Analysis of Oxygen Reduction Reaction Activity of Pt/C Catalysts for Actual PEFC MEAs
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概要
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The dependence of the oxygen reduction reaction (ORR) activity of Pt/C catalysts used in actual polymer electrolyte fuel cell membrane electrode assemblies (PEFC MEAs) on cell temperature, O2 partial pressure and catalyst loading has been investigated. Based on physical chemistry and electrochemistry points of view, the charge transfer coefficient (α) was demonstrated to vary with potential over a narrow range of 0.5–0.6. The double Tafel slope occurring at potentials above 0.8 V vs. RHE was considered to be caused by the effect of adsorption or reaction of oxygen-containing species sourced by water. As a result, the α was assumed constant at 0.5 irrespective of the potential, and used in the estimation of the ORR activity [A/cm2-Pt]. The ORR activity was observed to increase linearly with increasing temperature. It was also found to be dependent on O2 partial pressure (considered as O2 concentration) until it reached a plateau at an O2 concentration of 40%, and then remained almost constant. This finding implies that in gas-phase PEFC MEAs, adsorption of O2 as a reactant can influence and govern the electrochemical reaction. In addition, the ORR activity is demonstrated to be independent of the Pt/C ratio of the catalyst not only for Pt plate electrodes in liquid-phase systems, but also for MEA electrodes in the gas-phase system of actual single-cell PEFCs. The ORR activity was found to be almost constant at 2.6 × 10–6 A/cm2-Pt at 60°C for Pt/C ratios from 19.3 to 55.8 wt%.
- 2009-03-01
著者
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YAMAGUCHI Takeo
Department of Chemistry, Faculty of Science, Fukuoka University
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Yamaguchi Takeo
Tokyo Inst. Technol. Kanagawa Jpn
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Ito Taichi
Chemical Resources Laboratory Tokyo Institute Of Technology
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Ito Taichi
Department Of Chemical System Engineering The University Of Tokyo
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Yamaguchi Takeo
Department Of Chemical System Engineering The University Of Tokyo
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Ohashi Hidenori
Chemical Resources Laboratory, Tokyo Institute of Technology
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Yamaguchi Takeo
Chemical Resources Laboratory, Tokyo Institute of Technology
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LIMJEERAJARUS Nuttapol
Department of Chemical System Engineering, The University of Tokyo
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YANAGIMOTO Tatsunori
Department of Chemical System Engineering, The University of Tokyo
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YAMAMOTO Toshio
Polymer Laboratory, UBE Industries, Ltd.
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Yamaguchi Takeo
Chemical Resources Laboratory Tokyo Institute Of Technology
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Ohashi Hidenori
Chemical Resources Laboratory Tokyo Institute Of Technology
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Limjeerajarus Nuttapol
Department Of Chemical System Engineering The University Of Tokyo
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Ito Taichi
Center For Disease Biology And Integrative Medicine Department Of Bioengineering Faculty Of Medicine
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Yanagimoto Tatsunori
Department Of Chemical System Engineering The University Of Tokyo
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