A high-performance watermelon skin ion-solvating membrane for electrochemical CO2 reduction

Qinglu Liu, Tang Tang, Ziyu Tian, Shiwen Ding, Linqin Wang, Dexin Chen, Zhiwei Wang, Wentao Zheng, Husileng Lee, Xingyu Lu, Xiaohe Miao, Lin Liu and Licheng Sun ()
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Qinglu Liu: Westlake University
Tang Tang: Westlake University
Ziyu Tian: Westlake University
Shiwen Ding: Westlake University
Linqin Wang: Westlake University
Dexin Chen: Westlake University
Zhiwei Wang: Westlake University
Wentao Zheng: Westlake University
Husileng Lee: Westlake University
Xingyu Lu: Westlake University
Xiaohe Miao: Westlake University
Lin Liu: Westlake University
Licheng Sun: Westlake University

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Ion-solvating membranes have been gaining increasing attention as core components of electrochemical energy conversion and storage devices. However, the development of ion-solvating membranes with low ion resistance and high ion selectivity still poses challenges. In order to propose an effective strategy for high-performance ion-solvating membranes, this study conducted a comprehensive investigation on watermelon skin membranes through a combination of experimental research and molecular dynamics simulation. The micropores and continuous hydrogen-bonding networks constructed by the synergistic effect of cellulose fiber and pectin enable the hypodermis of watermelon skin membranes to have a high ion conductivity of 282.3 mS cm−1 (room temperature, saturated with 1 M KOH). The negatively charged groups and hydroxyl groups on the microporous channels increase the formate penetration resistance of watermelon skin membranes in contrast to commercially available membranes, and this is crucial for CO2 electroreduction. Therefore, the confinement of proton donors and negatively charged groups within three-dimensional microporous polymers gives inspiration for the design of high-performance ion-solvating membranes.

Date: 2024
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DOI: 10.1038/s41467-024-51139-6

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