Enhanced\nElectrochemical Energy Storing Performance\nof gC<sub>3</sub>N<sub>4</sub>@TiO<sub>2‑x</sub>/MoS<sub>2</sub> Ternary Nanocomposite

Herein, we delineate the preparation\nof a g-C<sub>3</sub>N<sub>4</sub>-added defect-induced TiO<sub>2‑x</sub>/MoS<sub>2</sub> ternary nanocomposite using a two-step hydrothermal\nmethod followed\nby a solvent-reflux process. The oxygen vacancy-incorporated TiO<sub>2‑<i>x</i></sub>, its binary TiO<sub>2‑<i>x</i></sub>-MoS<sub>2</sub>, and ternary gC<sub>3</sub>N<sub>4</sub>@TiO<sub>2‑<i>x</i></sub>-MoS<sub>2</sub> nanocomposites are evaluated by different structural, morphological,\nand compositional property measurement techniques. Further, the electrochemical\ncharge-storage performance is measured by fabricating a supercapacitor\nin a three-electrode as well as a two-electrode system. The 30 wt\n% g-C<sub>3</sub>N<sub>4</sub> (among 20, 30, and 40% gC<sub>3</sub>N<sub>4</sub>)-based TiO<sub>2‑<i>x</i></sub>/MoS<sub>2</sub> shows a very high specific areal capacitance of 1351.47 mF·cm<sup>–2</sup> at a current density of 0.5 mA·cm<sup>–2</sup>. An extraordinary cycling stability with 90% capacity retention\nafter 5000 cycles at a current density of 4 mA·cm<sup>–2</sup> is achieved. Moreover, an asymmetric supercapacitor (ASC) is fabricated,\nobtaining an outstanding volumetric energy density of 784.31 mWh·cm<sup>–3</sup> and a power density of 9 W·cm<sup>–3</sup> with an extraordinary capacity retention of up to 95% after 5000\ncycles. Thus, it is demonstrated that the ternary nanocomposite electrode\nhas an outstanding potential to exhibit remarkable capacitance with\nenhanced cyclic stability.