Evaluation study of PEFC single cell with a view to commercializing the PEFC cogeneration system

摘要

Durability of Membrane Electrode Assemblies (MEAs) have been evaluated using a fuel gas of CO (10 ppm)/CO_2 (20 percent)/H_2 (Balance) at a constant current density of 300 mAcm~(-2), the cell temperature of 70 deg C. Mitsubishi Electric's MEA using Aciplex~R S-1002 as the electrolyte showed small degradation rates of ca. 2/1,000 h over 10,000 h at 60 percent fuel utilization (Uf) under near saturated humidification condition. Japan Gore-Tex's MEA, which had been newly developed to improve the durability, has been evaluated under a low humidification condition at 60 percent Uf. Although the stable voltage was lower than that under the high humidification condition, the degradation rate was several mV/1,000 h even under the low humidification condition. 3 M's MEA showed stable voltage and small degradation rate of ca. 3 mV/1,000 h at high Uf of 80 percent and near saturated humidification condition by using modified separator that the gas channel shape was changed to increase the gas linear velocity.