Superior Li-ion storage of VS₄ nanowires anchored on reduced graphene

Abstract

Kinetic study on VS4 nanowires anchored on rGO for lithium ion storage.

Strengthening the Interface between Flower‐Like VS4 and Porous Carbon for Improving Its Lithium Storage Performance

“…[ 34 ] The peaks around 872 cm −1 of other three VS 4 −HC composites are ascribed to the V−C linkage between VS 4 and HC materials. [ 35,36 ] In addition, it should be noted that extra peaks around 830 and 920 cm −1 of other three VS 4 −HC composites are owing to the stretching of V−O, indicating that not only V−C bond but also V−O linkage exists in the interface, [ 37 ] which will be discussed later. The FTIR spectra shows that bridged S 2− (V−S−S) and terminal S stretching of VS 4 are at 547 and 980 cm −1 , respectively.…”

“…The FTIR spectra shows that bridged S 2− (V−S−S) and terminal S stretching of VS 4 are at 547 and 980 cm −1 , respectively. [ 24,37 ] Except for the characteristics of VS 4 , another peak around 1624 cm −1 is probably due to the redundant moisture existing among the materials from the synthesis process or absorbing from the air. [ 38 ] To investigate functional groups on the surface of carbon, the FITR spectra of C and HC are shown in Figure S1, Supporting Information.…”

V3S4 Nanosheets Anchored on N, S Co-Doped Graphene with Pseudocapacitive Effect for Fast and Durable Lithium Storage

“…As shown in Figure 4a, in the voltage range of 0.005–3 V under 50 mA g −1 , VS/NSG electrode delivers the initial discharge and charge capacity of 1150 and 825 mAh g −1 , respectively. The initial coulombic efficiency (ICE) of V 3 S 4 nanosheet is about 71.7%, which is much higher than that of other transition metal oxides and sulfides, such as SnO 2 [30], CoO [31], Co 3 O 4 [32], V 2 O 3 [4], and VS 4 [13]. After the initial cycle, the overlapped discharge–charge curves suggest the well reversibility of as-prepared VS/NSG.…”

“…Construction of nanostructures and composites with conductive substrates are considered an efficient route to overcome the drawbacks of bulk vanadium sulfides. For example, flower-like VS 2 nanosheets [10], VS 4 microsphere@PANI [11], VS 4 nanoparticles@CNTs [12], VS 4 nanowire [13], nanosheets, nanoparticles [14] anchored on graphene, V 2 S 3 microsphere@C [15], and V 5 S 8 –/graphite hybrid nanosheet [16,17] anodes delivered the improved Li + /Na + storage performances. According to the above works, VS 4 microsphere@PANI delivered a capacity of 755 mAh g −1 at the 50th cycle under a current density of 0.1 A g −1 [11], and the VS 4 /graphene composite exhibited a capacity of 954 mAh g −1 at the end of 100 cycles under the same current density [18].…”

Fabrication and characterisation of nanostructured Au for improved electrocatalytic performance in ethanol oxidation reaction

“…The electrocatalytic performance of samples can be affected by several factors and some are quantifiable. Recent research works have shown that surface area to volume (SA/V) ratio 124,[130][131][132][133][134][135] and surface energy content 134,[136][137][138] of samples, presence of active sites [139][140][141] and defects 134,138,[140][141][142] , as well as charge transfer rate 130,132,133,135,139 are some of the key parameters in electrochemical processes that influence the catalytic activities. For catalytic processes with noble metals, it is hard to alter the charge transfer rate by improving the conductivity, and difficult to induce defects in crystal structures due to single elemental composition.…”