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题名: Preparation of highly active 40 wt.% Pt/C cathode electrocatalysts for DMFC via different routes
作者: Zhou, ZH;  Zhou, WJ;  Wang, SL;  Wang, GX;  Jiang, LH;  Li, HQ;  Sun, GQ;  Xin, Q
关键词: Pt/C cathode electrocatalysts ;  DMFC ;  polyol process ;  aqueous impregnation method
刊名: CATALYSIS TODAY
发表日期: 2004-09-01
DOI: 10.1016/j.cattod.2004.06.121
卷: 93-5, 页:523-528
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: A series of 40 wt.% Pt/C electrocatalysts were prepared by a modified polyol process and an improved aqueous impregnation method with different impregnation time. The characterization results of TEM and XRD identically reveal that the size and distribution of Pt nanoparticles on carbon are controllable by modifying impregnation time in both routes. High dispersion of Pt nanoparticles on carbon is achieved by both methods with 15 min impregnation, while aggregation of Pt nanoparticles takes place with prolonging the impregnation time to 36 h, especially in the aqueous impregnation procedure. UV-vis spectroscopy measurements verified that the redox reaction between PtCl62- and formaldehyde could take place at a slow rate under ambient conditions via a two-step reaction path, where PtCl42- serves as an intermediate. On the other hand, PtCl62- anion can be directly reduced to Pt-0 above 333 K in the modified polyol process through an autocatalytic pathway. The short-time-impregnated 40 wt.% Pt/C as cathode electrocatalysts in direct methanol fuel cell performs better than that of long-time-impregnated electrocatalysts. Experimental evidence provides clues for fundamental understanding of elementary steps of the redox reactions, which helps guiding the design and preparation of highly dispersed Pt catalyst with high metal loadings for fuel cells. (C) 2004 Elsevier B.V. All rights reserved.
关键词[WOS]: SUPPORTED PLATINUM CATALYSTS ;  FUEL-CELLS ;  METHANOL ;  SIZE ;  OXYGEN ;  ELECTROREDUCTION ;  REDUCTION ;  OXIDES ;  GROWTH
语种: 英语
WOS记录号: WOS:000223973200074
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139459
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 Methanol Fuel Cell Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Zhou, ZH,Zhou, WJ,Wang, SL,et al. Preparation of highly active 40 wt.% Pt/C cathode electrocatalysts for DMFC via different routes[J]. CATALYSIS TODAY,2004,93-5:523-528.
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