Supercapacitors based on two dimensional VO 2 nanosheet electrodes in organic gel electrolyte

Abstract

(a) CVs of solid state device measured at different angles (inset shows the schematic for the measurement of the bending angles and the optical image of the flexible supercapacitor device). (b) Optical images displaying lighting up of an LED using three flexible supercapacitors connected in series. Highlights  Synthesis of 2D VO2 nanosheets by hydrothermal reduction of V2O5 nanopowder.  A specific capacitance of 405 F g-1 in organic electrolyte at 1 A g-1.  An energy density of 46 Wh kg-1 at 1 Ag-1 for VO 2 based symmetric capacitor.  Fabrication of all solid state flexible supercapacitors.

The Impact of the Vanadium Oxide Addition on the Physicochemical Performance Stability and Intercalation of Lithium Ions of the TiO2-rGO-electrode in Lithium Ion Batteries

“…Due to the preservation of good properties during loading and unloading processes, relatively easy transfer of lithium ions, several degrees of oxidation (V 3+ , V 4+ , V 5+ ), ease of synthesis and lack of toxicity, they are a good basis for working with lithium-ion cells. They also provide good cycling stability [6][7][8][9]. Vanadium oxides are regularly used in research works around the world.…”

Effect of growth time on solvothermal synthesis of vanadium dioxide for electrochemical supercapacitor application

“…Wang et al prepared 3D graphene/VO 2 nanobelt for high-performance supercapacitors by hydrothermal strategy which exhibited a specific capacitance of 191 F g -1 at a current density of 1 A g -1 in 0.5 M K 2 SO 4 aqueous solution [1]. Rakhi et al reported VO 2 nanosheets electrodes in organic gel electrolyte for supercapacitor applications by hydrothermal method and the electrodes exhibited a specific capacitance of 405 F g -1 at a current density of 1 Ag -1 [18]. Xiao et al reported the composite of metastable vanadium dioxide [VO 2 (B)] nanobelts on reduced graphene oxide (RGO) layers by one-step hydrothermal process which exhibited a specific capacitance of 290.4 F g -1 at a current density of 0.2 A g -1 in 1 M Na 2 SO 4 aqueous solution [19].…”

“…Liming et al prepared VO 2 /ordered mesoporous carbon (CMK-3) composites for hybrid capacitors by solid-state reaction process which exhibited a specific capacitance of 131 F g -1 in 1 M KNO 3 aqueous solution [20]. In brief, previously reported VO 2 based electrodes are mainly composites which exhibited specific capacitance values in the range of about 130 to 430 F g -1 [10,14,18,20,21], and were not evaluated in 6 M KOH as the electrolyte. In fact, to the best of our knowledge, no report exist on the electrochemical performance of VO 2 electrode in 6 M KOH aqueous electrolyte until the present.…”

Two-Dimensional VO2 Mesoporous Microarrays for High-Performance Supercapacitor

“…Supercapacitors consisting of VO 2 /GO nanobelts possessed a capacitane value of 426 F/g at 1 A/g in the potential range of − 0.6 to 0.6 V [ 29 ]. VO 2 nanoflake arrays deposited on a carbon matrix showed capacitance values of 485 F/g at 2 A/g [ 34 ]. VO 2 /CNT nanocomposites synthesized by atomic layer deposition exhibited a capacitance up to 1550 F/g [ 30 ].…”

“…In pure VO 2 nanocrystals, insufficient control of its microstructure at nanoscale typically existed and thus leaded to unsatisfied capacitance and cycle performance. VO 2 nanosheet-based electrode materials obtained a capacitance of 150 F/g at 1 A/g [ 34 ]. Pure nanoporous VO 2 electrodes only exhibited capacitance values of 76 F/g at 1 A/g [ 33 ].…”