Polymer electrolyte membranes with highly stable phosphoric acid loading continue to pose a challenge for the development of durable high temperature polymer electrolyte membrane fuel cells. A new class of highly conductive and durable composite membranes is prepared for high temperature fuel cell application under anhydrous conditions. 2,6-Pyridine functionalized polybenzimidazole (Py-PBI) is used as substrate for hosting phosphoric acid moiety. A highly dispersible phosphonated graphene oxide (PGO) introduced to Py-PBI substrate at different levels prior to acid doping and conductivity, durability and fuel cell performance of developed membranes are evaluated. A proton conductivity as high as 76.4 × 10⁻³ S cm⁻¹ is achieved at 140 °C under anhydrous condition. A strong correlation is found between the content of PGO and the stability of the acid content despite similarity in doping level. In general, the conductivity is obviously more stable in the PGO containing membranes. A Pt-catalyzed fuel cell using the developed composite membranes show a peak power density >359 mW cm⁻² at 120 °C under anhydrous condition which is above 75% improvements compared to the membranes without the phosphonated filler. This work demonstrates that the adopted membrane preparation strategy and their observed properties pave the way for highly conductive and durable proton conducting membranes.

具有高度稳定的磷酸负载的聚合物电解质膜继续对耐用的高温聚合物电解质膜燃料电池的开发提出挑战。制备了一种新型的高导电性和耐用性复合膜，用于无水条件下的高温燃料电池应用。2,6-吡啶官能化的聚苯并咪唑（Py-PBI）被用作承载磷酸部分的底物。在酸掺杂之前，以不同的水平将高分散性膦酸氧化石墨烯（PGO）引入Py-PBI基材中，并评估了已开发膜的电导率，耐久性和燃料电池性能。质子传导率高达76.4×10 ^-3  S cm ^-1在无水条件下于140°C达到。尽管掺杂水平相似，但在PGO的含量和酸含量的稳定性之间发现了很强的相关性。通常，在含PGO的膜中，电导率显然更稳定。使用已开发的复合膜的Pt催化燃料电池 在无水条件下于120°C时显示的峰值功率密度> 359 mW cm ^-2，与不使用磷化填料的膜相比，提高了75％以上。这项工作表明，采用的膜制备策略及其观察到的性能为高导电性和耐用性的质子导电膜铺平了道路。