Ionic-containing hyper-crosslinked polymer: A promising bifunctional material for CO2 capture and conversion

•IHCPs with high specific surface area and tunable ion-pair active sites are fabricated by a one-pot method.•IHCPs serve as the bifunctional materials for CO2 adsorption and conversion.•IHCPs demonstrate the good CO2 uptake and excellent CO2/N2 adsorption selectivity.•IHCPs are used as recyclable catalysts for cycloaddition of CO2 and epoxides.•Excellent yields of cyclic carbonates are acquired under solvent- and co-catalyst-free conditions.