004560 .

AMA Style

Kolleboyina Jayaramulu, Michael Horn, Andreas Schneemann, Haneesh Saini, Aristides Bakandritsos, Vaclav Ranc, Martin Petr, Vitalie Stavila, Chandrabhas Narayana, Błażej Scheibe, Štěpán Kment, Michal Otyepka, Nunzio Motta, Deepak Dubal, Radek Zbořil, Roland A. Fischer. Covalent Graphene‐MOF Hybrids for High‐Performance Asymmetric Supercapacitors. Advanced Materials. 2020; 33 (4):e2004560.

Chicago/Turabian Style

Kolleboyina Jayaramulu; Michael Horn; Andreas Schneemann; Haneesh Saini; Aristides Bakandritsos; Vaclav Ranc; Martin Petr; Vitalie Stavila; Chandrabhas Narayana; Błażej Scheibe; Štěpán Kment; Michal Otyepka; Nunzio Motta; Deepak Dubal; Radek Zbořil; Roland A. Fischer. 2020. "Covalent Graphene‐MOF Hybrids for High‐Performance Asymmetric Supercapacitors." Advanced Materials 33, no. 4: e2004560.

Journal article
Published: 22 November 2020 in Energies
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In this study, amorphous manganese oxide (MnO2) nanostructured thin films were synthesized by a simple hydrothermal method. It is well known that the nanostructure plays a crucial role in energy storage applications. Herein, MnO2 nanostructures ranging from plates to flakes were synthesized without the use of any hard or soft templates. The 4+ oxidation state of Mn was confirmed by X-ray photoelectron spectroscopy. The MnO2 nanoflake structure has a specific surface area of 46 m2g−1, which provides it with an excellent rate capability and an exactly rectangular cyclic voltammogram (CV) curve. The MnO2 nanoflake electrode has a high specific capacitance of about 433 Fg−1, an energy density of 60 Whkg−1 at 0.5 mAcm−2, and an excellent cyclic stability of 95% over 1000 CV cycles in 1 M aq. Na2SO4. Kinetics analysis of the charge storage in the nanoflake MnO2 sample shows a 55.6% diffusion-controlled contribution and 44.4% capacitive-controlled contribution to the total current calculated at a scan rate of 100 mVs−1 from the CV curve.

ACS Style

Aviraj M. Teli; Sonali A. Beknalkar; Sachin A. Pawar; Deepak P. Dubal; Tukaram D. Dongale; Dipali S. Patil; Pramod S. Patil; Jae Cheol Shin. Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO2 Thin-Film Supercapacitors Synthesized by the Hydrothermal Method. Energies 2020, 13, 6124 .

AMA Style

Aviraj M. Teli, Sonali A. Beknalkar, Sachin A. Pawar, Deepak P. Dubal, Tukaram D. Dongale, Dipali S. Patil, Pramod S. Patil, Jae Cheol Shin. Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO2 Thin-Film Supercapacitors Synthesized by the Hydrothermal Method. Energies. 2020; 13 (22):6124.

Chicago/Turabian Style

Aviraj M. Teli; Sonali A. Beknalkar; Sachin A. Pawar; Deepak P. Dubal; Tukaram D. Dongale; Dipali S. Patil; Pramod S. Patil; Jae Cheol Shin. 2020. "Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO2 Thin-Film Supercapacitors Synthesized by the Hydrothermal Method." Energies 13, no. 22: 6124.

Journal article
Published: 19 October 2020 in ACS Applied Materials & Interfaces
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Potassium-ion storage devices are attracting tremendous attention for wide-ranging applications on account of their low cost, fast charge transport in electrolytes, and large working voltage. However, developing cost-effective, high-energy electrodes with excellent structural stability to ensure long-term cycling performance is a major challenge. In this contribution, we have derived two different forms of carbon materials from almond shells using different chemical treatments. For instance, hard carbon (HC) and graphene-like activated carbon (AC) nanosheets are developed by employing simple carbonization and chemical activation routes, respectively. The resultant hard carbon (AS-HC) and activated carbon (AS-AC) exhibit outstanding electrochemical performance as negative and positive electrodes in a potassium-ion battery (KIB), respectively, through their tailor-made surface properties. These promising benefits pave a way to construct a biomass-derived carbon potassium-ion capacitor (KIC) by employing AS-HC as the negative electrode and AS-AC as the positive electrode in a K-based electrolyte. The as-fabricated KIC delivers a reasonable specific energy of 105 Wh/kg and excellent cycling life with negligible capacitance fading over 10 000 cycles. This "waste-to-wealth" approach can promote the development of sustainable KICs at low cost and inspire their use for fast-rate K-based energy storage applications.

