Nanofiber Electrodes for High Power PEM Fuel Cells

摘要

Very high power was produced from membrane-electrode-assemblies (MEAs) with a Nafion 212 membrane and an electrospun nanofiber cathode that were prepared with Johnson-Matthey (JM) HiSpec? 4000 catalyst. At a cathode Pt loading of 0.064 mg/cm~2, the maximum power density for H_2/air fuel cell operation at 80°C and ambient pressure was 538 mW/cm~2. Fuel cell operation at two temperatures (60°C and 80 °C), backpressures up to 2.0 atmospheres, and a variety of gas feed flow rates was investigated. An electrospun cathode with a Pt loading of 0.055 mg/cm produced a maximum power density of 906 mW/cm~2 at 80°C, 2000 seem fully humidified air, and a backpressure of 2 atm.