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Zuyu Li, Pingxia Zhang, Min He, Lihua Wang, Zhi Qiu, Yanbin Yun. Polybenzimidazole anionic exchange membrane with hydrophobic clusters for efficient electrochemical CO2 reduction. Green Energy&Environment. doi: 10.1016/j.gee.2026.01.002
Citation: Zuyu Li, Pingxia Zhang, Min He, Lihua Wang, Zhi Qiu, Yanbin Yun. Polybenzimidazole anionic exchange membrane with hydrophobic clusters for efficient electrochemical CO2 reduction. Green Energy&Environment. doi: 10.1016/j.gee.2026.01.002
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Polybenzimidazole anionic exchange membrane with hydrophobic clusters for efficient electrochemical CO2 reduction

doi: 10.1016/j.gee.2026.01.002

  • a. Key Laboratory of Science and Technology on High-tech Polymer Materials, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;

  • b. College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China

Funds:

D Program of China (2023YFB4006200)

The Junior Fellow Program of BeiJing National Laboratory for Molecular Sciences(2024BMS20152).

This work was supported by the National Key R&

  • Received date 21 October 2025, Accepted date 07 January 2026, RevRecd date 17 December 2025, Available online 15 January 2026
    Abstract
  • Specific anion exchange membranes (AEMs) are vital to highly efficient electrochemical CO2 reduction (ECR) which is a perspective choice for the carbon neutrality. However, the unexpected trade-off effect originated from the ion conductivity and the hydrogen evolution reaction (HER) is still a great challenge. Herein, AEMs with hydrophobic clusters distribution in hydrophilic domain were designed and prepared by special ternary-polymerization polybenzimidazole (TP-PBI). The hydrophilic domain contributed to high ionic conductivity and dispersed hydrophobic clusters inhibited the membrane swelling and consequently the HER. As a result, an increase of 157% was achieved in ionic conductivity compared with that of OPBI and the prepared TP-PBI membranes exhibit CO faraday efficiency (FEco) as high as 96.2%, outstanding in situ durability for 24 h at 100 mA·cm-2. Such TP-PBI membranes throw new light on the development of AEMs for highly efficient ECR.

     

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