Morphology Control Of Co3o4 With Nickel Incorporation For Highly Efficient Oxygen Evolution Reaction
APPLIED SURFACE SCIENCE(2021)
摘要
Co3O4 with different morphologies including nanomeshs, nanorods, and nanowires structures were prepared by one-step hydrothermal method using various precursors. The Co3O4 nanowires arrays showed the optimal oxygen evolution reaction (OER) performance with an overpotential of 394 mV at 20 mA cm(-2) and Tafel slope of 112 mV dec(-1) in alkaline electrolyte. Subsequently, the effect of Ni doping on OER activity of Co3O4 nanowires arrays was further studied under identical conditions. Notably, the as-prepared 12% Co3O4 (the molar ratio of Ni to Co is 12%) rendered the best activity with a low overpotential of 340 mV to achieve 20 mA cm(-2) and Tafel slope of 60 mV dec(-1), and superior stability, outperforming other Ni-Co3O4 samples. Density functional theory (DFT) calculations revealed that the theoretical overpotentials of Co3O4 and Ni-Co(3)O(4 )were calculated to be 1.70 V and 0.51 V, respectively, and the chemical conversion from OH* to O* is the ratelimiting step (RLS) with energy barrier of 1.74 eV for Ni-Co3O4. Therefore, this study provides a promising method for designing highly active and stable substitution for noble metal catalysts toward OER.
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关键词
Morphology evolution, Ni-Co3O4, Electrocatalytic, Oxygen evolution reaction
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