Modulation of iridium-based catalyst by a trace of transition metals for hydrogen oxidation/evolution reaction in alkaline

被引：33

作者：

Jiang, Jinxia ^{[1
]}

Liao, Jianhua ^{[1
,2
]}

Tao, Sicheng ^{[1
]}

Najam, Tayyaba ^{[1
]}

Ding, Wei ^{[1
]}

Wang, Haijiang ^{[2
]}

Wei, Zidong ^{[1
]}

机构：

[1] Chongqing Univ, Coll Chem & Chem Engn, Chongqing Key Lab Chem Proc Clean Energy & Resour, Chongqing 400044, Peoples R China

[2] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2020年 / 333卷

基金：

中国国家自然科学基金;

关键词：

Surface modification; HOR/HER; Alloy and de-alloy; OH adsorption; SINGLE-CRYSTAL SURFACES; ELECTROLYTIC HYDROGEN; EVOLUTION; PLATINUM; OXIDATION; ACID; ELECTROCHEMISTRY; ELECTROOXIDATION; ELECTRODES; ADSORPTION;

D O I：

10.1016/j.electacta.2019.135444

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We report that trace level of metal impurities on the surface of Ir alloy nanocrystals show a great impact on the electrocatalytic activity for the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER). The HOR/HER activities were found to be predominantly related to OH adsorption that is related to the surface impurity content. Further, it was found that the foreign metal species on Ir surface could effectively enhance or depress HOR activity depending on their oxophilicity. We found that there is a volcano-shaped dependence of HOR/HER activity on the OH adsorption strength; and trace Fe species or moderate oxophilic Ru atoms on the surface of Ir based catalyst bring the modest OH adsorption and lead to enhanced HOR/HER activity. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：7

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