An aromatic graft polymer was synthesized for a proton exchange membrane (PEM) by grafting a highly sulfonated poly(phenylene sulfide sulfone) side chain onto a poly(arylene ether sulfone) main chain, thus creating a phase-separated morphology with cocontinuous channels of small hydrophilic ion domains. The graft PEM with the distinct hydrophilic/hydrophobic-separated morphology showed low hydrogen permeability while maintaining high proton conductivity. Along with durable dimensional, mechanical, and thermohydrolytic stabilities, the graft PEM showed effective properties for PEM water electrolysis (PEMWE). The graft PEM afforded a PEMWE performance of 6000 mA cm^–2 at 1.9 V, which was 2.1-fold higher than that of N212, and showed a durable performance without loss for 50 h at a high current density (1000 mA cm^–2).

中文翻译：

---

用于水电解的具有极高质子传导性和低氢渗透性的高度磺化芳族接枝聚合物

通过将高度磺化的聚苯硫醚砜侧链接枝到聚亚芳基醚砜主链上，合成了一种用于质子交换膜 (PEM) 的芳族接枝聚合物，从而形成具有小分子共连续通道的相分离形态亲水离子域。具有明显亲水/疏水分离形态的接枝 PEM 在保持高质子传导性的同时显示出低氢渗透性。除了持久的尺寸、机械和热水解稳定性外，接枝 PEM 还显示出适用于 PEM 水电解 (PEMWE) 的有效特性。^{接枝 PEM 在 1.9 V 时提供 6000 mA cm –2}的 PEMWE 性能，比 N212 高 2.1 倍，并且在高电流密度（1000 mA cm^–2）。