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题名: One step synthesis of carbon-supported Ag/MnyOx composites for oxygen reduction reaction in alkaline media
作者: Tang, Qiwen1, 2;  Jiang, Luhua1;  Qi, Jing1, 2;  Jiang, Qian1, 2;  Wang, Suli1;  Sun, Gongquan1
关键词: Oxygen reduction reaction ;  Alkaline media ;  Manganese oxide ;  Silver ;  One step synthesis
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2011-05-18
DOI: 10.1016/j.apcatb.2011.03.007
卷: 104, 期:3-4, 页:337-345
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Carbon-supported Ag/MnyOx composites were prepared by a one step synthesis method, i.e., silver permanganate pyrolysis at different temperatures. The physical and electrochemical properties of the obtained composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and cyclic voltammetry (CV). The electrochemical activity, selectivity and stability for the Ag/MnyOx/C composites toward oxygen reduction reaction (ORR) in alkaline media were investigated by rotating (ring)-disk electrode (R(R)DE) technique. The XRD results show that the manganese oxides were converted from MnO2 to Mn3O4 and then to MnO gradually with increasing temperature. Among all the Ag/MnyOx/C composites, Ag/Mn3O4/C obtained at 400 degrees C exhibits the highest activity toward the ORR. Compared with the Ag/C, Mn3O4/C and the physical mixture of Ag/C and Mn3O4/C with the same metal loadings, the ORR activity of the Ag/Mn3O4/C is improved significantly, suggesting a synergic effect between Ag and Mn3O4. At an overpotential of 0.35 V. the calculated apparent activation energy for the ORR on the Ag/Mn3O4/C catalyst is 56 kJ mol(-1), which is apparently higher than that on a Pt/C catalyst (36 kJ mol(-1)). The results from both Koutecicy-Levich plots of the ORR and the RRDE measurements suggest that the ORR proceeds via a 4-electron pathway on the Ag/Mn3O4/C composite. Moreover, the presence of methanol has little influence on the ORR activity toward the Ag/Mn3O4/C catalyst. The accelerated aging tests indicate that the Ag/Mn3O4/C is more stable than the Pt/C in 0.1 M NaOH solution. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
关键词[WOS]: MANGANESE OXIDES ;  PLATINUM NANOPARTICLES ;  AIR CATHODE ;  FUEL-CELLS ;  CATALYSTS ;  OXIDATION ;  ELECTRODE ;  METHANOL ;  ELECTROCATALYSIS ;  NANOSTRUCTURES
语种: 英语
WOS记录号: WOS:000291182100018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142506
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, Direct Alcohol Fuel Cell Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 10049, Peoples R China

Recommended Citation:
Tang, Qiwen,Jiang, Luhua,Qi, Jing,et al. One step synthesis of carbon-supported Ag/MnyOx composites for oxygen reduction reaction in alkaline media[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2011,104(3-4):337-345.
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