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Dr. Priyanka Aggarwal

 

Dr. Priyanka Aggarwal

Tantia University
India

Abstract Title: Superior Electrochemical Water Splitting Achieved by Incorporating Molybdenum in Self-standing NiSe2/CoSe2 Heterostructures

Biography:

Dr. Priyanka Aggarwal is an Assistant Professor in the Department of Physics at Tantia University, Sriganganagar. She earned her PhD in Physics from Malaviya National Institute of Technology (MNIT), Jaipur, where her research focused on “Modified Transition Metal Dichalcogenide Electrocatalysts for Enhanced Hydrogen Evolution Reaction”. She has a strong academic background with an M.Sc. and B.Sc. in Physics and has successfully qualified national-level examinations including CSIR-NET-JRF (AIR-119) and GATE. Her research interests include electrocatalysis, energy materials, water splitting, nanomaterials synthesis, hydrogen evolution reaction, oxygen evolution reaction, electrochemical analysis, Materials characterization, and transition metal dichalcogenides (TMDs). She has published several research papers in peer-reviewed journals, authored book chapters, and contributed to high-impact publications. She was selected for the prestigious Sakura Science Exchange Program in Japan and visited for academic and research exchange. She was also honored with the Best Presentation Award at an international conference for her work on advanced electrocatalysts for hydrogen generation.

Research Interest:

The strategic development of highly active, low-cost, and durable electrocatalysts for hydrogen (HER) and oxygen evolution (OER) reactions is crucial for the advancement of renewable energy technologies. In this study, we explore a unique heterostructure composed of molybdenum-doped NiSe2/CoSe2 (Mo-NiSe2/CoSe2) supported on nickel foam substrate as efficient electrocatalyst for HER, OER, and overall water splitting. The binder-free Mo-NiSe2/CoSe2 catalyst demonstrated exceptional performance with overpotentials of a mere 99, 198, and 342 mV (at -10, -100 and -500 mA cm−2) for HER and 254, 340, 400 mV (at 10, 100, and 500 mA cm−2) for OER, along with Tafel slopes of 84.9 mV dec−1 and 49.4 mV dec−1, respectively, in 1 M KOH solution. As a bifunctional electrocatalyst for the overall water splitting, Mo-NiSe2/CoSe2 achieved a low cell voltage of 1.66 V at a current density of 10 mA cm−2 and displayed remarkable stability over 96 h. Mo-doping and the synergistic effects from heterointerfaces has helped in reducing water dissociation barrier, offer abundant active sites, and facilitate electron transfer kinetics, thereby improving both the catalytic activity and durability. Moreover, post-OER characterization reveals the surface oxidation of Mo-NiSe2/CoSe2 to form Mo-doped NiOOH/CoOOH species on the catalyst surface during the OER process that actually contributes to the outstanding OER activity and stability. This study highlights the potential of metal-doped heterostructured diselenides in advancing the scalability of alkaline water splitting.

KEYWORDS: Mo doping, Hydrogen evolution reaction; water splitting; metal selenides; bifunctional electrocatalysts