期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 34, 期 19, 页码 8193-8203出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2009.07.073
关键词
Pt catalysts; PEM fuel cell; Size effect; Vulcan XC-72; Dispersion
资金
- ANPCyT [PICT SU 35403, PAE 36985]
- CONICET [PIP 5977, PIP 5431]
- Universidad Nacional del Litoral
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
in this work nanoparticulated platinum catalysts have been prepared on carbon Vulcan XC-72 using three methods starting with chloroplatinic acid as a precursor: (i) formic acid as a reductor agent; (ii) impregnation method followed by reduction in hydrogen atmosphere at moderated temperature; and (iii) microwave-assisted reduction in ethylene glycol. The catalytic and size studies were also performed on a commercial Pt catalyst (E-Tek, De Nora). The characterization of the particle size and distribution was performed by means of transmission electron microscopy (TEM) and X-ray diffraction (XRD). The characterizations of the catalytic and electrocatalytic properties of the catalysts were determined by studying the cyclohexane dehydrogenation reaction (CHD) and the behavior under cyclic voltammetry (CV) in sulfuric acid solutions. The measured electrochemical activity, along with the hydrogen chemisorption of the catalysts allows the estimation of effective particle sizes, which are much larger than those measured by TEM and XRD. The catalysts prepared by reduction with formic acid and ethylene glycol (microwave-assisted) show electrochemical activities very close to those of the commercial catalyst, and are almost insensitive to the Pt dispersion or Pt particle size. The chemical activity in CHD correlates well with the metallic dispersion determined by hydrogen chemisorption, indicating similar accesibility, of H-2 and cyclohexane to the catalyst surface. (c) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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