OH⁻ transport through anion exchange membranes (AEMs) is influenced by the arrangement of ion channels. Inspired by the channel structure of pectin in plants, a precise molecular regulation approach has here been developed for designing high-performance AEMs. This approach utilizes two steric molecules, triptycene and 9,9′-spirobifluorene, as dual spatially cross-linking centers in AEMs. By incorporating both of these steric centers into poly(terphenyl piperidinium), the pore structure stability, ionic conductivity, and mechanical strength are further improved. This variant achieved a high OH⁻ conductivity of 197.4 mS cm⁻¹ and a significantly low swelling ratio of 8.6% at 80 °C. These characteristics enable the use of AEM water electrolysis (AEM-WE) for the achievement of a current density of 8.4 A cm⁻² at 2.0 V when using completely platinum group metal (PGM)-free catalysts. This device also demonstrated high performance by achieving a current density of 2.0 A cm⁻² at a cell voltage of 1.77 V at 60 °C, along with excellent stability (aging rate of 0.077 mV h⁻¹). It should be noted that an electrode cell based on a five-stacked-membrane, with a total flow-field area of 1250 cm², has been used in the present study. In addition, this cell device allowed for a current density of 20 000 A m⁻² at a cell voltage of 2.0 V. The molecular regulation approach developed here precisely represents a promising strategy for industrial applications of PGM-free AEM-WE systems.

中文翻译：

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具有双空间交联中心的仿生阴离子交换膜，用于工业规模水电解


OH ^-通过阴离子交换膜 (AEM) 的传输受到离子通道排列的影响。受植物果胶通道结构的启发，我们开发了一种精确的分子调控方法来设计高性能 AEM。该方法利用两种空间分子，三蝶烯和 9,9'-螺二芴，作为 AEM 中的双空间交联中心。通过将这两个空间中心并入聚（三联苯哌啶）中，孔结构稳定性、离子电导率和机械强度得到进一步改善。该变体在 80 °C 下实现了 197.4 mS cm ^-1的高 OH ^-电导率和 8.6% 的显着低溶胀率。这些特性使得当使用完全不含铂族金属（PGM）的催化剂时，AEM水电解（AEM-WE）能够在2.0V下实现8.4A cm ^-2的电流密度。该器件还表现出高性能，在 60 °C、1.77 V 电池电压下实现了 2.0 A cm ^-2的电流密度，以及出色的稳定性（0.077 mV h ^-1的老化速率）。值得注意的是，本研究中使用了基于五叠层膜的电极电池，总流场面积为1250 cm ² 。此外，该电池装置在2.0 V的电池电压下允许20 000 A m ^-2的电流密度。这里开发的分子调控方法准确地代表了无PGM AEM-WE系统的工业应用的有前景的策略。