Improvement in high temperature proton exchange membrane fuel cells cathode performance with ammonium carbonate
Improvement in high temperature proton exchange membrane fuel cells cathode performance with ammonium carbonate
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DOI：
10.1016/j.jpowsour.2004.09.021
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发表时间：
2005-03
影响因子：
9.2
通讯作者：
Ying Song;Yuanyuan Wei;Hui Xu;Minkmas V. Williams;Yuxiu Liu;L. Bonville;H. Kunz;J. Fenton
中科院分区：
文献类型：
--
作者：
Ying Song;Yuanyuan Wei;Hui Xu;Minkmas V. Williams;Yuxiu Liu;L. Bonville;H. Kunz;J. Fenton
具有优化的阴极结构的质子交换膜（PEM）燃料电池可以在较高温度（120°C）下提供高性能。在高温膜电极组件的无载体Pt阴极催化剂层中应用的“成孔”材料碳酸铵增强了催化剂活性并使传质限制最小化。阴极中的碳酸铵量和Nafion®负载针对两种条件下的性能进行了优化：80°C电池温度，100%阳极/75%阴极R.H.和120°C电池温度，35%阳极/35%阴极R.H.，都是在环境压力下。具有20 wt.%碳酸铵和20 wt.%在80°C和120°C下运行的Nafion®电池表现出最佳性能。使用Ionomem/UConn膜作为电解质，阴极铂负载量为0.5mgcm− 2，在400 mAcm − 2电流密度下的氢/空气电池电压在两种条件下分别为0.70V和0.57V。这是在120°C操作条件下，相对于没有“成孔”碳酸铵的阴极，19%的电池电压增加。
Proton exchange membrane (PEM) fuel cells with optimized cathode structures can provide high performance at higher temperature (120°C). A “pore-forming” material, ammonium carbonate, applied in the unsupported Pt cathode catalyst layer of a high temperature membrane electrode assembly enhanced the catalyst activity and minimized the mass-transport limitations. The ammonium carbonate amount and Nafion®loading in the cathode were optimized for performance at two conditions: 80°C cell temperature with 100% anode/75% cathode R.H. and 120°C cell temperature with 35% anode/35% cathode R.H., both under ambient pressure. A cell with 20wt.% ammonium carbonate and 20wt.% Nafion®operating at 80°C and 120°C presented the maximum cell performance. Hydrogen/air cell voltages at a current density of 400mAcm−2using the Ionomem/UConn membrane as the electrolyte with a cathode platinum loading of 0.5mgcm−2were 0.70V and 0.57V at the two conditions, respectively. This was a 19% cell voltage increase over a cathode without the “pore-forming” ammonium carbonate at the 120°C operating condition.