期刊
JOURNAL OF POWER SOURCES
卷 199, 期 -, 页码 22-28出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.09.107
关键词
Carbide-derived carbon; Novel support material; Catalyst; Direct methanol fuel cell
资金
- Energy Research Centre of Lower Saxony (Energie-Forschungszentrum Niedersachsen)
- German Research Council (DFG)
The improvement of direct methanol fuel cells (DMFCs) requires the development of highly active catalysts. Carbide-derived carbon (CDC) is a new class of carbon materials which are produced via selective extraction of the non-carbon compounds from metal carbides. Nanoporous carbon with a surface area of 906 m(2) g(-1) and mean pore size of 3.4 nm was produced in consequence of chlorinating pure titanium carbide. This material was oxidatively treated to create the nucleation sites for the metal precursor. An increase of oxygen content in the carbon sample was observed after the functionalization step. The CDC material was subsequently loaded with 18.62 wt.% platinum, with an average particle size of 1.16 nm, by wet impregnation and chemical reduction. As a result, an enhanced electrochemical activity towards oxygen reduction was observed. The maximum power density of 50.16 mW cm(-2) was achieved and is subsequently 18% higher than the value measured for commercial platinum catalyst (20 wt.% Pt) on activated carbon. This increase can be attributed to good catalyst dispersion, high surface area and small platinum cluster sizes, thus, confirming the potential of carbide-derived carbon supported catalysts for DMFC applications. (C) 2011 Elsevier B.V. All rights reserved.
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