Enhancing supercapacitor energy density by TiN-ZnS composites unveiled as a promising electrode

Abstract

This work describes a low-cost wet chemical synthesis technique to produce TiN-ZnS nanocomposites suitable for high energy density supercapacitors. Ti, Zn, N, and S elements in the synthesized materials were verified using comprehensive morphological, structural, and surface chemical investigations. Due to improved electric conductivity and electroactivity, this TiN-ZnS nanocomposite electrode exhibited excellent capacitance and charge transport kinetics, outperforming individual TiN and ZnS electrodes in electrochemical performance. The TiN-ZnS || MnO2 electrode configuration in an asymmetric supercapacitor system exhibited a high energy density of 74.13 Wh kg−1 and an exceptional power density of 7648 W kg−1 at a current density of 9 A g−1. The TiN-ZnS electrode also showed a remarkable retention rate of 96.8% even after 10 000 cycles. This work highlights the potential of the TiN-ZnS composite as a high-performance electrode for supercapacitors.