In this study, two kinds of membrane electrode assembly (MEAs) based on the CsH₅(PO₄)₂-doped polybenzimidazole (PBI) membrane and fabricated by the catalyst-coated membrane (CCM) method are reported. In the first one, named Type-GDL/PA MEA, phosphoric acid (PA) is sprayed onto the surface of the gas diffusion layer (GDL), and in the second one, named Type-CL/PA MEA, PA is sprayed onto the surface of the catalyst layer (CL). The results show that the Type-CL/PA MEA exhibits significantly higher performance than the Type-GDL/PA MEA, providing the highest peak power densities of 620 and 413 mW cm⁻² at 180°C under humidified H₂/O₂ and H₂/air fuel cell conditions, respectively. Moreover, their performance is promoted in the presence of humidified gas feed streams as compared to dry gas conditions at the same temperature. The electrochemical impedance spectroscopy (EIS) analysis indicates a lower charge transfer resistance for the Type-CL/PA MEA as compared to the Type-GDL/PA MEA. The former MEA also presents higher stability, as confirmed by a 100 h durability test, resulting in a voltage degradation rate of 0.17 mV h⁻¹, which is much lower than the corresponding voltage drop of 0.71 mV h⁻¹ for the Type-GDL/PA MEA.

中文翻译：

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基于用于 HT-PEMFC 的 CsH5(PO4)2 掺杂聚苯并咪唑膜的 CCM 型 MEA 的性能

在这项研究中，报道了两种基于 CsH ₅ (PO ₄ ) ₂掺杂聚苯并咪唑 (PBI) 膜并通过催化剂涂层膜 (CCM) 方法制造的膜电极组件 (MEA)。第一个名为 Type-GDL/PA MEA，将磷酸 (PA) 喷涂到气体扩散层 (GDL) 的表面，第二个名为 Type-CL/PA MEA，将 PA 喷涂到催化剂层（CL）的表面。结果表明，Type-CL/PA MEA 的性能明显高于 Type-GDL/PA MEA，在 180°C 加湿 H ₂ ^/ O ₂和氢₂/空气燃料电池条件，分别。此外，与相同温度下的干燥气体条件相比，它们的性能在存在加湿气体进料流的情况下得到提升。电化学阻抗谱 (EIS) 分析表明，与 Type-GDL/PA MEA 相比，Type-CL/PA MEA 的电荷转移电阻更低。前者的 MEA 还表现出更高的稳定性，正如 100 小时耐久性测试所证实的那样，电压衰减率为 0.17 mV h ^-1，远低于Type-GDL的相应电压降 0.71 mV h ^-1 /PA 多边环境协定。