Abstract Poly (2, 5-benzimidazole) (ABPBI) membrane was prepared via membrane casting method using four different solvents, viz. methane sulfonic acid (MSA), trifluoroacetic acid (TFA), formic acid (FA) and sulfuric acid (SA). Phosphoric acid (PA) was doped in the corresponding ABPBI membrane to enhance the proton conductivity. It has been observed that the ABPBI membrane prepared by different solvents absorbed different amount of PA with varying level of doping, which led to different extent of hardness and Young’s modulus as shown via nano-indentation analysis. ABPBI membrane prepared using trifluoroacetic acid doped ABPBI membrane (dABPBI-TFA) showed highest proton conductivity of 1.6 × 10 -3 S cm -1 at 150 °C. Fuel cells were fabricated using ABPBI-MSA and ABPBI-TFA based membranes and the performances were evaluated. Current density of 403 and 221 mA/cm 2 was achieved at 0.6 V respectively for the cell based on ABPBI-MSA and ABPBI-TFA membrane when operated at 150 °C.

中文翻译：

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用于高温聚合物电解质燃料电池的掺杂聚（2, 5-苯并咪唑）膜：膜浇注过程中各种溶剂对燃料电池性能的影响

摘要 使用四种不同的溶剂，通过膜浇注法制备了聚（2, 5-苯并咪唑）（ABPBI）膜。甲磺酸 (MSA)、三氟乙酸 (TFA)、甲酸 (FA) 和硫酸 (SA)。磷酸 (PA) 掺杂在相应的 ABPBI 膜中以提高质子传导性。已经观察到，通过不同的溶剂制备的 ABPBI 膜吸收不同量的 PA 和不同的掺杂水平，这导致不同程度的硬度和杨氏模量，如纳米压痕分析所示。使用三氟乙酸掺杂的 ABPBI 膜 (dABPBI-TFA) 制备的 ABPBI 膜在 150°C 下显示出最高的质子电导率为 1.6 × 10 -3 S cm -1。使用基于 ABPBI-MSA 和 ABPBI-TFA 的膜制造燃料电池并评估其性能。