A series of novel nanofiber composite proton exchange membranes were fabricated by embedding highly sulfonated poly (ether ketone) (SPEEK) nanofibers in a cross-linked SPEEK matrix, showing both high proton conductivity and excellent stability. Composite membranes were prepared with salt-form SPEEK nanofiber mats filled with acid-form SPEEK solution. After thermal treatment at 180 °C in the presence of dimethyl sulfoxide, the cross-linking reaction occurred in the acid-form SPEEK matrix but not in nanofibers. The dimensional stability, mechanical strength, and oxidative stability of the composite membrane were significantly improved due to thermal cross-linking treatment. The swelling ratio of all the cross-linked membranes was below 30% in hot water, and the maximum tensile strength reached 68 MPa. The nanofibers formed non-cross-linked regions and retained rich sulfonic acid groups to construct fast, long-range proton transport channels. The proton conductivity of the nanofiber composite cross-linked membrane reached 200 mS/cm exceeding the pristine cross-linked membrane (135 mS/cm). The fuel cell performance showed a peak power density of 485 mW/cm² at 80 °C under 100% relative humidity.

通过将高度磺化的聚醚酮（SPEEK）纳米纤维嵌入交联的SPEEK基质中，制备了一系列新型纳米纤维复合质子交换膜，表现出高质子传导率和优异的稳定性。采用盐型SPEEK纳米纤维垫填充酸型SPEEK溶液制备复合膜。在二甲亚砜存在下于 180 °C 进行热处理后，酸型 SPEEK 基质中发生交联反应，但纳米纤维中未发生交联反应。经过热交联处理，复合膜的尺寸稳定性、机械强度和氧化稳定性显着提高。所有交联膜在热水中的溶胀率均低于30%，最大拉伸强度达到68 MPa。纳米纤维形成非交联区域并保留丰富的磺酸基团以构建快速、长距离的质子传输通道。纳米纤维复合交联膜的质子电导率达到200 mS/cm，超过原始交联膜（135 mS/cm）。燃料电池性能显示峰值功率密度为 485 mW/cm²在 80 °C、100% 相对湿度下。