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题名: Gold-iridium bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions
作者: Yuan, Lizhi1, 2;  Yan, Zhao1, 2;  Jiang, Luhua1;  Wang, Erdong1;  Wang, Suli1;  Sun, Gongquan1
关键词: Oxygen reduction reaction ;  Oxygen evolution reaction ;  Gold ;  Iridium ;  Bifunctional catalyst
刊名: JOURNAL OF ENERGY CHEMISTRY
发表日期: 2016-09-01
DOI: 10.1016/j.jechem.2016.04.013
卷: 25, 期:5, 页:805-810
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Energy & Fuels ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Energy & Fuels ;  Engineering
英文摘要: 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. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
关键词[WOS]: REGENERATIVE FUEL-CELL ;  ONE-POT SYNTHESIS ;  AIR BATTERIES ;  FACILE SYNTHESIS ;  CATALYST ;  NANOPARTICLES ;  OXIDATION ;  ETHANOL ;  IR ;  EVOLUTION/REDUCTION
语种: 英语
WOS记录号: WOS:000390131200009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150514
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Div Fuel Cell & Battery, Dalian 116023, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China

Recommended Citation:
Yuan, Lizhi,Yan, Zhao,Jiang, Luhua,et al. Gold-iridium bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions[J]. JOURNAL OF ENERGY CHEMISTRY,2016,25(5):805-810.
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