کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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193638 | 459775 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Characterization and performances of cobalt–tungsten and molybdenum–tungsten carbides as anode catalyst for PEFC Characterization and performances of cobalt–tungsten and molybdenum–tungsten carbides as anode catalyst for PEFC](/preview/png/193638.png)
The preparation of carbon-supported cobalt–tungsten and molybdenum–tungsten carbides and their activity as an anode catalyst for a polymer electrolyte fuel cell were investigated. The electrocatalytic activity for the hydrogen oxidation reaction over the catalysts was evaluated using a single-stack fuel cell and a rotating disk electrode. The characterization of the catalysts was performed by XRD, temperature-programmed carburization, temperature-programmed reduction and X-ray photoelectron spectroscopy. The maximum power densities of the 30 wt% 873 K-carburized cobalt–tungsten and molybdenum–tungsten mixed with Ketjen carbon (cobalt–tungsten carbide (CoWC)/Ketjen black (KB) and molybdenum–tungsten carbide (MoWC)/KB) were 15.7 and 12.0 mW cm−2, respectively, which were 14 and 11%, compared to the in-house membrane electrode assembly (MEA) prepared from a 20 wt% Pt/C catalyst. The CoWC/KB catalyst exhibited the highest maximum power density compared to the MoWC/KB and WC/KB catalysts. The 873 K-carburized CoW/KB catalyst formed the oxycarbided and/or carbided CoW that are responsible for the excellent hydrogen oxygen reaction.
Journal: Electrochimica Acta - Volume 54, Issue 4, 30 January 2009, Pages 1255–1262