Anisotropic Polybenzimidazole Ion-Solvating Membranes Composed of Aligned Nano-Sheets for Efficient Acid-Alkaline Amphoteric Water Electrolysis,Advanced Energy Materials

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Anisotropic Polybenzimidazole Ion-Solvating Membranes Composed of Aligned Nano-Sheets for Efficient Acid-Alkaline Amphoteric Water Electrolysis
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-12-29 , DOI: 10.1002/aenm.202303481
Zequan Huang ₁ , Danyi Zhu ₁ , Brian C. Benicewicz ₂ , Tianyu Zhu ₃ , Jiazhen Liang ₁ , Taizhong Zhu ₁ , Liang Zhang ₁ , Mengjiao Liu ₁ , Congjie Gao ₁ , Fei Huang ₁ , Lixin Xue _{4,

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Affiliation

Acid-alkaline amphoteric water electrolysis (AAA-WE) can produce green hydrogen under reduced voltage and energy consumption. However, its conflicting demands on ion exchange membranes to have both high ionic conductivity and barrier properties between H⁺ and OH⁻ have thwarted its own development. Here, the preparation of anisotropic polybenzimidazole (PBI) ion-solvating membrane (ISM) made of hundreds of 28 nm thick nano-sheets (PBI-aNS) from gel state PBI (PBI-Gel) membranes via 2D-polarized/1D shrinking process, in which loosely packed multi-layer PBI nano-fibrous assemblies are shrunken into hundreds of layers of tight 28 nm thick nano-sheets, is reported. The resulting PBI-aNS membranes possess excellent dual-ion conductivity (H⁺ and OH⁻), good acid/alkali barrier capability, and robust mechanical properties. Acid-alkaline amphoteric water electrolysis (AAA-WE) using PBI-aNS separators achieves a high current density of 1 A cm⁻² at 1.4 V (with iR-correction) under a voltage increasing rate of 6.1 mV h⁻¹. This newly designed ISM will lead to new possibilities for the development of next-generation water electrolysis devices with improved green hydrogen production efficiencies.

中文翻译：

由排列纳米片组成的各向异性聚苯并咪唑离子溶剂化膜用于高效酸碱性两性水电解

酸碱两性水电解（AAA-WE）可以在降低电压和能耗的情况下生产绿色氢气。然而，其对离子交换膜既具有高离子电导率又具有H ⁺和OH ^-之间的阻隔性能的相互矛盾的要求阻碍了其自身的发展。在这里，通过 2D 偏振/1D 收缩工艺从凝胶态 PBI (PBI-Gel) 膜制备由数百个 28 nm 厚的纳米片 (PBI-aNS) 制成的各向异性聚苯并咪唑 (PBI) 离子溶剂化膜 (ISM)据报道，其中松散堆积的多层 PBI 纳米纤维组件被收缩成数百层紧密的 28 nm 厚的纳米片。所得的 PBI-aNS 膜具有优异的双离子电导率（H ⁺和 OH ^-）、良好的酸/碱阻隔能力和强大的机械性能。使用PBI-aNS分离器的酸碱两性水电解（AAA-WE）在6.1 mV h ^-1的电压增加速率下在1.4 V（带iR校正）下实现了1 A cm ^-2的高电流密度。这种新设计的ISM将为开发下一代水电解装置带来新的可能性，并提高绿色氢气生产效率。

更新日期：2023-12-29

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