Abstract
Transition metal hydr(oxy)oxides are one of the most efficient electrocatalysts towards oxygen evolution reaction (OER). However, structural-dependant and low stability severely hinder their overall performance and catalytic efficiency. Herein, we report the enhancement of OER activity via vanadium doping into the CoFe hydr(oxy)oxide electrocatalyst (denoted as CoFeV). Our results show that the incorporation of vanadium induces fragmentation of the polycrystalline structure of the CoFe hydr(oxy)oxide (CoFe) and transformation to a more active amorphous structure, greatly exposing the CoO and FeOOH active sites on the surface for OER. The optimised electrocatalyst exhibits an overpotential of 376 mV to reach a current density of 10 mA cm−2 and requires a small Tafel slope of 26 mV dec−1 for OER in alkaline media. These results illustrate that vanadium doping can efficiently improve the catalytic activity of CoFeV which can be extended to other vanadium-doped transition metal hydr(oxy)oxides as promising electrocatalysts for OER applications.
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