酸素消光性燐光染料を用いたPEFC内酸素濃度分布の解析 : 基本特性の検討と拡散層上部酸素濃度分布の計測(熱工学,内燃機関,動力など)

概要

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A measuring technique of oxygen concentration distribution on the gas diffusion layers (GDLs) along the cathode gas flow channels in polymer electrolyte fuel cells (PEFCs) has been developed. Oxygen quenching phosphorescent paint prepared by dissolving dye (PtTFPP) and binder in toluene is sprayed by air on a GDL, which is installed in a transparent PEFC, and excited by ultraviolet light. The phosphorescence of the GDL is measured with a CCD camera having an image intensifier through a 650nm sharp cut color filter. Stern-Volmer coefficients K_<sv> under the operating condition (in-situ) are estimated from phosphorescent intensity for no oxygen quenching I_0 with nitrogen gas supplied in the cathode and that for oxygen quenching I with air in the cathode at open circuit voltage. By obtaining K_<sv> at each measuring point, the irregularity of the air spray painting and the error due to product water wetting are cancelled. Measured oxygen concentration distribution deviates from the theoretical values at some characteristic points, suggesting cathode gas short cut between the separator rib and GDL.
社団法人日本機械学会の論文
2008-01-25