ItemArticle

Optimized trimetallic CoNiFe phospho-boride electrocatalyst for overall seawater electrolysis

Title
Optimized trimetallic CoNiFe phospho-boride electrocatalyst for overall seawater electrolysis
Creator
Kanwar, Tristha; Arun, Pranav; Silviya, R.; Bhide, Aniruddha; Gupta, Suraj; Patel, Rupali; Fernandes, Rohan; Patel, Nainesh
Description
Utilizing abundant seawater for hydrogen production by electrolysis poses new challenges to electrocatalyst performance, demanding effectiveness, resilience, and selectivity for oxygen evolution reactions (OER) over undesired reactions in harsh saline conditions. Herein, trimetallic phospho-boride, CoNiFePB, was synthesized via a chemical reduction method by carefully tuning the concentrations of all elements for overall seawater splitting. The optimized CoNiFePB demonstrated superior OER activity, requiring only 239 mV to achieve 10 mA/cm2 in alkaline simulated seawater, outperforming bimetallic configurations (CoNiPB and CoFePB). The enhancement in hydrogen evolution reaction (HER) activity was attained by adjusting the B/P molar ratio in CoNiFePB, resulting in a low overpotential of 137 mV. A comprehensive kinetic analysis revealed that Ni and Fe play crucial roles in enhancing the adsorption and desorption of the reactant and product, respectively, while Co serves as the active site for intermediate formation, collectively boosting the activity of the trimetallic CoNiFePB. While the electron modulation achieved by B and P triggers the formation of active sites and avoids chloride ion oxidation. The bifunctional CoNiFePB catalyst deposited on Ni foam (NF) demonstrated excellent durability for 10,000 cycles and maintained performance for 70 h in chronoamperometric testing at a high current density of 0.7 A/cm2, emphasizing its long-term stability in alkaline seawater. When integrated into an advanced seawater electrolyzer with a zero-gap assembly, CoNiFePB/NF achieved a current density of 2 A/cm2 at a cell voltage of approximately 2.43 V in alkaline natural seawater. These findings provide significant insights into electrocatalysis for seawater splitting with promising implications for commercial applications. 2025 Elsevier B.V.
Source
Journal of Power Sources;Volume;633;Issue;;Article No.;236427;
Date
01-01-2025
Publisher
Elsevier B.V.
Subject
Electrocatalyst; Overall seawater electrolysis; Phospho-borides; Transition-metal
Coverage
Kanwar T., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Arun P., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Silviya R., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Bhide A., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Gupta S., Advanced Materials Department, Joef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia; Patel R., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Fernandes R., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India; Patel N., Department of Physics and Electronics, Christ University, Bengaluru, 560029, India
Rights
Restricted Access; Hardcopy may be available in the library
Relation
ISSN: 3787753; CODEN: JPSOD
Format
online
Language
English
Type
Article

Citation

Kanwar, Tristha; Arun, Pranav; Silviya, R.; Bhide, Aniruddha; Gupta, Suraj; Patel, Rupali; Fernandes, Rohan; Patel, Nainesh, “Optimized trimetallic CoNiFe phospho-boride electrocatalyst for overall seawater electrolysis,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22368.

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