过电位
电催化剂
析氧
催化作用
电解质
材料科学
溶解
电化学
合金
金属
分解水
电子结构
密度泛函理论
化学物理
化学工程
化学
无机化学
物理化学
计算化学
冶金
电极
有机化学
工程类
光催化
出处
期刊:Springer theses
日期:2022-01-01
卷期号:: 55-92
被引量:2
标识
DOI:10.1007/978-981-19-0205-5_3
摘要
Single-atom precious metal catalysts hold the promise of perfect atom utilization, yet control of their activity and stability remains challenging. Here we show that engineering the electronic structure of atomically dispersed Ru1 on metal supports via compressive strain boosts the kinetically sluggish electrocatalytic oxygen evolution reaction (OER), and mitigates the degradation of Ru-based electrocatalysts in an acidic electrolyte. We construct a series of alloy-supported Ru1 using different PtCu alloys through sequential acid etching and electrochemical leaching, and find a volcano relation between OER activity and the lattice constant of the PtCu alloys. Our best catalyst, Ru1–Pt3Cu, delivers 90 mV lower overpotential to reach a current density of 10 mA cm−2, and an order of magnitude longer lifetime over that of commercial RuO2. Density functional theory investigations reveal that the compressive strain of the Ptskin shell engineers the electronic structure of the Ru1, allowing optimized binding of oxygen species and better resistance to over-oxidation and dissolution.
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