The CO poisoning effect in PEMFCs operational at temperatures up to 200°C
The CO poisoning effect in PEMFCs operational at temperatures up to 200°C
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DOI：
10.1149/1.1619984
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发表时间：
2003-12-01
影响因子：
3.9
通讯作者：
Bjerrum, NJ
中科院分区：
文献类型：
--
作者：
Li, QF;He, RH;Bjerrum, NJ
在以磷酸掺杂的聚苯并咪唑膜为电解质的情况下，研究了一氧化碳（CO）对碳载铂催化剂（每个电极上铂的负载量为0.5毫克/平方厘米）在聚合物电解质膜燃料电池（PEMFCs）中的中毒效应，温度范围为125℃到200℃。该效应与温度密切相关，在高温下可被充分抑制。通过将一氧化碳耐受性定义为电压损失小于10毫伏，经评估，在200℃时，氢气中含3%的一氧化碳在电流密度高达0.8安/平方厘米的情况下是可以耐受的，而在125℃时，氢气中含0.1%的一氧化碳在电流密度低于0.3安/平方厘米的情况下是可以耐受的。作为对比，在80℃时，电流密度高达0.2安/平方厘米的情况下，耐受性仅为0.0025%的一氧化碳（25ppm）。计算了氢氧化的相对阳极活性随一氧化碳浓度和温度的变化关系。还研究了氢气中二氧化碳的影响。在175℃时，燃料流中25%的二氧化碳仅显示出稀释效应。（C）2003，美国电化学会。
The CO poisoning effect on carbon-supported platinum catalysts (at a loading of 0.5 mg Pt/cm(2) per electrode! in polymer electrolyte membrane fuel cells (PEMFCs) has been investigated in a temperature range from 125 to 200 degreesC with the phosphoric acid-doped polybenzimidazole membranes as electrolyte. The effect is very temperature-dependent and can be sufficiently suppressed at elevated temperature. By defining the CO tolerance as a voltage loss less than 10 mV, it is evaluated that 3% CO in hydrogen can be tolerated at current densities up to 0.8 A/cm(2) at 200 degreesC, while at 125 degreesC 0.1% CO in hydrogen can be tolerated at current densities lower than 0.3 A/cm(2). For comparison, the tolerance is only 0.0025% CO (25 ppm) at 80 degreesC at current densities up to 0.2 A/cm(2). The relative anode activity for hydrogen oxidation was calculated as a function of the CO concentration and temperature. The effect of CO2 in hydrogen was also studied. At 175 degreesC, 25% CO2 in the fuel stream showed only the dilution effect. (C) 2003 The Electrochemical Society.