Construction of porous anode by sacrificial template for a passive direct methanol fuel cell
Construction of porous anode by sacrificial template for a passive direct methanol fuel cell
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牺牲模板法构建被动式直接甲醇燃料电池多孔阳极
DOI：
10.1016/j.jpowsour.2014.03.121
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发表时间：
2014-09
影响因子：
9.2
通讯作者：
Yang Hui
中科院分区：
文献类型：
--
作者：
Huang Qinghong;Jiang Jingjing;Chai Jieshi;Yuan Ting;Zhang Haifeng;Zou Zhiqing;Zhang Xiaogang;Yang Hui
在膜电极组件（MEA）阳极的催化层（CL）和微孔层（MPL）中简单地添加氧化镁（MgO）纳米颗粒作为牺牲造孔剂，导致多孔阳极结构的形成，从而大大提高被动式直接甲醇燃料电池的性能。在相同的PtRu（1：1）负载量为2.0 mg cm−2时，在25 °C和3 M甲醇溶液中，具有多孔CL和具有多孔MPL和CL的MEA分别表现出37.0和43.7 mW cm− 2的最大功率密度。当PtRu负载量降低到1.0 mg cm−2时，具有多孔MPL和CL的MEA的最大功率密度为约1.0 mg cm− 2。32.8 mW cm-2，甚至高于PtRu负载量为2.0 mg cm-2的常规MEA。新型MEA的性能改善可以归因于在阳极中形成多孔结构之后增加的电化学表面积、降低的电荷转移电阻以及甲醇的有效传质。本工作提供了一种非常简单但非常有效的方法来减少燃料电池中贵金属催化剂的用量。
Simple addition of magnesium oxide (MgO) nanoparticles as a sacrificial pore-former into the catalytic layer (CL) and micro-porous layer (MPL) in the anode of a membrane electrode assembly (MEA) leads to the formation of porous anodic structure, thus greatly enhancing the performance of a passive direct methanol fuel cell. At the same PtRu(1:1) loading of 2.0 mg cm−2, the MEAs with porous CL and with both porous MPL and CL exhibit the maximal power densities of 37.0 and 43.7 mW cm−2at a temperature of 25 °C and with 3 M of methanol solution, respectively. When the PtRu loading decreases to 1.0 mg cm−2, the maximum power density of an MEA with both porous MPL and CL is ca. 32.8 mW cm−2, which is even higher than that of a conventional MEA with a PtRu loading of 2.0 mg cm−2. The improved performance of the novel MEA can be ascribed to an increased electrochemical surface area, a decreased charge-transfer resistance as well as an efficient mass transfer of methanol after the formation of porous structure in the anode. The present work provides a very simple but very effective way to reduce the dosage of the noble metal catalysts for fuel cells.
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