Catalyst loading for Pt-nanowire thin film electrodes in PEFCs
Catalyst loading for Pt-nanowire thin film electrodes in PEFCs
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DOI：
10.1016/j.ijhydene.2012.08.148
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发表时间：
2012-12-01
影响因子：
7.2
通讯作者：
Pollee, Bruno G.
中科院分区：
文献类型：
--
作者：
Du, Shangfeng;Pollee, Bruno G.
在低温聚合物电解质燃料电池（PEFC）中，Pt纳米线（Pt-NWs）作为一种一维纳米材料，被认为是一种很有前途的催化剂。也有报道称，纳米结构的优异催化性能得益于其独特的一维特征，但也带来了不寻常的形状和庞大的比体积，这使得Pt-NW难以通过任何常规程序制造成燃料电池电极。为了了解催化剂负载量对Pt-NW电极结构的影响，考察了不同催化剂负载量的Pt-NW薄膜电极对低温PEFC阴极侧氧还原反应（ORR）能力的影响。SEM，XRD和电化学阻抗谱（EIS）测量进行，以帮助理解和阐明电极的作用下的“真实的”条件。结果表明，与具有球形电催化剂的常规GDE相比，类似的最佳催化剂负载，但随着Pt-NW负载的增加，显示出不同的电极结构，尽管在高Pt-NW负载下观察到类似的更大的传质阻力。本文对这一机理作了进一步的探讨。版权所有（c）2012，氢能出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Among electrocatalysts with novel nanostructures in low temperature polymer electrolyte fuel cells (PEFCs), Pt nanowires (Pt-NWs), as one-dimensional (1-D) nanomaterials, are recognized as promising candidates. It has also been reported that the excellent catalytic performance of the nanostructure benefited from their unique 1-D features, but also bring unusual shapes and bulky specific volumes, which make Pt-NWs difficult to fabricate into fuel cell electrodes by any conventional procedures. To understand the effect of catalyst loading on the Pt-NW electrode structure, Pt-NW thin film electrodes of various catalyst loadings were examined towards the oxygen reduction reaction (ORR) ability at the cathode side in low temperature PEFCs. SEM, XRD and electrochemical impedance spectroscopy (EIS) measurements were performed to help understanding and elucidating the electrode role under 'real' conditions. The results showed a similar optimal catalyst loading as compared with conventional GDEs with spherical electrocatalysts, but exhibiting a different electrode structure with increasing Pt-NW loading, although a similar larger mass transfer resistance was observed at high Pt-NW loading. The mechanism is further discussed in this paper. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.