Gas diffusion electrodes containing sulfonated polyether ionomers for PEFCs
Gas diffusion electrodes containing sulfonated polyether ionomers for PEFCs
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DOI：
10.1016/j.electacta.2007.08.054
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发表时间：
2007-12
影响因子：
6.6
通讯作者：
A. B. Béléké;K. Miyatake;H. Uchida;Masahiro Watanabe
中科院分区：
文献类型：
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作者：
A. B. Béléké;K. Miyatake;H. Uchida;Masahiro Watanabe
制备了以磺化聚醚离聚体为质子导电粘合剂的气体扩散电极，并在H2/O2聚合物电解质燃料电池中进行了评价。首次将高压釜处理应用于烃离聚物以制备GDE。在电流密度高达800 mA/cm ~ 2时，GDE作为阳极工作良好，无实际过电位。作为阴极，GDE表现出显着的SPE含量和其离子交换容量（IEC）的依赖性。由于增强的质子传导，具有较高SPE含量的GDE实现了较高的催化剂利用率。循环伏安法暗示基于SPE的GDE的催化剂利用率高于基于常规Nafion®的GDE。扫描透射电镜（STEM）显示SPE离聚物均匀地包覆在Pt/炭黑催化剂表面。加湿条件影响SPE离聚物的质子传导性和溶胀，因此对阴极性能至关重要。具有中等IEC（2.17meq/g）的SPE离聚物在催化剂利用率方面在GDE中表现最好。
Gas diffusion electrodes (GDEs) containing sulfonated polyether (SPE) ionomers as proton conducting binder have been prepared and evaluated in H2/O2polymer electrolyte fuel cells. An autoclave treatment has been applied for the first time to a hydrocarbon ionomer for the preparation of GDEs. The GDEs worked well as anode without practical overpotential up to 800mA/cm2of the current density. As cathode, the GDEs showed significant dependence on the SPE content and its ion exchange capacity (IEC). Higher catalyst utilization was achieved for the GDEs with higher SPE content due to enhanced proton conduction. Cyclic voltammetry implied higher catalyst utilization of the SPE-based GDEs than that of the conventional Nafion®-based GDEs. Scanning transmission electron microscopy (STEM) revealed that the SPE ionomer coated uniformly on the surface of Pt/carbon black catalysts. Humidification conditions affect proton conductivity and swelling of the SPE ionomer and thus were crucial for the cathode performance. SPE ionomer with medium IEC (2.17meq/g) served best in GDEs in terms of catalyst utilization.