Effects of the graphene content and the treatment temperature on the supercapacitive properties of VOx/graphene nanocomposites

Mesoporous Hybrids of Reduced Graphene Oxide and Vanadium Pentoxide for Enhanced Performance in Lithium-Ion Batteries and Electrochemical Capacitors

“…All the charge-discharge curves show highly symmetric and nearly linear features in the applied voltage window with a very small "IR drop", indicating an ideal supercapacitor behavior. 51 The specific capacitance C0 can be also calculated using charge-discharge data by the following equation:…”

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

“…Further,t he obtained GV-3 electrodev aluesa re higher and comparable to previously reported values. [16,19,[25][26][27]30] Further to understand the electrochemical reversibility of the GV-3 electrode( for GV-1 and GV-2 (FigureSa,b): see Section Ei nS upporting Information), additional CV studies were performed at various scan rates in 1 m Na 2 SO 4 electrolyte solution (Figure 3c). As the scan rate increased,t he integrated areas under the CV curves also increased, which is at ypicalr esult of adsorption and desorption characteristics of the electric double-layer capacitors (EDLCs).…”

“…Va rious investigations have been performed on the synthesis of graphene-V 2 O 5 composites as an electrodem aterials for supercapacitors. [19,[25][26][27][28][29][30][31][32] Xu et al [25] synthesized graphene/ In this study,w er eport the faciles ynthesis of reduced graphene oxide/vanadium pentoxide (GV) composites and the application of this material towards the supercapacitor application. Thea s-fabricated reduced graphene oxide/vanadium pentoxide (GV-3) composite electrodes displayed outstanding electrochemical performancew ith am aximums pecific capacitanceo f2 50 Fg À1 at 5mVs À1 and excellent cycling stability,r etaining 95 %o ft he initial capacitance,e ven after 5000 cycles,w hich shows improved behavior compared to rGO and V 2 O 5 .F urther, the synthesis processi ss imple,l ess time consuming, and requires no sophisticatedi nstruments.…”

“…These results indicate that the reduced graphene oxide/vanadium pentoxide composite electrode can be usefulf or improvedhigh-performance supercapacitors. V 2 O 5 xerogel nanocomposites by using ah ydrothermal methoda nd obtained am aximum specific capacitance of 195.4 Fg À1 at ac urrent density of 1Ag À1 in a0 .5 m K 2 SO 4 solution.Bonso et al [26] prepared exfoliated graphite nanoplatelets and aV 2 O 5 nanotube composite,which exhibited aspecific capacitance of 35 Fg À1 in aqueouse lectrolyte (2 m KCl) and 226 Fg À1 in organic electrolyte (1 m LiTFSI in acetonitrile) at as can rateo f1 0mVs À1 .L ee et al, [19] Zang et al, [27] and Hu et al [28] also synthesized rGO/V 2 O 5 composites by using ah ydrothermal methoda nd the composite showed high specific capacitances of 288 Fg À1 (10 mV s À1 ), 320 Fg À1 (1 Ag À1 ), and 384 Fg À1 (5 mV s À1 ), respectively.T hangappan et al [29] obtainedg raphene oxide-V 2 O 5 compositen anofibers by electrospinning, which showedahigh specific capacitance of 453.8 Fg À1 at as can rate of 10 mV s À1 .V O x /graphene [30] and V 2 O 5 /rGO [31] composites synthesized using as olvothermal process and subsequent annealing process showed capacitanceso f1 88 Fg À1 (0.5 Ag À1 )a nd 537Fg À1 (1 Ag À1 ), respectively.W ue ta l. [32] prepared the V 2 O 5 /graphene hybrid aerogel-based supercapacitors using as ol-gel methoda nd they exhibited ane nhanced specific capacitance 486 Fg À1 at 0.5 Ag À1 .A lthough enhanced electrochemical performance has been reported by many researchers,w eb elievet hat there is still considerable possibility for improvingt he synthesis and properties of the electrode materials for supercapacitors. In addition, most of the above-mentioned methods require long reaction times,h igh cost, and high processing temperatures,w hich would hinders the large-scale production of the electrode materials.…”

Frequency and voltage dependence of dielectric properties, complex electric modulus, and electrical conductivity in Au/7% graphene doped‐PVA/n‐Si (MPS) structures

“…Graphene exhibits several unique properties such as high carrier mobility, high mechanical strength, and high transparency in the visible range, tunable bandgap, high surface area (∼2600 m 2 /g) . Graphene was discovered by Geim's group in 2004 and since then, it has aroused tremendous scientific and industrial interest .…”