科研之友
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摘要
Accelerated degradation tests (ADTs) for the H-2/air single cell are carried out at 65 degrees C and ambient pressure by cycling the cell between 0 and 200 mA cm(-2) up to 6000 cycles. Membrane electrode assemblies (MEAs) are prepared using the Nation 212 membrane and the carbon supported platinum as an anode catalyst, as well as the carbon supported Ru85Se15 as a cathode catalyst prepared with five selected Nation contents and Ru loads to represent the optimized (33% Nation and 0.27 mg Ru cm(-2)), overloaded (43% Nation and 0.61 mg Ru cm(-2)) and underloaded (20% Nation and 0.14 mg Ru cm(-2)) conditions. The lowest cell performance loss of 44% in terms of peak power density is achieved with 33% Nation and 0.27 mg Ru cm(-2). Very severe losses of 80% and 82% are found for 20% and 43% Nation contents, respectively, while relatively moderate losses of 57% and 64% for 0.14 and 0.61 mg Ru cm(-2), respectively. Dissolution and migration of Se/Ru and corrosion of carbon support from the catalyst, together with the shrinkage and release of sulfonic acid from the membrane are identified and correlated to decayed cell performances.
- 出版日期2012-11-15
- 单位厦门大学
