Multi-layer unbonded nickel foam/carbon nanotube array/Ni-Co bimetallic sulfide as high-performance electrode materials for supercapacitors

Abstract

Herein, we applied the idea of layered preparation, using nickel foam as the prepared substrate, carbon nanotubes as the structural stabilizer, and using the pseudocapacity performance advantage of Ni-Co bimetallic sulfide to prepare multistage NF/CNTs/Ni-Co-S composite electrode materials step by step. After the electrochemical performance test, the specific capacitance of NF/CNTs/Ni-Co-S electrode was 2952F/g at 1A/g, and the capacitance value remains 82.9% after 6000 cycles, showing good electrochemical performance. After assembly into NF/CNTs/Ni-Co-S//AC device, the maximum energy density was 76.37 Wh/kg at 799.99 W/kg power density, which indicates that the research and preparation of NF/CNTs/Ni-Co-S composite materials not only are useful for the practical application of electrode materials but also provides a novel idea to construct nanomaterials with a double-layer heterojunction. The preparation method of NF/CNTs/Ni-Co-S electrode material was simple and mild.