Titanium Based Metal Organic Frameworks Derived TiO2/Carbon/MoS2 Heterostructures for Energy Storage Applications

Wednesday, 12 October 2022: 14:20
Room 216 (The Hilton Atlanta)
V. Shrivastava (CSIR-Central Scientific Instruments Organisation), S. Sundriyal (CSIR National Physical Laboratory New Delhi), M. Sundriyal (CSIR-Central Scientific Instruments Organisation), P. Dubey (CSIR_NATIONAL PHYSICAL LABORATORY), U. K. Tiwari (CSIR-CSIO), and A. Deep (CSIO CHANDIGARH)
The industrialization of the world and the shift from non-renewable to the renewable energy is demanding advanced energy storage devices having high energy and power density. The conventional activated carbon can high power density based on fast adsorption/desorption of electrolyte however suffers from low energy density. In this work, we have synthesized hybrid composites of TiO2/Carbon/MoS2 (TCM) from MIL-125 (Ti) having TiO2 nanoparticles and layered MoS2 as a redox active agent and a 3D porous carbon structure for the adsorption of electrolyte. MIL-125 (Ti) which is basically a Ti-based MOF has been used to derive uniformly infused TiO2 nanoparticles in spherical 3D carbon structure. The uniformly doping of TiO2 in carbon structure will provide superior redox activity with minimum probability of aggregation of TiO2 whereas the 3D porous structure of carbon can provide conductive pathways with adsorption sites for electrolyte. Further the TiO2/Carbon structure has been integrated with 2D MoS2 structure through ultrasonication mixing. The MoS2 layers will provide the effective pathways for the electrolyte diffusion for the thick electrode system with extra benefit of redox activity, mechanical stability, and layer to inhibit the aggregation of TiO2/carbon spherical structure. After various characterization, including XRD, Raman, FTIR, FESEM, and BET, the TCM has been applied for aqueous supercapacitor application using 1M H2SO4 as an electrolyte. The high performance of tri-composite (TCM) (100 F/g at 3 A/g) when compared to TiO2/Carbon (50 F/g) and MoS2 (40 F/g) can be attributed to the improved electrolyte diffusion, redox activity, and conductive pathways.