过电位
塔菲尔方程
析氧
材料科学
催化作用
密度泛函理论
过渡金属
电解质
纳米颗粒
化学工程
电化学
分解水
金属
无机化学
纳米技术
物理化学
冶金
化学
计算化学
电极
工程类
光催化
生物化学
作者
Congling Hu,Lei Zhang,Zhi‐Jian Zhao,Jun Luo,Jing Shi,Zhiqi Huang,Jinlong Gong
标识
DOI:10.1002/adma.201701820
摘要
Transition‐metal oxides are extensively investigated as efficient electrocatalysts for the oxygen evolution reaction (OER). However, large‐scale applications remain challenging due to their moderate catalytic activity. Optimized regulation of surface states can lead to improvement of catalytic properties. Here, the design of Mn@Co x Mn 3− x O 4 nanoparticles with abundant edge sites via a simple seed‐mediated growth strategy is described. The unsaturated coordination generated on the edge sites of Co x Mn 3− x O 4 shells makes a positive contribution to the surface‐structure tailoring. Density functional theory calculations indicate that the edge sites with unsaturated coordination exhibit intense affinity for OH − in the alkaline electrolyte, which greatly enhances the electrochemical OER performance of the catalysts. The resulting Mn@Co x Mn 3− x O 4 catalysts yield a current density of 10 mA cm −2 at an overpotential of 246 mV and a relatively low Tafel slope of 46 mV dec −1 . The successful synthesis of these metal oxides nanoparticles with edge sites may pave a new path for rationally fabricating efficient OER catalysts.
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