Given the environmental concerns surrounding fluoromaterials, the use of high‐cost perfluorinated sulfonic acids (PFSAs) in fuel cells and water electrolysis contradicts the pursuit of clean energy systems. Herein, we present a fluorine‐free dumbbell‐shaped block‐graft copolymer, derived from the cost‐effective triblock copolymer poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene) (SEBS), for polymer electrolyte membranes (PEMs). This unique polymer shape led to the alignment of the hydrophobic‐hydrophilic domains along a preferred orientation, resulting in the construction of interconnected proton channels across the membrane. A bicontinuous network allowed efficient proton transport with reduced tortuosity, leading to an exceptional ionic conductivity (249 mS cm‐1 at 80 °C and 90% relative humidity (RH)), despite a low ion exchange capacity (IEC; 1.41). Furthermore, membrane‐electrode assembly (MEA) prepared with our membrane exhibited stable performance over a period of 150 h at 80 °C and 30% RH. This study demonstrates a novel polymer structure design and highlights a promising outlook for hydrocarbon PEMs as alternatives to PFSAs.

中文翻译：

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用于高性能碳氢聚合物电解质膜的具有对齐域的哑铃形嵌段接枝共聚物

考虑到围绕氟材料的环境问题，在燃料电池和水电解中使用高成本的全氟磺酸（PFSA）与清洁能源系统的追求相矛盾。在此，我们提出了一种无氟哑铃形嵌段接枝共聚物，源自具有成本效益的三嵌段共聚物聚（苯乙烯-b-乙烯-共聚-丁烯-b-苯乙烯）（SEBS），用于聚合物电解质膜（PEM） ）。这种独特的聚合物形状导致疏水-亲水域沿优选方向排列，从而构建跨膜互连的质子通道。尽管离子交换容量较低（IEC；1.41），双连续网络允许有效的质子传输并减少曲折度，从而产生优异的离子电导率（80°C和90%相对湿度（RH）下为249 mS cm-1）。此外，用我们的膜制备的膜电极组件（MEA）在 80 °C 和 30% RH 的条件下在 150 小时内表现出稳定的性能。这项研究展示了一种新颖的聚合物结构设计，并强调了碳氢质子交换膜作为 PFSA 替代品的广阔前景。