Rapid hydrothermal green synthesis of core-shell-shaped NiCo2O4@MoS2/RGO ternary composites for high-performance electrode materials

Abstract

RGO-based composites possess great potential as materials for supercapacitors owing to their remarkable properties such as high specific surface area and electrical conductivity. Herein, this work presents an investigation on ternary composite electrode materials composed of RGO, NiCo2O4, and MoS2. The chemical insertion method was employed to overcome the issue of RGO layer repacking. By means of a rapid green hydrothermal synthesis approach, conductive MoS2/RGO substrates were successfully fabricated, and subsequently, NiCo2O4@MoS2/RGO core–shell-shaped composites were prepared using the MoS2/RGO substrates. The ternary NiCo2O4@MoS2/RGO composites were composed of uniformly distributed conductive MoS2/RGO substrates embedded with NiCo2O4 core microspheres. Remarkably, the NiCo2O4@MoS2/RGO composites, used as electrode materials in supercapacitors, exhibited an exceptional specific capacitance of 946 F g-1 at 1 A g-1, improved rate capacity, and demonstrated outstanding electrochemical stability while maintaining 87.3 % retention after 5000 consecutive charge–discharge cycles. The exceptional integrated performance of these composites renders them promising electrode materials for electrochemical supercapacitors.