Fabrication of vertically aligned CNT- vanadium oxide hybrid architecture with enhanced compressibility and supercapacitor performance

Abstract

The demand for energy storage devices in wearable electronics effectuates a requisition for compressible and flexible supercapacitors with high performance and mechanical reliability. We report the fabrication of vanadium oxide hybrid with VACNT and its electrochemical supercapacitor (ES) performance along with the compression response. Compressive modulus of 730 ± 40 kPa is obtained for bare VACNT forest whereas its hybrid with vanadium oxide shows a compressive modulus of 240 ± 60 kPa. Controlled CVD process enabled the formation of porous CNT architecture coated with vanadium oxide particles due to the simultaneous reduction of V2O5 and partial oxidation of CNT forest. Vanadium oxide decorated on vertically aligned carbon nanotubes acts as the active material for supercapacitor applications. A 17 folds increase in areal capacitance and 36 folds increase in volumetric capacitance are observed on depositing vanadium oxide particles on VACNT forest. High coulombic efficiency of 97.8 % is attained even after 10,000 charge-discharge cycles indicating high stability of the hybrid.

Porosity-Engineered CNT-MoS2 Hybrid Nanostructures for Bipolar Supercapacitor Applications

“…In addition to this, the extent of electrical charge developed at the electrode/electrolyte interface relies on the area accessible to the diffusing electrolyte ions, thereby, implying that ion diffusivity plays a pivotal role in charge storage process . The availability of fully accessed high surface area interface can assist in attaining higher capacitance values. , The porous microstructure of the electrode material and the ions participating in the charging–discharging process at different electrode polarities govern the charge storage capacity of the developed material. This has been presented by means of a schematic displayed in Figure b,c.…”

“…8 The availability of fully accessed high surface area interface can assist in attaining higher capacitance values. 8,61 The porous microstructure of the electrode material and the ions participating in the charging−discharging process at different electrode polarities govern the charge storage capacity of the developed material. This has been presented by means of a schematic displayed in Figure 6b,c.…”

“…It is comprehended that it exhibits excellent Coulombic efficiency with ∼102.5% and higher stability with the capacitance change of ∼180% over 7000 GCD cycles at 1 mA cm −2 current density in negative potential as shown in Figure S10. The observed upsurge in Coulombic efficiency and capacitive change might be due to the opening of more internal pores of the electrode and its structural activation during the charge−discharge cycling process 61 as revealed by FESEM images in Figure S11. This was further endorsed by the CV curves accumulated before cycling and after cycling.…”

High-performance electrode of ZIF-67 metal-organic framework (MOF) loaded laser-induced graphene (LIG) composite for all-solid-state supercapacitor

“…However, green energy, such as wind energy, solar energy, and hydroenergy, is often limited by temporal, seasonal, and geographical factors, and therefore needs to be efficiently stored and rationally utilized [1,2]. As a kind of emerging electric energy storage device, supercapacitors (SCs) have gradually played a key role in industrial production and human life [3,4]. Owing to their merits of high power density, superb cycle life and distinguished stability, SCs have been successfully applied in fields such as new energy vehicles, smart grids, and digital equipment [5][6][7].…”