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A new strategy for controlled synthesis of a MOF composite with a core-shell structure, ZIF-8@resorcinol-urea-formaldehyde resin (ZIF@RUF), is reported for the first time through in situ growth of RUF on the surface of ZIF-8 nanoparticles via an organic-organic self-assembly process by using hexamethylenetetramine as a formaldehyde-releasing source to effectively control the formation rate of RUF, providing the best opportunity for RUF to selectively grow around the nucleation seeds ZIF-8. Compared with the widely reported method for MOF composite synthesis, our strategy not only avoids the difficulty of incorporating MOF crystals into small pore sized materials because of pore limitation, but also effectively guarantees the formation of a MOF composite with a MOF as the core. After carbonization, a morphology-retaining N-doped hierarchical porous carbon characterized by its highly developed microporosity in conjunction with ordered mesoporosity was obtained. Thanks to this unique microporous core-mesoporous shell structure and significantly enhanced porosity, simultaneous improvements of CO 2 adsorption capacity and kinetics were achieved. This strategy not only paves a way to the design of other core-shell structured MOF composites, but also provides a promising method to prepare capacity- and kinetics-increased carbon materials for CO 2 capture.

rsc advances

Facilely controlled synthesis of a core-shell structured MOF composite and its derived N-doped hierarchical porous carbon for CO<sub>2</sub> adsorption

Facilely controlled synthesis of a core-shell structured MOF composite and its derived N-doped hierarchical porous carbon for CO2 adsorption

Facilely controlled synthesis of a core-shell structured MOF composite and its derived N-doped hierarchical porous carbon for CO₂ adsorption