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题名: Electrocatalytic activity and stability of Ag-MnOx/C composites toward oxygen reduction reaction in alkaline solution
作者: Wu, Qiumei1, 2;  Jiang, Luhua1;  Qi, Luting1;  Yuan, Lizhi1;  Wang, Erdong1;  Sun, Gongquan1
关键词: Oxygen reduction reaction ;  manganese oxide ;  silver ;  zinc-air battery
刊名: ELECTROCHIMICA ACTA
发表日期: 2014-03-20
DOI: 10.1016/j.electacta.2013.12.125
卷: 123, 页:167-175
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: Ag-MnOx/C composites were prepared using AgNO3 and KMnO4 as the precursors and Vulcan XC-72 as the support. The physical properties of the Ag-MnOx/C composites were investigated via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The activity and the stability of the series of Ag-MnOx/C composites toward the oxygen reduction reaction (ORR) in alkaline media were investigated through the electrochemical techniques. The results show that the main species MnO2 and Ag2O in the fresh sample convert into Mn3O4 and Ag(0), respectively, after the heat treatment in N-2 at 300 degrees C (Ag-MnOx/C-300). The Ag-MnOx/C-300 sample shows the highest activity toward the ORR, with the half-wave potential of the ORR shifting negatively only 0.035 V compared to that on the commercial 40 wt. % Pt/C (JM). The electron transfer number during the ORR on the Ag-MnOx/C composite increases with the value close to four after the heat treatment at 300 degrees C, which is mainly attributed to the formation of Ag(0), rather than Mn3O4. The heat treatment brings about a better catalytic stability of the composite, and no obviously negative shift takes place for the half-wave potential of the ORR on the Ag-MnOx/C-300 composite after 1000 cycles accelerated aging test. The maximum power density of the zinc-air battery with the Ag-MnOx/C-300 air electrode reaches up to 130 mW cm(-2), higher than those based on the Pd/C and Pt/C cathode catalysts, which shows that the Ag-MnOx/C-300 composite is a promising candidate as the catalyst for the air electrode. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: CATALYSTS ;  NANOPARTICLES ;  ELECTRODES ;  CELLS ;  DECOMPOSITION ;  SELENIDES ;  OXIDATION ;  PLATINUM ;  PT/C
语种: 英语
WOS记录号: WOS:000334898800021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145456
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, Dalian 116023, Peoples R China
2.Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

Recommended Citation:
Wu, Qiumei,Jiang, Luhua,Qi, Luting,et al. Electrocatalytic activity and stability of Ag-MnOx/C composites toward oxygen reduction reaction in alkaline solution[J]. ELECTROCHIMICA ACTA,2014,123:167-175.
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