Enhanced Electrochemical Energy Storing Performance of gC₃N₄@TiO_2-x/MoS₂ Ternary Nanocomposite

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