DataSheet1_Mo modified Co3O4 nanosheets array by a rapid quenching strategy for efficient oxygen evolution electrocatalysis.pdf

The development of transition metal oxides (TMOs) as electrocatalysts for oxygen evolution reaction (OER) has the potential to surpass the performance of noble-metal-based catalysts. In this work, a quenching rapidly strategy was used to synthesize Mo-modified Co3O4 nanosheet arrays as advanced catalysts. The resulting Mo-Co3O4 electrodes showed superior activity and reaction kinetics, with an overpotential of only 341 mV to drive a current density of 100 mA cm−2 and a Tafel slope of 69.0 mV dec−1. This improved performance is thought to be due to the formation of high-valence Co sites, which creates a synergistic effect. The ability to regulate the synthesis without causing obvious agglomeration and nucleation growth during annealing makes this method a promising approach for the design of other advanced functional materials.

过渡金属氧化物（transition metal oxides, TMOs）作为析氧反应（oxygen evolution reaction, OER）电催化剂的开发，有望超越贵金属基催化剂的性能。本研究采用快速淬火策略，合成了钼修饰的四氧化三钴（Co₃O₄）纳米片阵列作为高性能电催化剂。所得钼-四氧化三钴电极展现出优异的催化活性与反应动力学特性：当电流密度达到100 mA·cm⁻²时，仅需341 mV的过电位（overpotential），塔菲尔斜率（Tafel slope）为69.0 mV·dec⁻¹。研究表明，该性能提升源于高价态钴位点的形成，由此产生协同效应。该合成方法可在退火（annealing）过程中避免明显的团聚与晶核生长，实现对产物的精准调控，因此为其他先进功能材料的设计与制备提供了极具潜力的可行方案。