GAS DIFFUSION LAYER AND SOLID POLYMER TYPE FUEL CELL

• Main Authors: HIROSE HIROSHI, MIZUNO SATOYUKI, KATO SATORU, NAGAI YASUTAKA, KATO AKIHIKO, YAMAGUCHI SATOSHI
• Format: Patent
• Language: English; Japanese
• Published: 22.10.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a gas diffusion layer in which gas diffusion resistance is low even during heavy load, and to provide a solid polymer type fuel cell using the same.SOLUTION: A gas diffusion layer includes a backing material composed of a porous conductive material (A), and a water repellent layer formed on one surface of the backing material, and containing conductive particles composed of a conductive material (B) and a water repellent material. The water repellent layer includes multiple open holes having a diameter d of 20 to 60 μm, and an interval p of 0.16 to 1.0 mm. The backing material has a thickness t of 70 to 300 μm. Furthermore, the gas diffusion layer has an α value (=(d/2(mm))1.2×D(mm-2)×(t(mm))-0.5, D(mm-2) is number density of the open holes) of 0.79 to 32.SELECTED DRAWING: Figure 3 【課題】高負荷時においてもガス拡散抵抗の低いガス拡散層、及びこれを用いた固体高分子形燃料電池を提供すること。【解決手段】ガス拡散層は、多孔質の導電性材料（Ａ）からなる基材と、前記基材の一方の面に形成された、導電性材料（Ｂ）からなる導電性粒子と撥水性材料とを含む撥水層とを備えている。前記撥水層は、直径ｄが２０μｍ超６０μｍ以下であり、間隔ｐが０．１６ｍｍ以上１．０ｍｍ以下である複数の貫通穴を備えている。基材は、厚さｔが７０μｍ以上３００μｍ以下である。さらに、ガス拡散層は、α値（＝(ｄ／２[ｍｍ])1.2×Ｄ[ｍｍ-2]×(ｔ[ｍｍ])-0.5、Ｄ[ｍｍ-2]は、前記貫通孔の数密度）が０．７９以上３２以下である。【選択図】図３