Active Sites Engineered Bimetallic Iron–Vanadium Oxide (FeVO_<i>x</i>) Thin Film Electrocatalyst for Efficient and Sustainable Water Oxidation

Designing a cost-effective and highly active thin film electrocatalyst is crucial for expediting the kinetics of oxygen evolution reaction (OER) for clean hydrogen production via water electrolysis. Herein, we report the fabrication of efficient and robust OER catalysts by depositing thin films of iron–vanadium oxide (FeVOx) on nickel foam (NF) using aerosol-assisted chemical vapor deposition (AACVD). Different morphological variants of the FeVOx catalyst prepared within 40 to 120 min were thoroughly investigated for water oxidation in 1.0 M KOH solution. The corresponding electrochemical experiments validate the exceptional OER performance of the FeVOx-40 catalyst, as the oxidation current density sharply increases from 10 to 1000 mA cm–2 within a narrow overpotential range of 270–330 mV (vs RHE). Moreover, this catalyst retains its initial morphology and composition even after performing continuous OER operation for 100 h. The outstanding catalytic performance of FeVOx-40 was credited to its distinctive morphological synergy with the underlying NF support, which enhanced the overall conductivity of the catalytic system. The straightforward fabrication and effective operation of the bimetallic catalytic system (FeVOx/NF) enable communities to develop and utilize novel electrocatalysts for water dissociation.

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