A Nafion-silica cathode electrolyte for durable elevated-temperature direct methanol fuel cells

作者：Lei M; Wang S L; Li L H; Tang W H^*

来源：Journal of Power Sources, 2011, 196(3): 1123-1126.

DOI：10.1016/j.jpowsour.2010.08.050

• Catalyst layer
• Water retention
• Silica
• Self-assembly
• Performance

A novel catalyst layer assisted by a Nafion-silica electrolyte for elevated-temperature direct methanol fuel cells fabricated through a self-assembly process. The catalyst layer domenstrates good water retention abilities and structural stability during the fuel cell operation. After a dehydration period of 30 min under 25% relative humidity at 100 degrees C, the proton conductivity of the novel catalyst layer is maintained at similar to 0.014S cm(-1), and the single cell assembled with the novel catalyst layer achieves a maximum power density of 108mWcm(-2). Moreover, a stability operation test conducted under 20ppm CO and a current density of 100mA cm(-2) demonstrates the structural stability and water retention abilities of the catalyst layer. The cell voltage of a fuel cell featuring the novel catalyst layer decreases from 0.45 to 0.38V at a slight degradation rate of 0.6 mV min(-1.

• 出版日期2011-2-1
• 单位浙江理工大学