C yolk – shell particles for CO 2 adsorption †

Yolk–shell nanoparticles are materials with nanoparticle cores inside hollow shells. They are promising functional nanomaterials with various functionalities both on the core and shell, which can have a wide variety of applications such as catalysis, drug/gene delivery, energy storage, biosensors, and Raman scattering (SERS) technologies. Various yolk–shell nanoparticles (YSNs) with different chemical compositions have been reported such as metal NPs@SiO2, metal oxide@SiO2, metal NPs@C, metal NPs@metal oxide, metal NPs@polymer, SiO2@metal oxide, SiO2@C and polymer@ polymer by using different synthetic methods, for example, a so templating method and selective etching methods. To date, most of the reported YSNs are limited to silica, polymer, carbon and a few metal oxides. To enrich the YSNs library and meet the requirements of practical applications, synthesis of YSNs with a new composition is desirable. Porous carbons with various morphologies and structures have been widely investigated for CO2 adsorption and separation due to their large surface areas, ease of synthesis, low-cost, and high stability. The synthesis of porous carbon aerogels and xerogels via resorcinol–formaldehyde (RF) resins has been extensively reported. Taking the advantages of yolk–shell structures, such as large void space for accommodating of guest