Gold-iridium bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions

Gold-iridium bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions

Lizhi Yuan;Zhao Yan;Luhua Jiang;Erdong Wang;Suli Wang;Gongquan Sun

【期刊名称】《天然气化学（英文版）》 【年(卷),期】2016(025)005

【摘要】Carbon supported gold-iridium composite (AuIr/C) was synthesized by a facile one-step process and was investigated as the bifunctional catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).The physical properties of the AuIr/C composite were characterized by transmission electron microscopy (TEM),X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS).Although the Au and Ir in the AuIr/C did not form alloy,it is clear that the introduction of Ir decreases the average Au particle size to 4.2 nm compared to that in the Au/C (10.1 nm).By systematical analysis on chemical state of metal surface via XPS and the electrochemical results,it was found that the Au surface for the Au/C can be activated by potential cycling from 0.12 V to 1.72 V,resulting in the increased surface roughness of Au,thus improving the ORR activity.By the same potential cycling,the Ir surface of the Ir/C was irreversibly oxidized,leading to degraded ORR activity but uninfluenced OER activity.For the AuIr/C,Ir protects Au against being oxidized due to the lower electronegativity of Ir.Combining the advantages of Au and Ir in catalyzing ORR and OER,the

AuIr/C catalyst displays an enhanced catalytic activity to the ORR and a comparable OER activity.In the 50-cycle accelerated aging test for the ORR and OER,the AuIr/C displayed a satisfied stability,suggesting that the AuIr/C catalyst is a potential bifunctional catalyst for the oxygen electrode.

【总页数】6页(805-810) 【关键词】

【作者】Lizhi Yuan;Zhao Yan;Luhua Jiang;Erdong Wang;Suli Wang;Gongquan Sun

【作者单位】Division of Fuel Cell & Battery, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;University of Chinese Academy of Sciences, Beijing 100039, China;Division of Fuel Cell & Battery, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;University of Chinese Academy of Sciences, Beijing 100039, China;Division of Fuel Cell & Battery, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;Division of Fuel Cell & Battery, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;Division of Fuel Cell & Battery, Dalian

National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;Division of Fuel Cell & Battery, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China 【正文语种】英文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_natural-gas-chemistry-english_thesis/0201218502500.html 【相关文献】

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