One-step hydrothermal synthesis of graphene decorated V2O5 nanobelts for enhanced electrochemical energy storage

Abstract

Graphene-decorated V2O5 nanobelts (GVNBs) were synthesized via a low-temperature hydrothermal method in a single step. V2O5 nanobelts (VNBs) were formed in the presence of graphene oxide, a mild oxidant, which also enhanced the conductivity of GVNBs. From the electron energy loss spectroscopy analysis, the reduced graphene oxide (rGO) are inserted into the layered crystal structure of V2O5 nanobelts, which further confirmed the enhanced conductivity of the nanobelts. The electrochemical energy-storage capacity of GVNBs was investigated for supercapacitor applications. The specific capacitance of GVNBs was evaluated using cyclic voltammetry (CV) and charge/discharge (CD) studies. The GVNBs having V2O5-rich composite, namely, V3G1 (VO/GO = 3:1), showed superior specific capacitance in comparison to the other composites (V1G1 and V1G3) and the pure materials. Moreover, the V3G1 composite showed excellent cyclic stability and the capacitance retention of about 82% was observed even after 5000 cycles.

Synthesis of V2O5·1.6H2O/graphene composite and its application in supercapacitors

“…This confirms that GO is conductive on the dispersion of V 2 O 5 ·1.6H 2 O xerogel. It also found that the morphology of the V 2 O 5 ·1.6H 2 O/ graphene composite is difference from that in Lee's work [11,12]. In Lee's work, the growth of V 2 O 5 ·1.6H 2 O via a long time and thus long nanowires was obtained.…”

“…Recently, Lee [11,12] reported the synthesis of V 2 O 5 nanobelts on graphene by one-step hydrothermal method at 120°C for 24 h and at room temperature for 8 weeks. The synthesized composites showed excellent cyclic stability and the capacitance maintained 82 % after 5000 cycles.…”

Vanadium Pentoxide/Reduced Graphene Oxide Composite as an Efficient Electrode Material for High‐Performance Supercapacitors and Self‐Powered Systems

“…[13,14] Amongt he various electrode materials studied so far, vanadium pentoxide (V 2 O 5 )h as been considered the most promising candidate in the view of its layered structure, low cost, ease of synthesis,a bundance in nature,h igher capacity,a nd aw ide range of oxidation states varyingf rom V 2 + to V 5 + . [15][16][17][18][19][20] However, am ajor setback is the poor electric conductivitya nd structural instability,w hich hinder its ideal capacitanceb ehavior and long-term cycling stability.T oi mprove the capacitance and cyclic stability,s everals trategies have been proposed, including incorporating some materials with good electrical conductivitya nd structural stability into V 2 O 5 ,a nd forming aV 2 O 5 -conductive matrix hybrid nanostructure to obtain betterelectrochemical performance. [16,17] Recently,g raphene has emerged as one of the most appealingm aterial in variousa pplications,i ncluding supercapacitors,b atteries, and optoelectronics due to its high surface area, high flexibility, higher conductivity,a nd high thermal and chemical stabilities.…”

Fabrication and Characterization of Supercapacitors toward Self-Powered System

“…The CV curve (Figure 4a.) of the fabricated supercapacitor device showed rectangular-like shapes even at high scan rates, which is ideal capacitive and fast charge/discharge behavior of the supercapacitor device. The and it is due to inefficient diffusion of ions at higher scan rates [48,49]. Further, GCD of solid-state device was measured at various current density, which is shown in Figure 4c.…”