Abstract
Bimetallic Co-based spinel oxides have been regarded as promising electrocatalysts for oxygen evolution reaction (OER), whereas, the catalytic activity still needs to be improved, and the regulation mechanism of intrinsic activity by various cations substitution remains challenges due to nanoarray morphologies difference. Herein, well-organized nanoarrays of nickel-, copper-, zinc-cobalt spinel oxides (NCO, CCO, ZCO) and pristine Co3O4 with same microstructure are controllably fabricated. The time-dependent growth process of specific nanoarrays is investigated, as well as catalytic mechanism of enhanced OER activity. Cationic substitution promotes the OER activity and CCO possesses the best activity due to the highest Co valence. Theoretic simulations further validate the valence state of octahedral Co active sites increase most when doped with Cu ions, contributing to accelerated OER kinetics. Importantly, this work provides new insights to rationally design high-performance OER catalysts for matching experimental results and catalytic mechanism studies.
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