Inside Cover: Boosting Electroreduction of CO2 over Cationic Covalent Organic Frameworks: Hydrogen Bonding Effects of Halogen Ions (Angew. Chem. Int. Ed. 7/2023)

A hydrogen bonding strategy for achieving an excellent electrocatalytic CO2 reduction reaction performance over an imidazolium-functionalized covalent organic framework (Co-iBFBim-COF-X) is reported by Yuan-Biao Huang and co-workers in their Research Article (e202215687). The halogen anions can form hydrogen bonds with intermediates (*COOH) and thus lower the energy barrier to the formation of CO. Moreover, the water–anion interactions can repel the contact of water with the active centers, thus inhibiting the occurrence of HER.