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Acta Physico-Chimica Sinica  2005, Vol. 21 Issue (10): 1156-1160    DOI: 10.3866/PKU.WHXB20051019
Note     
The Influence of Three Groups of Pt-Ru/C Catalyst’s Precursors on Its Performance for Direct Methanol Fuel Cell
WANG Zhen-bo; YIN Ge-ping; SHI Peng-fei
Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001
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Abstract  This research is aimed to increase the activity of platinum-ruthenium alloy (Pt-Ru/C) catalysts and thus to lower the catalyst loading in anodes for methanol electrooxidation. The direct methanol fuel cell (DMFC) anode catalysts, Pt-Ru/C, were prepared from three groups of precursors by thermal reduction. The phase structure, particle size, size distribution and the morphology of reduced catalysts were determined by means of high-resolution transmission electron microscopy (TEM) and X-ray diffraction (XRD). It is found that XRD patterns of all the catalysts show Pt reflexion of a face centered cubic (fcc) crystal structure. But there are diffraction peaks indicating the presence of either pure Ru or Ru-rich hexagonal close packed (hcp) phase, which is not alloyed with Pt in Pt-Ru/C catalysts prepared from (NH4)2PtCl6+Ru(OH)3, or H2PtCl6+RuCl3 as precursors. The catalyst prepared from Pt(NH3)2(NO2)2 and Ru compound of self- prepared as precursors had a more homogeneous distribution of Pt- Ru alloy in carbon and a small particle size of about 3.7 nm. Their performance was tested using a glassy carbon working electrode by cyclic voltammetry(CV), chronoamperometric and amperometric i-t curves in a solution of 0.5 mol•L-1 CH3OH and 0.5 mol•L-1 H2SO4 at 25 ℃. The electrocatalytic activity of Pt-Ru/C catalysts prepared from Pt(NH3)2(NO2)2 and Ru compound of self-prepared as precursors has the highest catalyticactivity for methanol electrooxidation. The peak current density in CV is 11.5 mA•cm-2.

Key wordsDMFC      Precursors      Pt-Ru/C catalyst      Methanol electrooxidation      Electrocatalytic activity     
Received: 05 January 2005      Published: 15 October 2005
Corresponding Authors: YIN Ge-ping     E-mail: yingphit@hit.edu.cn
Cite this article:

WANG Zhen-bo; YIN Ge-ping; SHI Peng-fei. The Influence of Three Groups of Pt-Ru/C Catalyst’s Precursors on Its Performance for Direct Methanol Fuel Cell. Acta Physico-Chimica Sinica, 2005, 21(10): 1156-1160.

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http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20051019     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2005/V21/I10/1156

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