The polarization characteristics and the thickness of the catalyst layers in fuel cell electrodes.

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概要

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• The polarization characteristics of poly(tetrafluoroethylene)-bonded Raney nickel hydrogen- and silver oxygen-electrodes have been measured as a function of the thickness of the catalyst layer, and the polarization curves of these electrodes have been analyzed on the basis of the electrolyte film model. The observed polarization curves were divided into several segments and a linear polarization-current equation, derived from the model, has been applied to each segment. The performance of the electrodes approaches asymptotically to an upper limit with the thickening of the catalyst layers. The profiles of the faradayic current density across the electrode wall have been estimated for both electrodes. In contrast with the almost flat profiles of the Raney nickel electrodes, the current densities for the silver electrodes are localized on the liquid side of the electrodes; a thin area of the catalyst layer ranging from the electrode-face/electrolyte interface to 5.3×10<SUP>−3</SUP>cm distance sustains most of the load current at a polarization of 220 mV. The catalytic activities of both the silver and Raney nickel catalysts are enhanced with progression of the polarization while the resistivities of the electrolyte film maintained essentially constant. A slight surface oxidation for the Raney nickel and a surface reduction for the silver catalysts have been suggested as probable explanations for the enhanced catalytic activities observed.

• 公益社団法人 日本化学会の論文

著者

• Nakajima Noriyuki

  Department of Applied Science for Energy, Faculty of Engineering, Muroran Institute of Technology

• Kenjo Tadao

  Department of Applied Science for Energy, Faculty of Engineering, Muroran Institute of Technology

関連論文

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• The polarization characteristics and the thickness of the catalyst layers in fuel cell electrodes.
• PTFE-bonded Raney nickel hydrogen electrodes in alkaline fuel cells.

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