Graphene/mesoporous carbon/ZIF-derived carbon heterostructures via interface-reinforced assembly for capacitive energy storage

Abstract

We report the synthesis of three-dimensional (3D) graphene/mesoporous carbon/ZIF-derived microporous carbon (G/MC/ZDC-A) heterostructures through an interface-reinforced assembly. This hierarchical architecture synergistically integrates 2D graphene nanosheets with 0D ZDC nanoparticles via a mesoporous carbon “binder”, effectively mitigating the agglomeration issue while establishing continuous charge transport pathways. When configurated as symmetric supercapacitors with EMIMBF₄ electrolyte, the obtained G/MC/ZDC-A demonstrates decent capacitive performance: a high specific capacitance (240 F g⁻¹ at 0.5 A g⁻¹) and excellent cyclability (86% capacitance retention over 10 000 cycles).