In-situ precise electrocatalytic behaviors of Pt/C and PtRu/C for methanol oxidation of DMFCs via the designed micro-MEA
In-situ precise electrocatalytic behaviors of Pt/C and PtRu/C for methanol oxidation of DMFCs via the designed micro-MEA
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通过设计的微型 MEA，Pt/C 和 PtRu/C 对 DMFC 甲醇氧化的原位精确电催化行为
DOI：
10.1016/j.ijhydene.2018.05.024
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发表时间：
2018-07-05
影响因子：
7.2
通讯作者：
Jin, Zhao
中科院分区：
文献类型：
--
作者：
Long, Zhi;Gong, Liyuan;Jin, Zhao
开发了改进的micro-MEA，并应用于Pt/C和PtRu/C的电催化性能评价。首先，与传统的玻璃碳电极（GCE）相比，micro-MEA表现出更低的起始电位和更高的峰值电流，这是因为micro-MEA有效地避免了硫酸氢离子在铂上的特异性吸附干扰，提高了燃料的传质性能。然后，评价了Nafion含量和甲醇浓度对Pt/C和PtRu/C的MOR性能的影响。结果表明，Pt/C在低浓度甲醇（0.5-1 M）中Nafion含量为30 wt%时性能最佳，而PtRu/C在Nafion含量为10 wt%时性能最佳，因为与Pt/C相比，Nafion含量更容易形成完整的质子通路和三相边界（TPB），这表明不同电催化剂的优化原位工作条件有显著差异。本文的研究表明，micro-MEA作为一种原位表征方法，可以更精确地表征接近工作状态的电催化剂的电催化性能，有利于电催化剂的筛选和在DMFC中的进一步应用。(C) 2018氢能源出版有限责任公司，由爱思唯尔有限公司出版。版权所有。
Modified micro-MEA is developed and employed to evaluate the electrocatalytic performance of Pt/C and PtRu/C. Firstly, micro-MEA displays better electrocatalytic performance including lower onset potential and higher peak current in comparison with traditional glass carbon electrode (GCE), because that micro-MEA effectively avoids interferences from specific adsorption of bisulfate ions on platinum and improve mass transfer of the fuel. Then, evaluation of the effect of Nafion content and methanol concentration on the MOR performance of Pt/C and PtRu/C is carried out. The results reveal that Pt/C shows optimized performance with 30 wt% Nafion in low concentration methanol (0.5-1 M), while PtRu/C displays best performance when Nafion content was adjusted to 10 wt% because of easier formation of complete proton pathway and triple-phase boundary (TPB) compared to Pt/C, indicating that the optimized in-situ work condition is significantly different for different electrocatalysts. Our work in this paper indicates that micro-MEA as a kind of in-situ characterization method can give more precise electrocatalytic performance of electrocatalysts close to work condition and facilitate their sieving and further application in DMFC. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.