An operationally broadened alkaline water electrolyser enabled by highly stable poly(oxindole biphenylene) ion-solvating membranes

Xu Hu, Bin Hu, Chengyuan Niu, Jin Yao, Min Liu, Huabing Tao, Yingda Huang, Shuanyan Kang, Kang Geng () and Nanwen Li ()
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Xu Hu: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
Bin Hu: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
Chengyuan Niu: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
Jin Yao: Ningbo Sino-Tech Hydrogen Membrane Technology Co., Ltd
Min Liu: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
Huabing Tao: State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and College of Chemistry and Chemical Engineering, Xiamen University
Yingda Huang: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
Shuanyan Kang: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
Kang Geng: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences
Nanwen Li: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences

Nature Energy, 2024, vol. 9, issue 4, 401-410

Abstract: Abstract Ion-solvating membranes (ISMs) are an alternative to proton-exchange and anion-exchange membranes for use in water electrolysers. ISMs do not have fixed ionic groups in their structure but instead gain their ionic conductivity through the uptake of liquid electrolyte. Although in principle they could offer improved stability over anion-exchange membranes due to the absence of easily degradable anion-exchange groups, stability gains have been modest. Here we report poly(oxindole biphenylene)-based ISMs with highly stable oxindole/KOH complex ion pairs for use in water electrolysers. These ISMs exhibit promising alkaline stability at 80 °C with a negligible conductivity decay over more than 15,000 h and, thus, allow durable alkaline electrolysis over 2,500 h, even at elevated temperatures and high operating voltages of 2.3 V. Moreover, they show ultralow gas permeation and, thus, low transient response times (

Date: 2024
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DOI: 10.1038/s41560-023-01447-w

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