Exploring Cationic Groups in Anion-exchange Ionomers for Enhanced Electrochemical CO<sub>2</sub> Reduction
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Commercialized ionomers for electrochemical CO2 reduction (CO2R) have been reported to provide co-catalytic effects1 or modified microenvironment enhancing selectivity towards C2+ products.2 However, the effect of cationic groups in anion-exchange ionomers on CO2R remains poorly understood due to the lack of systematic studies. Herein, we present a systematic design and synthesis of styrene-based ionomers with different cationic groups. The ion-exchange capacity (IEC) of each ionomer was kept constant to investigate the cationic group effects independent of hydrophobicity. These ionomers were then employed as binders with Cu catalysts to construct electrodes. Catalytic activity and selectivity were quantitatively analyzed during the CO2R in a two-compartment cell at various applied potentials. This study provides insights into ionic groups in ionomers towards efficient and selective electrochemical CO2R. (1) C. Kim, et al., Nat. Energy, 6, 1026 (2021). (2) W. Li, et al., Nat. Energy, 7, 835 (2022).