A Cationic Contamination in PEFC Cathode: A Cause and Effect Study
A Cationic Contamination in PEFC Cathode: A Cause and Effect Study
复制标题
PEFC 阴极中的阳离子污染：因果研究
DOI：
10.1149/06624.0029ecst
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发表时间：
2015
影响因子：
9.2
通讯作者：
T. Molter
中科院分区：
文献类型：
--
作者：
Md. Aman Uddin;Jaehyun Park;S. Ganesan;U. Pasaogullari;L. Bonville;T. Molter
为了研究聚合物电解质燃料电池(PEFC)的阳离子污染，在长期耐久性试验前，先在钙溶液中污染催化剂涂层膜(CCM)。与未被污染的CCM相比，被污染的CCM的阴极催化层在CCM的整个活性区域上变得明显变薄。结果表明，阴极催化层中铂的总含量没有变化，唯一可能引起催化层厚度变化的元素是碳。由于在燃料电池试验过程中，阳离子倾向于在阴极催化层中积累，因此假设阳离子在催化层中的积累可以使铂失去活性，并直接或间接地增加碳氧化反应的速度，从而导致催化层变薄。
Cationic contamination in polymer electrolyte fuel cells (PEFC) is investigated by contaminating a catalyst coated membrane (CCM) in Ca 2+ solution prior to a long term durability test. The cathode catalyst layer of the contaminated CCM becomes significantly thinner over the entire active area of the CCM as compared to an as-received, uncontaminated CCM. It is found that there is no change in the total Pt content in cathode catalyst layer, and the only possible element loss that may cause significant catalyst layer thickness change is carbon. Since the cation tends to accumulate in the cathode catalyst layer during the fuel cell test, it is hypothesized that the cation accumulation in the catalyst layer can render the Pt inactive, and either directly or indirectly increases the carbon oxidation reaction rate resulting in catalyst layer thinning.