| 摘要 |
A catalyst layer that has good long-term water resistance and in which outflow of the hydrophobizing agent present on the catalyst layer surface is prevented, a membrane electrode assembly, a fuel cell, and a method for manufacturing a catalyst layer. The first aspect of the present invention relates to a catalyst layer having a catalyst structural body including platinum and gold, a proton conductive electrolyte, and a siloxane polymer having a hydrophobic group and a group including -SH, wherein a sulfur atom of the group including -SH of the siloxane polymer and the gold of the catalyst structural body are bound by a thiol bond.
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