A self-supporting multi-component collaborative structure for enhancing interface electron transfer in hybrid supercapacitor

Multi-component synergistic effect is a feasible strategy to boost the capacity of electrode materials. Herein, carbon nanotubes (CNTs) film supporting NiCo phosphide (NiCoP) modified metal-organic framework (MOF) is reasonably synthesised as a self-supporting electrode for high-performance supercapacitors. Benefiting from the synergistic effect of the high conductivity of the CNT film substrate, the specific surface area of Cu-MOF (HKUST-1), and the high activity of NiCoP, the charge transfer and ionic diffusion among the electrode greatly improved. The as-prepared electrode displays a remarkably enhanced specific capacitance of 1154 F g−1. In addition, the as-assembled NiCoP/HKUST-1@CNTs//activated carbon supercapacitor possesses a considerable energy density of 58.2 W h kg−1 and satisfactory cyclic performance (retaining 80.6 % capacitance over 10,000 cycles). The synthesis approach of this study provides some reference for the controllable preparation of new high-capacity MOF-based electrode materials.