Abstract
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 focused on electrochemical properties of the stoichiometric vanadium oxides along with VOx 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 detail. Finally, the potentiality and challenges of vanadium oxides nanocomposites for supercapacitor applications are discussed.
Highlights
In recent time, supercapacitors (SCs) are one of the emerging technologies used for clean energy prospect
We have focused on electrochemical properties of the stoichiometric vanadium oxides along with VOx composites
Carbon materials, conducting polymers, and metal oxide or hydroxides are reported to be suitable candidates as electrodes for SC [1,2,3]. Carbon materials such as activated carbon, carbon nanotube and graphene provide excellent electrical conductivity and chemical stability [4], they come with narrow charge storage capacity and relatively low energy density [1]
Summary
Supercapacitors (SCs) are one of the emerging technologies used for clean energy prospect. VO2 nanoporous structures on carbon fiber in the M1 phase (Figures 1e and 1f) exhibit a specific capacitance of 20.7 mF·cm−2 at the current density of 0.3 mA·cm−2 [40]. It demonstrates capacitance retention of 93.7% and coulombic efficiency of 98.2% for 5000 charge-discharge cycles. The similar nanoporous structures in M2 and T phases of VO2 show poor specific capacitance (Figure 2a) as well as cyclic stability (Figure 2b) because of mixed valency [40] Another way to enhance the electrochemical performance of VO2 is by combining with carbon materials, which improve the electrical conductivity. VO2@Polyaniline coaxial nanobelts (Reactive templated organic layer on solvothermally grown VO2nanobelt)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
