Liquid-Assisted Sintering of Ni3s4@Co3s4 Heterojunction for Applying High-Performance Asymmetric Supercapacitors

Abstract

Nanostructures composed of transition metal sulfides (TMS) exhibit excellent electrochemical properties, rendering them well-suited for use in supercapacitor applications. Nevertheless, the conventional synthesis method restricts the synthesis of nanostructures in TMS and the investigation of the synthesis mechanism. In light of the aforementioned considerations, we put forth a novel synthesis based on Le Chatelier’s principle, namely Liquid-assisted sintering. Our approach combines the benefits of solvothermal synthesis and conventional sintering advantage. In addition to the ability to synthesize nanomaterials, our approach can to the investigation of the synthesis mechanisms. The Ni3S4@Co3S4 anode material, synthesized by the aforementioned sintering method, exhibits nanofeatures and a heterogeneous structure. The best devices with Ni2.7Co0.3S4 can achieve an energy density of 208.3 W h kg-1 at a power density of 388.7 W kg-1 and maintain an energy density of 102.8 W h kg-1 at a power density of 8046.6 W kg-1. It retains 93% of its capacity after 30,000 cycles at 15 A g-1. This work provides a new way to make nanomaterials and develop electrode materials for supercapacitors.

Keywords: Transition metal sulfide, Sodium thiosulfates, Liquid-assisted sintering, heterojunction, Preparation of nanomaterials