Patent ID: 8377601
Filing Date: 2013-02-19
Classification: H01M,Y02E

Abstract:
1. A direct oxidation fuel cell comprising: a membrane electrode assembly including an anode, a cathode, and an electrolyte membrane interposed between said anode and said cathode; an anode-side separator having a fuel flow channel for supplying fuel to said anode; and a cathode-side separator having an oxidant flow channel for supplying oxidant to said cathode, wherein said anode includes an anode catalyst layer disposed at the side of said electrolyte membrane and an anode diffusion layer disposed at the side of said anode-side separator, said anode diffusion layer includes: a conductive water repellent layer disposed at the side of said anode catalyst layer and including a first conductive agent and a first water repellent agent; and a substrate layer disposed at the side of said anode-side separator, said conductive water repellent layer is disposed between said substrate layer and said anode catalyst layer, and said substrate layer includes a conductive porous material and a second water repellent agent, the content of said second water repellent agent included in said substrate layer being lower at the downstream side than at the upstream side of the fuel flow, whereby the porosity of said substrate layer is higher at the downstream side than at the upstream side of the fuel flow.