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(1-5-1, Tenjin-cho, Kiryu-shi, Gunma 376-8515) **Ecology and Energy system R/D center , Sanyo Electric Co., Ltd.(1-1-1, Sakata, Oizumi-machi, Oura-gun, Gunma 370-0596)As relates to an anode and a cathode, a life test of about 2000 hrs has been conducted with a single cell using an anode that has improved catalyst material.As relates to the improved cathode durability, the relationship between the types of carbon supports for the cathode catalyst and the cell characteristics was investigated. If the dibutyl phthalate (DBP) absorption value increases, the O2 gain tends to decrease. Results indicate that gas diffusion increases with use carbon supports having DBP absorption value (a highly developed carbon support structure).