长石
过电位
塔菲尔方程
化学
析氧
氧化物
催化作用
密度泛函理论
电子结构
无机化学
物理化学
电化学
计算化学
电极
生物化学
有机化学
作者
Chuanhui Zhu,Guohong Cai,Changlai Yuan,Bin Huang,Guangqin Li,Mark Croft,M. Greenblatt,Man-Rong Li
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-05-01
卷期号:169 (5): 056523-056523
被引量:2
标识
DOI:10.1149/1945-7111/ac7106
摘要
Exploring a simple model system to realize the intrinsic guidelines of activity for oxide electrocatalysts is urgent and important. Here, we introduce delafossite oxides A 2 IrO 3 ( A = Li, Na, Cu) as a family of oxygen evolution reaction electrocatalysts in alkaline media. We show that, in Cu 2 IrO 3 , the intrinsic intersite charge transfer between Cu and Ir improves the electrocatalytic activity by simultaneously increasing the conductivity and reducing the Tafel slope down to 51 mV dec −1 with an overpotential η 10 = 361 mV. Through a comparative study, the improved activity of Cu 2 IrO 3 is attributed to the increase of Ir 5 d projected electronic density of states with extended Ir–O bond length. This study provides insights into advanced catalyst design through tailoring the active site of oxides by the modulation of electronic states in a given structural motif.
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