High utilization of catalyst and preserving evenly distributed pores for Proton Exchange Membrane Fuel Cell (PEMFC) electrodes were optimized using an in-house designed electrospray system. In order to hold the porous electrode structure prepared through the electrospray technique by varying ink compositions. Using optimized electrodes and commercially available Nafion-212 membrane, a series of membrane-electrode assemblies (MEAs) were fabricated by varying the hot-pressing parameters of pressure, temperature, and time for evaluating the performance at 60 °C to 80 °C with varying relative humidity. The MEAs were hot-pressed at 8 MPa for 390 s at a temperature of 150 °C generating a maximum peak power density of 903 mW cm and current density of 1040 mA cm at 0.6 V and calculated electrochemical surface area (ECSA) is 23.96 m/g. In contrast, the MEAs hot-pressed for the same length of time at the same temperature but with a lower pressure of 2.67 MPa generated higher peak power density of 1130 mW cm, higher current density of 1320 mA cm at 0.6 V, despite having a lower ECSA of 19.18 m/g. Overall, results in this study present that low hot-pressing pressure and a high pressing temperature enable a negative effect on the porous structure of electrospray electrodes for producing the high achievement of MEA performance.

中文翻译：

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研究通过电喷雾沉积技术制备均匀微孔催化剂层的催化剂油墨组合物和 PEMFC 特定的 MEA 组装条件

使用内部设计的电喷雾系统优化了催化剂的高利用率并保持质子交换膜燃料电池 (PEMFC) 电极均匀分布的孔隙。为了通过改变墨水成分来保持通过电喷雾技术制备的多孔电极结构。使用优化的电极和市售的 Nafion-212 膜，通过改变压力、温度和时间的热压参数制造了一系列膜电极组件 (MEA)，以评估 60 °C 至 80 °C 的性能不同的相对湿度。MEA在150°C的温度下在8 MPa下热压390秒，在0.6 V下产生903 mW cm的最大峰值功率密度和1040 mA cm的电流密度，计算的电化学表面积（ECSA）为23.96 m /G。相比之下，在相同温度下热压相同时间但压力较低（2.67 MPa）的 MEA 产生了更高的峰值功率密度（1130 mW cm），在 0.6 V 下产生了更高的电流密度（1320 mA cm），尽管具有ECSA 较低为 19.18 m/g。总体而言，本研究结果表明，低热压压力和高压制温度会对电喷雾电极的多孔结构产生负面影响，从而无法实现 MEA 的高性能。