DEVELOPMENT OF ONE CHAMBER TYPE METHANE-AIR FUEL CELL BASED ON PROTON CONDUCTING OXIDE ELECTROLYTE

以固体氧化物电解液Ce&lt；0.8&gt；Sm&lt；0.2&gt；O&lt；1.9&gt；为基础，构建了单腔式甲烷-空气燃料电池。基于Ce_&lt；0.8&gt；Sm_&lt；0.2&gt；O_&lt；1.9&gt；电解质的燃料电池的伏安性能明显优于基于钙钛矿型固体电解质的同类电池，如BaZr_&lt；0.8&gt；Y_&lt；0.2&gt；O_&lt；2.9&gt；以0.3 mm厚Ce&lt；0.8&gt；Sm&lt；0.2&gt；O&lt；1.9&gt；电解液为基础的燃料电池在700℃和750℃下分别产生100 mA和175 mA的电流。在甲烷-空气燃料电池中，甲烷热分解导致的阳极表面积碳是一个严重的问题。在负极组件上涂覆1%Ru/Al_2O_3催化剂，防止了积碳，保持了甲烷-空气燃料电池的稳定性。

Based on a solid oxide electrolyte, Ce_<0.8>Sm_<0.2>O_<1.9>, one chamber type methane-air fuel cells have been constructed. Fuel cells based on a Ce_<0.8>Sm_<0.2>O_<1.9> electrolyte gave current-voltage performances significant better than those of a comparable cell based on a perovskite solid electrolyte such as BaZr_<0.8>Y_<0.2>O_<2.9>. The performance of fuel cells were governed by the catalytic activity of the both electrode and the conductivity of the electrolyte.The fuel cells based on Ce_<0.8>Sm_<0.2>O_<1.9> electrolyte of 0.3 mm thickness generated 100 and 175 mA at a terminal voltage of 500 mV at temperatures of 700 and 750 ℃, respectively. In the methane-air fuel cell, the carbon deposition on the anode surface coming from the thermal decomposition of methane was serious problem. The coating of 1%Ru/Al_2O_3 catalysts coating on the anode component prevented the carbon deposition and maintained the stability of the methane-air fuel cell.