ACS Style

Hong Duc Pham; Kiran Mahale; Thi My Linh Hoang; Sagadevan G. Mundree; Pedro Gomez-Romero; Deepak P. Dubal. Dual Carbon Potassium-Ion Capacitors: Biomass-Derived Graphene-like Carbon Nanosheet Cathodes. ACS Applied Materials & Interfaces 2020, 12, 48518 -48525.

AMA Style

Hong Duc Pham, Kiran Mahale, Thi My Linh Hoang, Sagadevan G. Mundree, Pedro Gomez-Romero, Deepak P. Dubal. Dual Carbon Potassium-Ion Capacitors: Biomass-Derived Graphene-like Carbon Nanosheet Cathodes. ACS Applied Materials & Interfaces. 2020; 12 (43):48518-48525.

Chicago/Turabian Style

Hong Duc Pham; Kiran Mahale; Thi My Linh Hoang; Sagadevan G. Mundree; Pedro Gomez-Romero; Deepak P. Dubal. 2020. "Dual Carbon Potassium-Ion Capacitors: Biomass-Derived Graphene-like Carbon Nanosheet Cathodes." ACS Applied Materials & Interfaces 12, no. 43: 48518-48525.

Journal article
Published: 16 October 2020 in Energy Storage Materials
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Potassium-ion battery (KIB) is a promising technology for large-scale energy storage applications due to their low cost, theoretically high energy density and abundant resources. However, the development of KIBs is hindered by the sluggish K+ transport kinetics and the structural instability of the electrode materials during K+ intercalation/de-intercalation. In the present investigation, we have designed a potassium-ion capacitor (KIC) using layered potassium niobate (K4Nb6O17, KNO) nanosheet arrays as anode and orange-peel derived activated carbons (OPAC) as fast capacitive cathode materials. The systematic electrochemical analysis with the ex-situ characterizations demonstrates that KNO-anode exhibits highly stable layered structure with excellent reversibility during K+ insertion/de-insertion. After optimization, the fabricated KNO//OPAC delivers both a high energy density of 116 Wh/kg and high power density of 10,808 W/kg, which is significantly higher than other similar hybrid devices. The cell also displays long term cycling stability over 5000 cycles, with 87 % of capacity retention. This study highlights the utilization of layered nanosheet arrays of niobates to achieve superior K‐storage for KICs, paving the way towards the development of high‐performance anodes for post lithium‐ion batteries.

ACS Style

Hong Duc Pham; Nilesh R. Chodankar; Sagar D. Jadhav; Kolleboyina Jayaramulu; Ashok Kumar Nanjundan; Deepak P. Dubal. Large interspaced layered potassium niobate nanosheet arrays as an ultrastable anode for potassium ion capacitor. Energy Storage Materials 2020, 34, 475 -482.

AMA Style

Hong Duc Pham, Nilesh R. Chodankar, Sagar D. Jadhav, Kolleboyina Jayaramulu, Ashok Kumar Nanjundan, Deepak P. Dubal. Large interspaced layered potassium niobate nanosheet arrays as an ultrastable anode for potassium ion capacitor. Energy Storage Materials. 2020; 34 ():475-482.

Chicago/Turabian Style

Hong Duc Pham; Nilesh R. Chodankar; Sagar D. Jadhav; Kolleboyina Jayaramulu; Ashok Kumar Nanjundan; Deepak P. Dubal. 2020. "Large interspaced layered potassium niobate nanosheet arrays as an ultrastable anode for potassium ion capacitor." Energy Storage Materials 34, no. : 475-482.

