Abstract
Oxygen evolution reaction (OER) suffers a complex four-electron process with sluggish kinetics, which severely hinders its practical application. In general, Ni-based spinel-structured materials have emerged as potential electrocatalysts for OER. However, fabricating surface with high efficient Ni3+ active sites for Ni-based spinel is thermodynamically unfavorable, which impedes the future development and application of Ni-based spinel. In this study, we have formulated a octahedral (Oh) sites doping route for the synthesis of a Ni3+-riched Ni(Co1.98Ni0.02)O4. The results demonstrate that the catalyst with high density of surface Ni3+ active sites exhibits an improved OER catalytic activity compared with NiCo2O4 and requires a low overpotential of 349 mV at a current density of 10 mA cm−2.
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