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One step synthesis of carbon-supported Ag/MnyOx composites for oxygen reduction reaction in alkaline media
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
2011-05-18
DOI10.1016/j.apcatb.2011.03.007
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
关键词[WOS]MANGANESE OXIDES ; PLATINUM NANOPARTICLES ; AIR CATHODE ; FUEL-CELLS ; CATALYSTS ; OXIDATION ; ELECTRODE ; METHANOL ; ELECTROCATALYSIS ; NANOSTRUCTURES
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.
语种英语
WOS记录号WOS:000291182100018
引用统计
被引频次:66[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/142506
专题中国科学院大连化学物理研究所
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
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GB/T 7714
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.
APA Tang, Qiwen,Jiang, Luhua,Qi, Jing,Jiang, Qian,Wang, Suli,&Sun, Gongquan.(2011).One step synthesis of carbon-supported Ag/MnyOx composites for oxygen reduction reaction in alkaline media.APPLIED CATALYSIS B-ENVIRONMENTAL,104(3-4),337-345.
MLA Tang, Qiwen,et al."One step synthesis of carbon-supported Ag/MnyOx composites for oxygen reduction reaction in alkaline media".APPLIED CATALYSIS B-ENVIRONMENTAL 104.3-4(2011):337-345.
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