Journal article
Published: 06 October 2020 in Sustainable Materials and Technologies
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Graphite is central in almost all commercial Li-ion batteries (LIBs) and possesses attractive physical and chemical properties such as good ionic conductivity and layered graphitic structure. In this communication, we have demonstrated the recycling of graphite from end-of-life LIBs and the re-purposing of the recovered material for positive electrodes in next-generation aluminium-ion-batteries (AIBs). The recovered graphite possesses enlarged interlayer spacing which is shown to effectively boost Al-ion insertion/de-insertion during the charge/discharge processes. Excellent Al-ion storage performance is achieved with the capacity reaching 124 mAh g−1 at 50 mA g−1. The material retained a capacity of 55 mAh g−1 even after the applied current was increased to 500 mA g−1, showing its capability to deliver high rate performance. The charge/discharge cycling further revealed that the graphite retains 81% of its initial capacity even after 6700 cycles at a high rate of 300 mA g−1. This excellent aluminium ion storage performance makes the recovered graphite a promising positive electrode material, providing a possible solution for the recycling of huge amounts of LIB scrap. At the same time, this material aids the development of alternative sustainable battery technology, as an alternative to LIBs.

ACS Style

Hong Duc Pham; Michael Horn; Joseph F.S. Fernando; Rohan Patil; Manisha Phadatare; Dmitri Golberg; Håkan Olin; Deepak P. Dubal. Spent graphite from end-of-life Li-ion batteries as a potential electrode for aluminium ion battery. Sustainable Materials and Technologies 2020, 26, e00230 .

AMA Style

Hong Duc Pham, Michael Horn, Joseph F.S. Fernando, Rohan Patil, Manisha Phadatare, Dmitri Golberg, Håkan Olin, Deepak P. Dubal. Spent graphite from end-of-life Li-ion batteries as a potential electrode for aluminium ion battery. Sustainable Materials and Technologies. 2020; 26 ():e00230.

Chicago/Turabian Style

Hong Duc Pham; Michael Horn; Joseph F.S. Fernando; Rohan Patil; Manisha Phadatare; Dmitri Golberg; Håkan Olin; Deepak P. Dubal. 2020. "Spent graphite from end-of-life Li-ion batteries as a potential electrode for aluminium ion battery." Sustainable Materials and Technologies 26, no. : e00230.

Review article
Published: 17 September 2020 in Reaction Chemistry & Engineering
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At a time of rapid depletion of oil resources, global food shortages and solid waste problems, it is imperative to encourage research into the use of appropriate pre-treatment techniques using regenerative raw materials such as lignocellulosic biomass.

ACS Style

Shahrooz Rahmati; William Doherty; Deepak P. Dubal; Luqman Atanda; Lalehvash Moghaddam; Prashant Murlidhar Sonar; Volker Hessel; Kostya (Ken) Ostrikov. Pretreatment and fermentation of lignocellulosic biomass: reaction mechanisms and process engineering. Reaction Chemistry & Engineering 2020, 5, 2017 -2047.

AMA Style

Shahrooz Rahmati, William Doherty, Deepak P. Dubal, Luqman Atanda, Lalehvash Moghaddam, Prashant Murlidhar Sonar, Volker Hessel, Kostya (Ken) Ostrikov. Pretreatment and fermentation of lignocellulosic biomass: reaction mechanisms and process engineering. Reaction Chemistry & Engineering. 2020; 5 (11):2017-2047.

Chicago/Turabian Style

Shahrooz Rahmati; William Doherty; Deepak P. Dubal; Luqman Atanda; Lalehvash Moghaddam; Prashant Murlidhar Sonar; Volker Hessel; Kostya (Ken) Ostrikov. 2020. "Pretreatment and fermentation of lignocellulosic biomass: reaction mechanisms and process engineering." Reaction Chemistry & Engineering 5, no. 11: 2017-2047.

Review
Published: 06 August 2020 in Small
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The development of pseudocapacitive materials for energy‐oriented applications has stimulated considerable interest in recent years due to their high energy‐storing capacity with high power outputs. Nevertheless, the utilization of nanosized active materials in batteries leads to fast redox kinetics due to the improved surface area and short diffusion pathways, which shifts their electrochemical signatures from battery‐like to the pseudocapacitive‐like behavior. As a result, it becomes challenging to distinguish “pseudocapacitive” and “battery” materials. Such misconceptions have further impacted on the final device configurations. This Review is an earnest effort to clarify the confusion between the battery and pseudocapacitive materials by providing their true meanings and correct performance metrics. A method to distinguish battery‐type and pseudocapacitive materials using the electrochemical signatures and quantitative kinetics analysis is outlined. Taking solid‐state supercapacitors (SSCs, only polymer gel electrolytes) as an example, the distinction between asymmetric and hybrid supercapacitors is discussed. The state‐of‐the‐art progress in the engineering of active materials is summarized, which will guide for the development of real‐pseudocapacitive energy storage systems.

