过电位
析氧
电催化剂
铱
溶解
催化作用
材料科学
掺杂剂
无机化学
氧化物
化学工程
离子液体
电化学
吸附
铼
化学
兴奋剂
物理化学
电极
工程类
生物化学
冶金
光电子学
作者
Wenjing Huo,Xuemei Zhou,Yuwei Jin,Canquan Xie,Shuo Yang,Jinjie Qian,Dong Cai,Yifei Ge,Yongquan Qu,Huagui Nie,Zhi Yang
出处
期刊:Small
[Wiley]
日期:2023-02-11
卷期号:19 (19)
被引量:11
标识
DOI:10.1002/smll.202207847
摘要
IrO2 as benchmark electrocatalyst for acidic oxygen evolution reaction (OER) suffers from its low activity and poor stability. Modulating the coordination environment of IrO2 by chemical doping is a methodology to suppress Ir dissolution and tailor adsorption behavior of active oxygen intermediates on interfacial Ir sites. Herein, the Re-doped IrO2 with low crystallinity is rationally designed as highly active and robust electrocatalysts for acidic OER. Theoretical calculations suggest that the similar ionic sizes of Ir and Re impart large spontaneous substitution energy and successfully incorporate Re into the IrO2 lattice. Re-doped IrO2 exhibits a much larger migration energy from IrO2 surface (0.96 eV) than other dopants (Ni, Cu, and Zn), indicating strong confinement of Re within the IrO2 lattice for suppressing Ir dissolution. The optimal catalysts (Re: 10 at%) exhibit a low overpotential of 255 mV at 10 mA cm-2 and a high stability of 170 h for acidic OER. The comprehensive mechanism investigations demonstrate that the unique structural arrangement of the Ir active sites with Re-dopant imparts high performance of catalysts by minimizing Ir dissolution, facilitating *OH adsorption and *OOH deprotonation, and lowering kinetic barrier during OER. This study provides a methodology for designing highly-performed catalysts for energy conversion.
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