Tailoring Ionomer Chemistry for Improved Oxygen Transport in the Cathode Catalyst Layer of Proton Exchange Membrane Fuel Cells,ACS Applied Energy Materials

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Tailoring Ionomer Chemistry for Improved Oxygen Transport in the Cathode Catalyst Layer of Proton Exchange Membrane Fuel Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-03-03 , DOI: 10.1021/acsaem.3c00193
Siqi Fang _{1,

2} , Guoliang Liu ₁ , Minghai Li ₁ , Haining Zhang ₁ , Jun Yu ₁ , Fangfang Zhang ₃ , Mu Pan _{1,

2} , Haolin Tang _{1,

2}

Affiliation

Reducing the local oxygen transport resistance in the cathode catalyst layer of the proton exchange membrane fuel cell (PEMFC) is crucial for the improvement of cell performance, particularly for low platinum loading. In this work, we report that the performance of PEMFC can be significantly improved by replacing Nafion with a highly oxygen-permeable perfluoronated ionomer containing dioxole segments on the backbone as both proton conductor and catalyst binder in the cathode catalyst layer, as evidenced by the increased peak power density of 100 mW cm^–2. Molecular dynamics simulation results reveal that the synthesized ionomer has higher diffusion coefficient and higher oxygen solubility compared with Nafion. Benefiting from the high oxygen permeability, both the specific activity and mass specific activity of a Pt/C catalyst using the designed ionomer as catalyst binder for the oxygen reduction reaction are three times higher than those of a catalyst using Nafion as catalyst binder. The results demonstrate that the rational design of highly oxygen-permeable ionomers applied in the catalyst layer could be an effective strategy for a high-performance PEMFC with low platinum loading.

中文翻译：

定制离聚物化学以改善质子交换膜燃料电池阴极催化剂层中的氧传输

降低质子交换膜燃料电池 (PEMFC) 阴极催化剂层中的局部氧气传输阻力对于提高电池性能至关重要，特别是对于低铂载量。在这项工作中，我们报告说，通过用高透氧性全氟化离聚物代替 Nafion 可以显着提高 PEMFC 的性能，该离聚物在主链上含有二氧杂环戊烷链段作为阴极催化剂层中的质子导体和催化剂粘合剂，增加的证据表明峰值功率密度为 100 mW cm ^–2. 分子动力学模拟结果表明，与Nafion相比，合成的离聚物具有更高的扩散系数和更高的氧溶解度。得益于高透氧性，使用设计的离聚物作为氧还原反应的催化剂粘合剂的Pt/C催化剂的比活性和质量比活性均是使用Nafion作为催化剂粘合剂的催化剂的三倍。结果表明，合理设计应用于催化剂层的高透氧性离聚物可能是实现低铂负载的高性能 PEMFC 的有效策略。

更新日期：2023-03-03

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