Amine‐Mediated Cosolvent Polymerization for Tunable Mesoporous‐Microporous Double‐Shell Carbon Spheres toward High‐Performance Supercapacitors

Porous carbon materials attract great interest due to their wide range of applications in electrochemical energy systems, especially in structured and pore size‐tunable carbon materials prepared by template‐assisted methods. In this study, a solvent‐mediated polymerization‐induced self‐assembly strategy is designed for the synthesis of hierarchical double‐shell‐layer porous carbon nanospheres, and screened out the carbon nanospheres N‐doped hierarchical meso‐microporous carbon spheres (NPCS)‐40 with the best morphology and performance by exploring the effects of different 1,3,5‐trimethylbenzene contents, different cosolvent ratios, different cosurfactant ratios, as well as different ethylenediamine and resorcinol contents on the carbon nanospheres’ structure. The resulting carbon nanospheres exhibit a specific capacitance of 249 F g −1 in a supercapacitor with a current density of 0.5 A g −1 and 139.4 F g −1 in a symmetric supercapacitor with excellent stability, which is maintained at 117% after 5000 charging and discharging cycles.