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

Herein, we delineate the preparation of a g-C3N4-added defect-induced TiO2-x/MoS2 ternary nanocomposite using a two-step hydrothermal method followed by a solvent-reflux process. The oxygen vacancy-incorporated TiO2-x, its binary TiO2-x-MoS2, and ternary gC3N4@TiO2-x-MoS2 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-C3N4 (among 20, 30, and 40% gC3N4)-based TiO2-x/MoS2 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.