Enhanced Electrochemical Energy Storing Performance of gC<sub>3</sub>N<sub>4</sub>@TiO<sub>2-x</sub>/MoS<sub>2</sub> Ternary Nanocomposite
Kunal Roy, Navya Rani Marilingaiah, Tathagata Sardar, Rita Joshi, Manikanta P. Narayanaswamy, Jagadeesh Babu Sriramoju, C. V. Yelamaggad, Ashwin C. Gowda, Dinesh Rangappa
Abstract
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.