Evolution of gas diffusion layer structures for aligned Pt nanowire electrodes in PEMFC applications
Evolution of gas diffusion layer structures for aligned Pt nanowire electrodes in PEMFC applications
复制标题
DOI：
10.1016/j.electacta.2018.05.008
复制
发表时间：
2018-07-20
影响因子：
6.6
通讯作者：
Du, Shangfeng
中科院分区：
文献类型：
--
作者：
Lu, Yaxiang;Steinberger-Wilckens, Robert;Du, Shangfeng
气体扩散层（GDL）是质子交换膜燃料电池（PEMFC）的主要组成部分之一，由微孔层（MPL）和碳纤维基体组成。在具有原位生长的取向Pt纳米线（NW）催化剂的气体扩散电极（GDE）中，GDL还可以在控制Pt纳米线的生长和分布方面提供重要功能。在这项工作中，进行了系统的调查，以评估的GDL结构的PtNW生长过程中，准备GDE的演变。研究了MPL中碳含量、碳组分、聚四氟乙烯（PTFE）含量以及碳纤维基体中PTFE含量对电极功率性能的影响机理。MPL的最佳结构为：炭黑（CB）和乙炔黑（AB）含量相等，炭含量为4 mg·cm ~（-2），PTFE含量为5%。这种GDL结构可以为PtNW的原位生长提供合适的衬底覆盖率、合理的表面成核位点和所需的疏水性。结果表明，GDL功能发挥重要作用，在获得的Pt纳米线的生长和分布，以实现高性能的GDE PEMFC应用。(c)2018爱思唯尔有限公司版权所有
Gas diffusion layer (GDL), consisting of a microporous layer (MPL) and a carbon fibre substrate, is one of the major components in proton exchange membrane fuel cells (PEMFCs). In gas diffusion electrodes (GDEs) with in-situ grown aligned Pt nanowire (NW) catalysts, the GDL can also provide an important function in controlling the growth and distribution of the Pt nanowires. In this work, a systematic investigation is conducted to evaluate the evolution of the GDL structure on the PtNW growth process to prepare GDEs. The influence mechanisms including carbon loading, carbon composition and polytetrafluoroethylene (PTFE) loading in the MPL and PTFE in the carbon fibre substrate on the electrode power performance are studied in detail. An optimum structure for MPL, 4 mg cm(-2) carbon loading with an equal amount of carbon black (CB) and acetylene black (AB), plus 5% PTFE loading, is deserved. This GDL structure can provide suitable substrate coverage, reasonable surface nucleation sites and required hydrophobicity for the in-situ growth of PtNWs. The results indicate that the GDL features play a significant role in the growth and distribution of the obtained Pt nanowires to achieve high performance GDEs for PEMFC application. (c) 2018 Elsevier Ltd. All rights reserved.