Delaminated N-Ti3C2@Ni3S4 nanocomposites based high-performing supercapacitor device fabrication

In this research, we have made a breakthrough on the specific capacitance and cyclic stability of supercapacitors based on N-Ti3C2@Ni3S4 nanocomposites. These materials are prepared using in-situ growth of Ni3S4 nano-particles on nitrogen doped delaminated Ti3C2 MXene via a hydrothermal method. The phase development and surface morphology are systematically investigated using a range of characterization techniques such as X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and scanning electron microscopy (SEM). The electrochemical results demonstrate that N-Ti3C2@Ni3S4 nanocomposite has specific capacitance of 1280 Fg- 1 at 1 Ag-1 current density, higher than d-Ti3C2 MXene, N-Ti3C2, Ti3C2@Ni3S4. N-Ti3C2@Ni3S4 showed 81% cyclic stability after 20,000 cycles. Furthermore, the symmetric supercapacitor (SSC) device of N-Ti3S4@Ni3S4 demonstrated an excellent energy density of 9.4 Wh kg-1 at a power density of 604 W kg-1 and 3 Wh kg-1 at 2016 W kg- 1. N-Ti3C2@Ni3S4 nanocomposites for SSC device application make them advantageous for portable electronic devices.