Highly durable alkaline water electrolyzer with branched poly(oxindole biphenylene) ion-solvating membrane

IF 11.5 Q1 CHEMISTRY, PHYSICAL

Chem Catalysis Pub Date : 2024-12-16 DOI:10.1016/j.checat.2024.101199

Min Liu, Ruofei Gao, Kang Geng, Yingda Huang, Xiaowei Zhou, Jin Yao, Bin Hu, Hongjing Li, Boxin Xue, Nanwen Li

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Abstract

Ion-solvating membranes (ISMs) offer a novel approach for high-rate alkaline water electrolyzers (AWEs), but device durability remains a major challenge for their practical application. Herein, we first found that the oxidation stability of ISMs in electrolyzers showed a significant effect on their long-term device durability, in addition to the alkaline stability. More importantly, both the operating temperature and the voltage have been observed as crucial factors affecting the oxidative stability of ISMs. While maintaining other excellent properties, the branching polymer chain in ISMs could further enhance their oxidative stability. As a result, a highly durable AWE with branched poly(oxindole biphenylene) (POBP) ISMs operated stably for over 15,000 h at 2.26 V and 60°C, representing the longest reported lifetime for ISM-based AWEs to date. These results provide significant guidance on how to reasonably design the polymer backbone and adjust the operating conditions to prolong the membrane’s lifetime in AWEs for practical applications.

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具有支链聚氧吲哚联苯离子溶剂化膜的高耐用碱性水电解槽

离子溶剂化膜（ISMs）为高速率碱性水电解槽（awe）提供了一种新方法，但设备耐久性仍然是其实际应用的主要挑战。在此，我们首次发现除了碱性稳定性外，电解槽中ISMs的氧化稳定性对其长期设备耐用性也有显著影响。更重要的是，工作温度和电压都是影响ISMs氧化稳定性的关键因素。在保持ISMs其他优良性能的同时，分支聚合物链可以进一步提高其氧化稳定性。因此，具有支链聚氧吲哚联苯（POBP） ISMs的高耐用AWE在2.26 V和60°C下稳定运行超过15,000小时，是迄今为止报道的基于ISMs的AWE的最长寿命。这些结果对如何合理设计聚合物骨架和调整操作条件以延长膜的使用寿命具有重要的指导意义。

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来源期刊

Chem Catalysis

CiteScore

10.50

自引率

6.40%

发文量

期刊介绍： Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.