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

摘要： This work explored a promising supercapacitor electrode material (WO3-rGO hybrids) synthesized by 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 photo-electron spectroscopy, Brunauer-Emmett-Teller analysis) were employed in furtherance to explore the structural, morphological, compositional and surface areal property of the prepared materials. The enhancement in electrochemical supercapacitive properties were evaluated from pure hexagonal phased WO3 to the various hybrids depending upon 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 WO3 (94.22 F/g) at a current density of 4 A/g with a 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.