FUEL CELL GAS DIFFUSION LAYER

To provide a fuel cell gas diffusion layer improved in drainage while maintaining gas diffusion properties.SOLUTION: A fuel cell gas diffusion layer includes: a gas diffusion base material comprising a conductive porous body; and a porous and conductive water repellent layer formed on the gas diffus...

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Bibliographische Detailangaben
Hauptverfasser: MIZUNO SATOYUKI, KAWAKADO AKITO, KATO SATORU, HONJO TAKAHIDE, YAMAMOTO HIDENARI, NAGAI YASUTAKA, MURANAKA TAKUYA, SEKIYA AKIHITO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a fuel cell gas diffusion layer improved in drainage while maintaining gas diffusion properties.SOLUTION: A fuel cell gas diffusion layer includes: a gas diffusion base material comprising a conductive porous body; and a porous and conductive water repellent layer formed on the gas diffusion base material. In the water repellent layer, a ratio D/Dof a maximum value Dof volumes of pores having diameters in the range of 0.01-0.5 μm to a volume Dof pores having a diameter of 1 μm in a pore distribution measured using a mercury porosimeter is 0.27 or more.SELECTED DRAWING: Figure 1 【課題】ガス拡散性を維持しつつ、排水性を向上させた燃料電池用ガス拡散層を提供する。【解決手段】導電性多孔体から構成されるガス拡散基材と、前記ガス拡散基材上に形成され、多孔質かつ導電性の撥水層と、を備える燃料電池用ガス拡散層であって、前記撥水層は、水銀ポロシメーターを用いて測定した細孔分布において、細孔直径0.01〜0.5μmの範囲における細孔容積の最大値Dmaxと、細孔直径1μmにおける細孔容積D1との比、D1/Dmaxが0.27以上である、燃料電池用ガス拡散層。【選択図】図1