Effect of the thickness of the anode electrode catalyst layers on the performance in direct methanol fuel cells
Effect of the thickness of the anode electrode catalyst layers on the performance in direct methanol fuel cells
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DOI：
10.1016/j.jpowsour.2017.03.106
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发表时间：
2017-06-01
影响因子：
9.2
通讯作者：
Prakash, G. K. Surya
中科院分区：
文献类型：
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作者：
Glass, Dean E.;Olah, George A.;Prakash, G. K. Surya
对于大规模燃料电池制造，催化剂负载量和膜层厚度是影响膜电极组件（MEA）性能和成本的关键因素。研究了质子交换膜直接甲醇燃料电池（DMFC）阳极催化剂层厚度的影响。催化剂用刮涂法涂敷，厚度从1密耳到8密耳（1密耳= 25.4 μ m），Pt/Ru阳极负载量为0.25 mg cm-2到2.0 mg cm-2。与具有较薄层（1密耳和涂漆）的MEA相比，具有较厚的单个层（8密耳和4密耳）的MEA总体上表现更好。不同负载水平的峰值功率密度随着较高负载水平下Pt/Ru利用率的指数下降而变化。在2.0 mg cm-2催化剂负载量下，4密耳层达到的最高功率密度为49 mW cm-2，而在0.25 mg cm-2负载量下，8密耳层达到的最高归一化功率密度为116 mW mg-1。与0.25 mg cm-2和0.5 mg cm-2负载下的1 mil刮下相比，8 mil刮下显示出归一化功率密度分别增加50%和23%。(C)2017 Elsevier B. V.版权所有。
For the large scale fuel cell manufacture, the catalyst loading and layer thickness are critical factors affecting the performance and cost of membrane electrode assemblies (MEAs). The influence of catalyst layer thicknesses at the anode of a PEM based direct methanol fuel cell (DMFC) has been investigated. Catalysts were applied with the drawdown method with varied thicknesses ranging from 1 mil to 8 mils (1 mil = 25.4 mu m) with a Pt/Ru anode loading of 0.25 mg cm-2 to 2.0 mg cm-2. The MEAs with the thicker individual layers (8 mils and 4 mils) performed better overall compared to the those with the thinner layers (1 mil and painted). The peak power densities for the different loading levels followed an exponential decrease of Pt/Ru utilization at the higher loading levels. The highest power density achieved was 49 mW cm-2 with the 4 mil layers at 2.0 mg cm-2 catalyst loading whereas the highest normalized power density was 116 mW mg-1 with the 8 mil layers at 0.25 mg cm-2 loading. The 8 mil drawdowns displayed a 50% and 23% increase in normalized power density compared to the 1 mil drawdowns at 0.25 mg cm-2 and 0.5 mg cm-2 loadings, respectively. (C) 2017 Elsevier B.V. All rights reserved.