| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrode structure in which platinum is not used for a cathode and further a used amount of expensive ionomer is reduced.SOLUTION: The present invention relates to a cathode electrode structure used in a fuel cel, the cathode electrode structure containing a carbon catalyst and ionomer and satisfying the following expressions (1)-(3). 0.1<X/Y≤5 (1) 0.1≤X/Y<5 (2) 1.1≤(X/Y)/(X/Y)≤5 (3) (In the expressions, when X/Y is defined as a mass ratio between a carbon catalyst (X) and ionomer (Y) in an electrode structure, X/Yrepresents X/Y on one surface of the electrode structure and X/Yrepresents on another surface of the electrode structure.) |
