期刊
ELECTROCHIMICA ACTA
卷 109, 期 -, 页码 238-244出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.07.157
关键词
Hollow carbon sphere; PtRu nanoparticle; Electrooxidation; Direct methanol fuel cell
资金
- Program for NSFC [51272219]
- RFDP [20124301110006]
- International Joint Research Program of Hunan Province [2013WK3036]
- Open Project of Hunan Provincial University Innovation Platform [12K050]
- Construct Program of the Key Discipline in Hunan Province
In this paper, discrete and highly dispersible hollow carbon spheres (HCSs) were prepared by using a confined nanospace pyrolysis method, in which the polystyrene latex particles were step-wisely coated with a phenol-formaldehyde polymer inner shell and a silica outer shell, and monodisperse HCSs were obtained after pyrolysis of this spherical composite and subsequent elimination of the outer silica shell. The electrocatalysts, PtRu nanoparticles supported on HCSs, were prepared by the impregnation and reduction method with sodium borohydride. Uniform and well-dispersed PtRu nanoparticles with a narrow particle size distribution were observed and depended on the total metal loadings. The electrooxidation of methanol on the supported catalysts was investigated at room temperature by electrochemical impedance spectroscopy, chronoamperometry, and cyclic voltammetry, and the results showed that the catalyst with PtRu loading of 15.75 wt% possessed the highest catalytic activity than the other PtRu catalysts. (C) 2013 Elsevier Ltd. All rights reserved.
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