Quaternary Ammonium-Free Membranes for Water Electrolysis with 1 m KOH,Advanced Energy Materials

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Quaternary Ammonium-Free Membranes for Water Electrolysis with 1 m KOH
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-10-22 , DOI: 10.1002/aenm.202302966
Asridin Dayan _{1,

2} , Muhammad Luthfi Akbar Trisno _{1,

2} , Chaeyeon Yang _{1,

3} , Mikkel Rykær Kraglund ₄ , Mads Radmer Almind ₄ , Johan Hjelm ₄ , Jens Oluf Jensen ₄ , David Aili ₄ , Hyun S. Park _{1,

2} , Dirk Henkensmeier _{1,

2,

5}

Affiliation

While anion exchange membrane (AEM) water electrolysis has many advantages, its commercialization is impeded by the low alkaline stability of most AEM, due to the fragility of quaternary ammonium groups. Ion solvating membranes (ISM) can be an alternative, but so far require high alkaline concentrations. Here, it is shown that sulfonation of polybenzimidazole results in ISM which swell strongly in 1 m KOH. Crosslinking with dibromoxylene controls the swelling, and after activation conductivities of >100 mS cm⁻¹ can be reached in 1 m KOH. Stability in 1 m KOH at 80 °C is excellent: Conductivity remains unchanged and tensile strength and Young's modulus remains high over the test period of a half year. In an electrolyzer operating with 1 m KOH feed solution at 80 °C, a stable performance is achieved for over 500 h test without failure, suggesting that the high alkaline stability observed in ex situ tests is also achieved in the electrolyzer.

中文翻译：

用于 1 m KOH 水电解的无季铵膜

虽然阴离子交换膜（AEM）水电解具有许多优点，但由于季铵基团的脆弱性，大多数AEM的碱性稳定性较低，阻碍了其商业化。离子溶剂化膜 (ISM) 可以作为替代方案，但到目前为止需要高碱性浓度。此处，表明聚苯并咪唑的磺化导致 ISM 在 1 m KOH 中强烈溶胀。与二溴二甲苯的交联控制溶胀，并且活化后在1m KOH中可以达到 >100mScm ^-1的电导率。在 80 °C 1 m KOH中的稳定性非常出色：在半年的测试期间，电导率保持不变，拉伸强度和杨氏模量保持较高水平。在 80 °C 下使用 1 m KOH 进料溶液运行的电解槽中，在超过 500 小时的测试中实现了稳定的性能而没有出现故障，这表明在异位测试中观察到的高碱性稳定性也在电解槽中实现。

更新日期：2023-10-22

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