▎ 摘　　要

The amphiphilic polybenzoxazines-co-epoxy membrane (POPBOs/PTGP) was created by thermally cross-linking the multi-functional octylamine-based benzoxazine monomer (OPBOs) with synthesized 1,3,5-tris(oxiran-2-yl methoxy)benzene epoxy monomer (TGP). Fourier transform infrared spectroscopy, powder x-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy were used to investigate the functionality, crystallinity, and morphology of microcrystal lead(II) sulfide (PbS)/graphene nanosheets (mPbS/GNs). The bare POPBOs/PTGP and different amounts of mPbS/GNs dispersed polymer nanocomposites (PNCs) were obtained from the thermal curing process. Following that, these PNCs were used in medium-temperature proton exchange membrane fuel cells. The water uptake, ion exchange capacity (IEC), swelling ratio, oxidative stability, and proton conductivity (PC) of bare and loaded mPbS/GNs hybrid nanostructures on POPBOs/PTGP composite membranes were determined. 3 wt% mPbS/GNs distributed with POPBOs/PTGP PNCs exhibit the highest IEC value of 3.61 mmol/g(-1) at room temperature, and a PC value of around 6.33 x 10(-2) S/cm(-1) at 120 degrees C was obtained for the POPBOs/PTGP PNCs. In addition, the single-cell electrode analysis of the 3 wt% mPbS/GNs-filled POPBOs/PTGP amphiphilic PNCs showed excellent peak power density and open circuit voltage values of 0.897 W cm(-2) and 0.97 V at 120 degrees C.