Background

High cost is a main barrier of commercialization for high temperature polymer electrolyte membrane fuel cell (HT-PEMFC). Thus, enhancing the efficiency of platinum (Pt) utilization and improving the performance of HT-PEMFC is expected to promote its commercialization.

Methods

A novel cathode with dual catalyst layer (DCL) structure is designed for enhancing the performance of HT-PEMFC. The catalyst is mainly distributed in outer CL (next to membrane) to concentrate Pt, while a small amount of catalyst is used in inner CL (close to gas diffusion layer). High-Pt-content catalysts (40, 50 wt% Pt/C) and low-Pt-content catalysts (10, 20 wt% Pt/C) are utilized in outer and inner CLs, respectively, to maintain the same thicknesses of two CLs.

Significant findings

2/4-DCL gas diffusion electrode (GDE) with an outer CL consists of 40 wt% Pt/C and an inner CL consists of 20 wt% Pt/C shows the highest performance among prepared DCL structured GDEs, which also shows a significantly higher performance than the conventional single CL structured GDEs due to the novel structure of DCL. Finally, a good durability of 2/4-DCL GDE indicates the feasibility in practical HT-PEMFC.

中文翻译：

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使用新型双催化剂层结构阴极提高高温聚合物电解质膜燃料电池的性能

背景

高成本是高温聚合物电解质膜燃料电池（HT-PEMFC）商业化的主要障碍。因此，提高铂（Pt）利用效率和改善 HT-PEMFC 的性能有望促进其商业化。

方法

具有双催化剂层 (DCL) 结构的新型阴极旨在提高 HT-PEMFC 的性能。催化剂主要分布在外部CL（靠近膜）以浓缩Pt，而少量催化剂用于内部CL（靠近气体扩散层）。高 Pt 含量催化剂（40、50 wt% Pt/C）和低 Pt 含量催化剂（10、20 wt% Pt/C）分别用于外层和内层 CL，以保持两个相同的厚度CL。

重要发现

2/4-DCL 气体扩散电极 (GDE) 的外部 CL 由 40 wt% Pt/C 组成，内部 CL 由 20 wt% Pt/C 组成，在制备的 DCL 结构的 GDE 中表现出最高的性能，这也显示出显着的由于 DCL 的新颖结构，它比传统的单 CL 结构 GDE 具有更高的性能。最后，2/4-DCL GDE 的良好耐久性表明在实际 HT-PEMFC 中的可行性。