Manipulating nanophase-separation behavior and constructing ion-channels is of great challenge for optimizing proton transport. Herein, a novel strategy is demonstrated for constructing long-range and consecutive proton-conducting channels by immobilizing bio-analogue l-lysine onto surface of hydrolyzed polyacrylonitrile (PAN) nanofibers (L/P NFs), combing the superiority of the hydrophilicity 3D network structure (3DNWS) of hydrolyzed PAN NFs and the function of l-lysine as proton-conductors. The hybrid proton exchange membranes (PEMs) are fabricated by filling the inter-fiber voids of L/P NFs with Nafion matrix. The acid–base ion-channels formed between –SO₃H of Nafion and –NH₂ of L/P NFs may offer the abundant hydrogen-bonded networks for proton hopping. The results show L@Nafion hybrid PEMs can reach 0.263 S/cm (80 °C, 100% relative humidity) proton conductivity and 122.82 mW/cm² power density for fuel-cell performance. Besides, the preponderance of 3DNWS of L/P NFs can considerably facilitate the thermal and dimensional stability as well as restrict methanol crossover for hybrid PEMs. This approach brings a unique vision for preparing high-performance PEMs for direct methanol fuel cells.

操纵纳米相分离行为和构建离子通道是优化质子传输的巨大挑战。本文中，通过结合亲水3D网络的优越性，展示了一种通过将生物类似物l-赖氨酸固定在水解聚丙烯腈（PAN）纳米纤维（L / P NFs）表面上来构建长距离且连续的质子传导通道的新策略。水解PAN NFs的结构（3DNWS）和l-赖氨酸作为质子导体的功能。通过用Nafion基质填充L / P NFs的纤维间空隙来制造混合质子交换膜（PEM）。Nafion的–SO ₃ H和–NH ₂之间形成的酸碱离子通道L / P NF可能为质子跳跃提供丰富的氢键网络。结果表明，L @ Nafion混合PEM可以达到0.263 S / cm（80°C，100％相对湿度）的质子传导率和122.82 mW / cm ^2的功率密度，以提高燃料电池的性能。此外，L / P NFs的3DNWS优势可以大大促进热和尺寸稳定性，并限制混合PEM的甲醇交换。这种方法为制备直接甲醇燃料电池的高性能PEM带来了独特的愿景。