Abstract A novel photocatalytic phosphonylation approach was firstly developed to prepare phosphonated poly (phenylene sulfone) (P-PPSU) by post-phosphonylation of brominated poly (phenylene sulfone) (Br-PPSU) and subsequent acidification. The proton conductive P-PPSU polymers are found to be excellent binder materials in catalyst layer to reduce the decay of operating performance of high-temperature proton exchange membrane fuel cell (HT-PEMFC). After irradiation with a LED area source (λ = 365 nm), the P-PPSU polymers with ion-exchange capacity (IEC) values ranging from 1.41 to 2.75 meq/g are obtained successfully with the degree of post-phosphonylation in the range of 18–32%, and without significant degradation of polymer backbone. All the membranes show excellent mechanical properties as well as superior thermal and antioxidant stability. Although the proton conductivity of the P-PPSU-2.75 membrane at high temperature without extra humidification is only 0.30 mS/cm at 160 °C, the peak power density of 242 mW/cm2 is achieved when it is employed as binder in H2/O2 fuel cell operation at 160 °C. This value is lower than that of the fuel cell using PTFE as binder (379 mW/cm2), probably because the PTFE binder in the catalyst layer increases the solubility and diffusivity of oxygen in phosphoric acid (PA) and improves the oxygen reduction kinetics in cathode. However, excellent durability of 200 h is observed in fuel cells operated at 160 °C with P-PPSU-2.75 polymer binder with no significant decrease in performance, while the performance of the fuel cell with PTFE binder decreases rapidly to half of its original value in 150 h. These results suggest that the phosphonated and proton conductive P-PPSU polymer is a promising binder material in catalyst layer for highly durable HT-PEMFCs.

中文翻译：

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用于耐用高温质子交换膜燃料电池的膦化聚砜的合成及性能

摘要 首次开发了一种新的光催化膦酰化方法，通过溴化聚苯砜（Br-PPSU）的后膦酰化和随后的酸化制备膦化聚苯砜（P-PPSU）。发现质子传导性 P-PPSU 聚合物是催化剂层中优异的粘合剂材料，可减少高温质子交换膜燃料电池 (HT-PEMFC) 运行性能的衰减。用 LED 面光源 (λ = 365 nm) 照射后，成功获得离子交换容量 (IEC) 值范围为 1.41 至 2.75 meq/g 的 P-PPSU 聚合物，后膦酰化程度为18-32%，并且聚合物骨架没有明显降解。所有膜都显示出优异的机械性能以及优异的热稳定性和抗氧化稳定性。尽管 P-PPSU-2.75 膜在没有额外加湿的情况下在高温下的质子电导率在 160°C 下仅为 0.30 mS/cm，但在 H2/O2 中用作粘合剂时实现了 242 mW/cm2 的峰值功率密度燃料电池在 160 °C 下运行。该值低于使用 PTFE 作为粘合剂的燃料电池 (379 mW/cm2)，可能是因为催化剂层中的 PTFE 粘合剂增加了氧在磷酸 (PA) 中的溶解度和扩散率，并改善了磷酸 (PA) 中的氧还原动力学。阴极。然而，在使用 P-PPSU-2.75 聚合物粘合剂的燃料电池中，在 160 °C 下运行时观察到 200 小时的优异耐久性，而性能没有显着下降，而使用 PTFE 粘合剂的燃料电池的性能迅速下降至其原始值的一半在 150 小时内。