Current progress in vanadium oxide nanostructures and its composites as supercapacitor electrodes

In recent years, vanadium oxides have gained immense attention in the field of energy storage devices due to their low-cost, layered structure and multi-valency despite their limited electrical conductivity and lower structural stability. In this brief review, we have tried to focus on electrochemical properties of the stoichiometric vanadium oxides along with VO_x composites. The morphology engineering, doping with heteroatom and formation of composites with carbon-based materials and/or conducting polymers in enhancing the supercapacitive performances of the vanadium oxides are discussed in details. Finally, the potentiality and challenges of vanadium oxides nanocomposites for supercapacitor applications are discussed.