Effects of Carbon Dioxide on the Performance of Anion-Exchange Membrane Fuel Cells
Effects of Carbon Dioxide on the Performance of Anion-Exchange Membrane Fuel Cells
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DOI：
10.5796/electrochemistry.79.322
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发表时间：
2011-05-01
期刊：
影响因子：
2.5
通讯作者：
Yanagi, Hiroyuki
中科院分区：
文献类型：
--
作者：
Inaba, Minoru;Matsui, Yu;Yanagi, Hiroyuki
使用配备参比电极的三电极单电池研究了 CO2 对阴离子交换膜燃料电池性能的影响。尽管在 CO2 存在的情况下，通过自净化机制，膜电阻在高电流密度下降低，但电池电压明显低于纯 O-2，特别是在低电流密度下，甚至在 100 ppm 的极低 CO2 浓度下。 CO2 的存在几乎不改变阴极的过电势，而 CO2 的存在则显着增加阳极的过电势。结果表明，运行过程中，碳酸根/碳酸氢根离子在阳极积聚，降低了阳极催化剂层的离子电导率和pH值，导致阳极产生较高的过电势。
The effects of CO2 on the performance of an anion-exchange membrane fuel cell were investigated using a three-electrode single cell equipped with a reference electrode. Though the membrane resistance decreased at high current densities in the presence of CO2 via the self-purging mechanism, the cell voltage was significantly lower than that for pure O-2 especially at low current densities even at a very low CO2 concentration of 100 ppm. The overpotential at the cathode was hardly changed by the presence of CO2, while that at the anode significantly increased in the presence of CO2. It was concluded that carbonate/bicarbonate ions accumulated at the anode during operation, and reduces the ionic conductivity and the pH in the anode catalyst layer, which results in a high overpotential at the anode.