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

Jiang, Jinxia1; Liao, Jianhua1,2; Tao, Sicheng1; Najam, Tayyaba1; Ding, Wei1; Wang, Haijiang2; Wei, Zidong1

2020

10.1016/j.electacta.2019.135444

ELECTROCHIMICA ACTA   影响因子和分区

0013-4686

1873-3859

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.
© 2019 Elsevier Ltd

Surface modification HOR/HER Alloy and de-alloy OH adsorption

SCI ; EI

英语

其他

National Natural Science Foundation of China[21761162015]

Electrochemistry

Electrochemistry

WOS:000507341600023

Elsevier Ltd

20195207922981

Adsorption ; Catalysts ; Hydrogen ; Iridium alloys ; Nanocrystalline alloys ; Surface treatment ; Transition metals

Metallurgy and Metallography:531 ; Precious Metals:547.1 ; Nanotechnology:761 ; Chemical Operations:802.3 ; Chemical Products Generally:804

CHEMISTRY

Web of Science

1.Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing; 400044, China
2.Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen; 518055, China

Jiang, Jinxia,Liao, Jianhua,Tao, Sicheng,et al. Modulation of iridium-based catalyst by a trace of transition metals for hydrogen oxidation/evolution reaction in alkaline[J]. ELECTROCHIMICA ACTA,2020,333.

Jiang, Jinxia.,Liao, Jianhua.,Tao, Sicheng.,Najam, Tayyaba.,Ding, Wei.,...&Wei, Zidong.(2020).Modulation of iridium-based catalyst by a trace of transition metals for hydrogen oxidation/evolution reaction in alkaline.ELECTROCHIMICA ACTA,333.

Jiang, Jinxia,et al."Modulation of iridium-based catalyst by a trace of transition metals for hydrogen oxidation/evolution reaction in alkaline".ELECTROCHIMICA ACTA 333(2020).