ItemArticle

Synergistic enhancement of bifunctionality in Ni-doped VO2 (B) nanostructures: A pathway for improved water electrocatalysis

Title
Synergistic enhancement of bifunctionality in Ni-doped VO2 (B) nanostructures: A pathway for improved water electrocatalysis
Creator
J S, Anju; Chacko, Levna; Kenguruse, N Neipedenuo; Aneesh, P.M.
Description
The global energy demand led to the exploration of techniques to produce green hydrogen, such as water electrolysis, as a future fuel for energy management. However, the efficiency of hydrogen evolution (HER) during this electrocatalysis is usually regulated by the proficiency of the catalyst in generating a facile oxygen evolution reaction (OER). In this work, the robust bifunctionality of Ni-doped VO2(B) as an electrocatalyst for hydrogen and oxygen evolution reactions is investigated. The optical characterization uncovered the semiconducting nature of nanoflake-like VO2(B) nanostructures. Furthermore, optimizing Ni concentration resulted in significant reduction of overpotentials from 518 mV to 289 mV for HER and from 435 mV to 404 mV for OER under a current density of 10 mA/cm2. This excellent electrochemical efficiency of the Ni-doped VO2(B) nanostructures is further showcased by the low Tafel slope values of 129 mV/dec and 99 mV/dec for HER and OER, respectively. Consistent with these findings, the materials exhibited minimal charge transfer resistance of 57.1 ?, reinforcing the superior electrocatalytic activity. Additionally, the chronopotentiometric studies confirmed the long-term stability of the nanostructures. Altogether, Ni-doped VO2(B) nanostructures can be considered as a potential electrocatalyst for overall water electrolysis, laying the foundation for a sustainable energy future. 2025 Elsevier B.V.
Source
Journal of Power Sources;Volume;656;Issue;;Article No.;238054;
Date
01-01-2025
Publisher
Elsevier B.V.
Subject
Doping; Electrocatalysis; Hydrogen evolution reaction; Oxygen evolution reaction; Vanadium dioxide
Coverage
J S A., Department of Physics, Central University of Kerala, Periye, Kerala, Kasaragod, 671325, India; Chacko L., Department of Physics and Electronics, CHRIST University, Karnataka, Bangalore, 560029, India; Kenguruse N.N., Department of Physics, Central University of Kerala, Periye, Kerala, Kasaragod, 671325, India; Aneesh P.M., Department of Physics, Central University of Kerala, Periye, Kerala, Kasaragod, 671325, India
Rights
Restricted Access; Hardcopy may be available in the library
Relation
ISSN: 3787753; CODEN: JPSOD
Format
online
Language
English
Type
Article

Citation

J S, Anju; Chacko, Levna; Kenguruse, N Neipedenuo; Aneesh, P.M., “Synergistic enhancement of bifunctionality in Ni-doped VO2 (B) nanostructures: A pathway for improved water electrocatalysis,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22369.

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