| 摘要 |
Provided is a fuel cell, the output voltage of which is improved by uniforming a membrane moist state. An anode-side gas diffusion layer (12) and a cathode-side gas diffusion layer (14) are joined to a membrane electrode assembly (10), and a separator (20) is joined to the anode-side gas diffusion layer (12). The separator (20) has a recess portion (22) and a protrusion portion (24) formed to constitute a gas flow path and a refrigerant flow path, respectively. The cross-sectional area of the recess portion (22) is made relatively small at the downstream in comparison with that at the upstream, and the cross-sectional area of the protrusion portion (24) is made relatively large at the downstream in comparison with that at the upstream, thereby improving the moist state. |
