C211 固体高分子形燃料電池触媒層のAFM計測(OS-5:燃料電池関連研究の新展開(I))

概要

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To improve energy efficiency with reduction of cost in polymer electrolyte fuel cells (PEFCs), optimization of PEFC electrode structure with sufficient oxygen, proton and electro supply is of great importance. Visualization of current path in catalyst layer (CLs) gives us a fruitful insight to understand the structure and mechanism of electrodes. In this study, PEFC electrodes were investigated using atomic force microscopy (AFM). We measured modeled catalyst layers deposited on stainless substrate using current sensing AFM to investigate distribution of electric current across the CLs. The conductive area decreased with ionomer content and current percolation limit was 75-80wt.% ionomer content. We also conducted AFM visualization of cross section of electrodes that was prepared by cross sectional polishing (CP) to investigate nano-scale structure of catalyst layer. It was shown that the carbon agglomerates were 35-70nm in diameter.
2010-10-29