ACS Style

Nilesh R. Chodankar; Hong Duc Pham; Ashok Kumar Nanjundan; Joseph F. S. Fernando; Kolleboyina Jayaramulu; Dmitri Golberg; Young‐Kyu Han; Deepak P. Dubal. True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors. Small 2020, 16, 1 .

AMA Style

Nilesh R. Chodankar, Hong Duc Pham, Ashok Kumar Nanjundan, Joseph F. S. Fernando, Kolleboyina Jayaramulu, Dmitri Golberg, Young‐Kyu Han, Deepak P. Dubal. True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors. Small. 2020; 16 (37):1.

Chicago/Turabian Style

Nilesh R. Chodankar; Hong Duc Pham; Ashok Kumar Nanjundan; Joseph F. S. Fernando; Kolleboyina Jayaramulu; Dmitri Golberg; Young‐Kyu Han; Deepak P. Dubal. 2020. "True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors." Small 16, no. 37: 1.

Paper
Published: 19 June 2020 in Journal of Materials Chemistry A
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Vanadium(iii) oxide (V2O3) derived, carbon integrated hydrated vanadium oxide (V5O12·0.4H2O) as an extrinsic pseudocapacitive material for excellent lithium storage in lithium ion battery anodes.

ACS Style

Joseph F. S. Fernando; Dumindu P. Siriwardena; Konstantin L. Firestein; Chao Zhang; Joel E. von Treifeldt; Courtney-Elyce M. Lewis; Tony Wang; Deepak P. Dubal; Dmitri V. Golberg. Enriched pseudocapacitive lithium storage in electrochemically activated carbonaceous vanadium(iv, v) oxide hydrate. Journal of Materials Chemistry A 2020, 8, 13183 -13196.

AMA Style

Joseph F. S. Fernando, Dumindu P. Siriwardena, Konstantin L. Firestein, Chao Zhang, Joel E. von Treifeldt, Courtney-Elyce M. Lewis, Tony Wang, Deepak P. Dubal, Dmitri V. Golberg. Enriched pseudocapacitive lithium storage in electrochemically activated carbonaceous vanadium(iv, v) oxide hydrate. Journal of Materials Chemistry A. 2020; 8 (26):13183-13196.

Chicago/Turabian Style

Joseph F. S. Fernando; Dumindu P. Siriwardena; Konstantin L. Firestein; Chao Zhang; Joel E. von Treifeldt; Courtney-Elyce M. Lewis; Tony Wang; Deepak P. Dubal; Dmitri V. Golberg. 2020. "Enriched pseudocapacitive lithium storage in electrochemically activated carbonaceous vanadium(iv, v) oxide hydrate." Journal of Materials Chemistry A 8, no. 26: 13183-13196.

Research article
Published: 21 April 2020 in Inorganic Chemistry Frontiers
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Pharmaceuticals are considered as emerging organic contaminants that have become a serious environmental problem, which endanger human health and environmental bio-diversity.

ACS Style

Reza Abazari; Ali Morsali; Deepak P. Dubal. An advanced composite with ultrafast photocatalytic performance for the degradation of antibiotics by natural sunlight without oxidizing the source over [email protected]–Ti LDH: mechanistic insight and toxicity assessment. Inorganic Chemistry Frontiers 2020, 7, 2287 -2304.

AMA Style

Reza Abazari, Ali Morsali, Deepak P. Dubal. An advanced composite with ultrafast photocatalytic performance for the degradation of antibiotics by natural sunlight without oxidizing the source over [email protected]–Ti LDH: mechanistic insight and toxicity assessment. Inorganic Chemistry Frontiers. 2020; 7 (12):2287-2304.

Chicago/Turabian Style

Reza Abazari; Ali Morsali; Deepak P. Dubal. 2020. "An advanced composite with ultrafast photocatalytic performance for the degradation of antibiotics by natural sunlight without oxidizing the source over [email protected]–Ti LDH: mechanistic insight and toxicity assessment." Inorganic Chemistry Frontiers 7, no. 12: 2287-2304.