Issue 17, 2024

Activating cobalt inverse spinel oxides via Fe substitution for enhanced water splitting reaction

Abstract

Owing to their expeditious kinetics and remarkable catalytic prowess, spinel oxides have attracted significant attention as promising non-precious metal electrocatalysts for oxygen evolution reaction (OER). Modulating the oxidation state of the catalytically active B site in the spinel structure is a highly potent strategy for amplifying their OER activity. Investigations into the impact of Fe doping on the oxidation state as well as the electronic configuration of Co in NiCo2O4 revealed the generation of Co3+ ions with an electron occupancy close to one in the eg orbital, leading to an increased production of intermediate –OOH species, thereby accelerating the OER kinetics. The synergistic effect due to the optimal presence of Fe and Co in the NiCo0.5Fe1.5O4 catalyst allowed the catalyst to exhibit a reduced overpotential of 310 mV at 10 mA cm−2 with a constant current density for 22 h in the chronoamperometric study.

Graphical abstract: Activating cobalt inverse spinel oxides via Fe substitution for enhanced water splitting reaction

Supplementary files

Article information

Article type
Paper
Submitted
06 Apr 2024
Accepted
15 Jul 2024
First published
16 Jul 2024
This article is Open Access
Creative Commons BY-NC license

Sustainable Energy Fuels, 2024,8, 3854-3864

Activating cobalt inverse spinel oxides via Fe substitution for enhanced water splitting reaction

S. Roy and S. Roy, Sustainable Energy Fuels, 2024, 8, 3854 DOI: 10.1039/D4SE00468J

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