FUEL CELL, AND GAS DIFFUSION LAYER USED THEREFOR
PROBLEM TO BE SOLVED: To increase the capacity of supplying gas through a gas diffusion layer to a catalyst electrode region corresponding to a rib of a groove-like flow path.SOLUTION: A fuel cell according to the present invention comprises: a membrane-electrode assembly having an electrode formed...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To increase the capacity of supplying gas through a gas diffusion layer to a catalyst electrode region corresponding to a rib of a groove-like flow path.SOLUTION: A fuel cell according to the present invention comprises: a membrane-electrode assembly having an electrode formed on each face of an electrolyte membrane; a pair of gas diffusion layers disposed so as to hold therebetween the membrane-electrode assembly; and a pair of separators disposed so as to hold therebetween the membrane-electrode assembly and the pair of gas diffusion layers. At least one separator of the pair of separators has a groove-like main flow path on a surface which is in contact with the corresponding one of the gas diffusion layers. The one gas diffusion layer is composed of a metal artifact having, in plane view, a maximum permeation direction in which permeation of a gas becomes a maximum, and is arranged so that the maximum permeation direction forms an angle of 90±30° with respect to the direction of the separator main flow path.SELECTED DRAWING: Figure 4
【課題】溝状の流路のリブに対応する触媒電極の領域へのガス拡散層を介したガスの供給能力を向上させる。【解決手段】発明の燃料電池は、電解質膜の両面に電極が形成された膜電極接合体と、膜電極接合体を挟持するように配置された一対のガス拡散層と、膜電極接合体及び一対のガス拡散層を挟持するように配置された一対のセパレーターと、を備える。一対のセパレーターのうち、少なくとも一方のセパレーターは、対応する一方のガス拡散層に接する面に溝状の主流路を有している。一方のガス拡散層は、平面視においてガスの透過率が最も大きな方向である最大透過方向を有する金属加工体で構成されており、最大透過方向が、セパレーターの主流路の方向に対して90°±30°の角度をなすように配置されている。【選択図】図4 |
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