Facile Production of Mesoporous WO₃-rGO Hybrids for High-Performance Supercapacitor Electrodes: An Experimental and Computational Study

Abstract

This work explored a promising supercapacitor electrode material (WO 3 -rGO hybrids) synthesized via a simplistic one-pot hydrothermal synthesis route. Various analytical studies (X-ray diffraction study, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer−Emmett−Teller analysis) were employed in furtherance to explore the structural, morphological, compositional, and surface areal properties of the prepared materials. The enhancement in electrochemical supercapacitive properties were evaluated from pure hexagonal phase WO 3 to the various hybrids, depending on the concentration of GO introduced into it, using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The WG-80 composite revealed the high rise in capacitance value of 801.6 F/g overcoming the individual capacitance of rGO (71.11 F/g) and WO 3 (94.22 F/g) at a current density of 4 A/g with good cycling stability (75.7%) over 5000 cycles. We have presented quantum capacitance from ab initio calculations and provided theoretical explanation from the orbital interactions.

Two‐Dimensional Layered Metallic VSe2/SWCNTs/rGO Based Ternary Hybrid Materials for High Performance Energy Storage Applications

“…These enhancements usually arise from the synergistic effects between the carbonaceous materials and the TMDs. Samal et al described the synergistic effect observed in the WO 3 /rGO composite electrode as due to the charge transfer between WO 3 and rGO sheets . The hybrid electrode material made from pseudocapacitive VSe 2 , EDLC type reduced graphene oxide and carbon nanotube enhances the power density and the cyclic stability of the electrode.…”

MnO2/ZnCo2O4 with binder-free arrays on nickel foam loaded with graphene as a high performance electrode for advanced asymmetric supercapacitors

“…In the high frequency region, as the electrodeposition time increases, the intercepts with the real axis decrease gradually, which means the equivalent series resistance becomes lower. 21,22 When the electrodeposition time is 45 min, the equivalent resistance of the electrode is 0.66 U lower than those of the other electrodes. When the electrodeposition time exceeds 45 min, it can be seen from the low-frequency and high-frequency regions that excess MnO 2 aggregation prevents the transfer of ions/electrons, which reduces the electrochemical performance of the electrode.…”

Partially Graphitized Iron-Carbon Hybrid Composite as Electrochemical Supercapacitor Material

“…The specific capacitance was calculated from CV and GCD were using by following equation (1) and (2) respectively. 13…”

“…In the field of mesoporous materials, carbon-based functional materials represent the most investigated electrode materials for energy storage applications due to their excellent electrochemical activity as well as other advantages, including low costs and environmental friendliness. 1 A gazillions of strategies have been attempted by choosing different precursors to design supercapacitor with pseudocapacitive electrodes of carbon and oxides of iron, 4-8 manganese, 9 cobalt 10 , vanadium, 11 ruthenium, 12 tungsten, 13 nickel 14 and mixed metals [15][16][17][18][19] for the enhanced electrochemical properties. 4 For carbon composite chemistry, activating agents (e.g ZnCl2, KOH, H3PO4, K2CO3) are used to enhance the surface area, unique porosities and activity which add an extra step in synthesis.…”