Abstract
A series of crosslinked poly(norbornene)-based composite anion exchange membranes, PHMNHD@CN-X, with different graphitized carbon nitride (g-C3N4) contents were prepared by synthesizing new norbornene-like monomers and using g-C3N4 as filler. These membranes were utilized for CO2 reduction reaction (CO2RR). The analysis indicates that PHMNHD@CN-1, a composite membrane containing 1% g-C3N4, has a hydroxide conductivity of 51.29 mS cm−1, which is significantly higher than the hydroxide conductivity of the commercial membrane called Sustainion Grade RT, which is 30.88 mS cm−1. Meanwhile, the anion exchange membrane with filler modification, PHMNHD@CN-1, demonstrated superior electrolytic performance in a homemade membrane electrode assembly (MEA) electrolyzer, achieving a current density of 83.89 mA cm−2 at the cell voltage of 3 V. At current densities of 100 to 130 mA cm−2, PHMNHD@CN-1 displayed a higher CO Faraday efficiency (FECO%) of 92.41%. These results suggest that the modified anion exchange membrane has a promising potential for CO2RR.
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Acknowledgements
The authors extend their appreciation to Shanxi Key Laboratory of Efficient Hydrogen Storage & Production Technology, Shanxi Science and Technology Innovation Talent Team (202304051001031 and 202204051001011), and the Deanship of Scientific Research at Northern Border University, Arar, KSA (NBU-FPEJ-2024-2193-04), for funding this research work.
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The work is financially supported by the National Key R&D Program of China (Project No. 2021YFE0104700).
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Longzhi Tong: investigation, conceptualization, data analysis, writing and original draft. Limin Zhang: investigation and testing. Saad Melhi: supervision. Dalal A. Alshammari: supervision. Mohamed Kallel: supervision. Zhichao Zheng: investigation and testing. Jie Yang: review and editing; Chao Wang: supervision, review and editing
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Tong, L., Zhang, L., Melhi, S. et al. Electrochemical reduction of CO2 by graphitized carbon nitride composite anion exchange membranes: potential for high CO selectivity. Adv Compos Hybrid Mater 7, 80 (2024). https://doi.org/10.1007/s42114-024-00891-w
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DOI: https://doi.org/10.1007/s42114-024-00891-w