Nanostructural engineered titanium dioxide by rare earth metals dual doping for electrochemical supercapacitor applications
摘要
High-porosity nanostructured materials are in high demand for use in electrochemical supercapacitor applications due to their immense specific surface areas, which allow for significant energy storage capacity. Using Ti(CH3COO)2⋅2H2O and nitrate salts of dopants such as Cerium, Samarium, Holmium, and Ytterbium as precursors, we synthesized mixed metal-doped TiO2 nanostructures using a facile sol–gel approach. The Ce/Ho Co-doped TiO2 nanostructures-based supercapacitor electrodes retained 99.28% of their capacity after 5,000 cycles, with a specific capacitance of 1714 F g−1 at a current density of 2.0 A g−1. The enhanced electrochemical performance of the optimized Co-doped TiO2 nanostructures can be attributed to the increased TiO2 conductivity due to the optimization of co-doping and the increased specific surface area as a result of structural porosity. These results suggest that porous co-doped TiO2 nanostructures have a wide spectrum of potential electrochemical applications.