Vanadium oxide nanorods as an electrode material for solid state supercapacitor

Abstract

The electrochemical properties of metal oxides are very attractive and fascinating in general, making them a potential candidate for supercapacitor application. Vanadium oxide is of particular interest because it possesses a variety of valence states and is also cost effective with low toxicity and a wide voltage window. In the present study, vanadium oxide nanorods were synthesized using a modified sol–gel technique at low temperature. Surface morphology and crystallinity studies were carried out by using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy analysis. To the best of our knowledge, the as-prepared nanorods were tested with magnesium ion based polymer gel electrolyte for the first time. The prepared supercapacitor cell exhibits high capacitance values of the order of ~ 141.8 F g−1 with power density of ~ 2.3 kW kg−1 and energy density of ~ 19.1 Wh kg−1. The cells show excellent rate capability and good cycling stability.

Surface‐Modified Mesoporous V2‐xSb2xO5‐δ Ceramics for Improving the Electrostatic Chemisorption of Methylene Blue

“…The non‐linear variation in the diameter of rods with mol fraction x can be attributed to the inhomogeneous mechanical ball milling and the agglomeration of rods is observed in higher concentrations. Comparing grain size calculated using XRD data and particle size from SEM, the as‐prepared samples contain particles with polycrystalline microrod‐like structures [64] . The micro rods are projected straight up and several non‐ordered voids can be observed in the SEM micrograph, which can accommodate gas molecules and act as a porous material [65] .…”

“…Comparing grain size calculated using XRD data and particle size from SEM, the as-prepared samples contain particles with polycrystalline microrod-like structures. [64] The micro rods are projected straight up and several non-ordered voids can be observed in the SEM micrograph, which can accommodate gas molecules and act as a porous material. [65] The elemental constituents obtained from the EDS spectrum (Table 2) revealed the weight ratios of the precursors in stoichiometric proportions as per the formulated chemical empirical formulae.…”

Carbon framework modification; an interesting strategy to improve the energy storage and dye adsorption

“…These values are similar to other EDLC/supercapacitor cells reported in the literature. [33][34][35][36][37] Fig. 7a shows the specific capacitance of cell A during B10 000 charge-discharge cycles recorded at a current density of 1.6 mA cm À2 at 1.0 V. During the first 100 cycles, the capacitance was unstable, possibly due to irreversible electrochemical reactions at the electrode-electrolyte interface.…”

Ultrasound - assisted synthesized multi-phase copper vanadate (Cu 3 V 2 O 8 /Cu 2 V 2 O 7 /Cu 0.4 V 2 O 5 ) shape-controlled nanoparticles as electrode material for energy storage applications

“…As research progresses, there is optimism that ternary oxide systems, particularly CVO, can be optimized for superior supercapacitor performance, addressing challenges such as charge/discharge kinetics, cycling stability, and overall energy density. The adaptability of ternary oxide materials provides a promising avenue for ne-tuning and optimizing materials for e cient energy storage applications, contributing to the development of advanced supercapacitor technologies [14]. A variety of chemical approaches can be employed to manufacture copper vanadate nanoparticles from multiple perspectives, including shape control, growth processes, engineering of outstanding features, and the use of common ligands such as oleylamine, aiming to overcome obstacles [15][16][17][18][19].…”