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Gold-iridium bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions
Yuan, Lizhi1,2; Yan, Zhao1,2; Jiang, Luhua1; Wang, Erdong1; Wang, Suli1; Sun, Gongquan1
KeywordOxygen Reduction Reaction Oxygen Evolution Reaction Gold Iridium Bifunctional Catalyst
Source PublicationJOURNAL OF ENERGY CHEMISTRY
2016-09-01
DOI10.1016/j.jechem.2016.04.013
Volume25Issue:5Pages:805-810
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Energy & Fuels ; Engineering, Chemical
WOS Research AreaChemistry ; Energy & Fuels ; Engineering
WOS KeywordREGENERATIVE FUEL-CELL ; ONE-POT SYNTHESIS ; AIR BATTERIES ; FACILE SYNTHESIS ; CATALYST ; NANOPARTICLES ; OXIDATION ; ETHANOL ; IR ; EVOLUTION/REDUCTION
AbstractCarbon 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.
Language英语
WOS IDWOS:000390131200009
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/150514
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Yuan, Lizhi,Yan, Zhao,Jiang, Luhua,Wang, Erdong,Wang, Suli,&Sun, Gongquan.(2016).Gold-iridium bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions.JOURNAL OF ENERGY CHEMISTRY,25(5),805-810.
MLA Yuan, Lizhi,et al."Gold-iridium bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions".JOURNAL OF ENERGY CHEMISTRY 25.5(2016):805-810.
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