Supercapacitor Electrodes Based on Layered Tungsten Disulfide-Reduced Graphene Oxide Hybrids Synthesized by a Facile Hydrothermal Method

Ratha, Satyajit; Rout, Chandra Sekhar

doi:10.1021/am403663f

Cited by 411 publications

(243 citation statements)

References 55 publications

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“…While the 1T-polytype 33 of MoS2 has demonstrated high capacitance, electrodes made from the 2H-polytype of a number of TMDs have shown lower performances. [66][67][68][69][70] Because the aim of this work is not to demonstrate high-performance supercapacitors but to explore the effect of nanosheet dimensions on the performance of supercapacitor electrodes, we have opted to use size-selected 2H-WS2 nanosheets as a model system. An EDLC stores energy by localising non-Faradic charges at an electrode-electrolyte interface.…”

Section: Dependence Of Double Layer Capacitance On Nanosheet Sizementioning

confidence: 99%

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

et al. 2016

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Although many electrochemical properties of 2D materials depend sensitively on the nanosheet dimensions, there are no systematic, quantitative studies which analyse the effect of nanosheet size and thickness on electrochemical parameters. Here we use size-selected WS2 nanosheets as a model system to determine the effect of nanosheet dimensions in two representative areas -hydrogen evolution electrocatalytic electrodes and electrochemical double layer capacitor electrodes. We chose these applications as they depend on the interaction of ions with the nanosheet edge and basal plane, respectively, and so would be expected to be nanosheet-size-dependent. The data shows the catalytic current density to scale inversely with mean nanosheet length while the volumetric double layer capacitance scales inversely with mean nanosheet thickness. Both of these results are consistent with simple models allowing use to extract intrinsic quantities, namely the turnover frequency and the double layer thickness respectively.3

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Section: Dependence Of Double Layer Capacitance On Nanosheet Sizementioning

confidence: 99%

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

et al. 2016

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“…The W 4f XPS spectra of the hybrid exhibits peaks observed at 33.5 eV and 31.3 eV, corresponding to the W 4f5/2 and W 4f7/2 characteristic peaks of WS 2 -NTs ( Figure 3B). As for the peak at 36.9 eV, we assign it to the W-O bond, indicating a low surface oxidation 25 . The presence of WS 2 -NTs can be further confirmed by the two distinct S 2p peaks at 161.9 eV and 163.2 eV, which correspond to the S 2p3/2 and S 2p1/2 components of WS 2 -NTs ( Figure 3C).…”

mentioning

confidence: 99%

Free-Standing Hierarchically Sandwich-Type Tungsten Disulfide Nanotubes/Graphene Anode for Lithium-Ion Batteries

Chen

Zhao

Wu³

et al. 2014

Nano Lett.

275

216

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This is the accepted version of the paper.This version of the publication may differ from the final published version. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 Rechargeable lithium ion batteries (LIBs) have long been considered as the most effective energy-storage technology and dominated portable electronic market for over two decades. Permanent repository link1, 2 Based on the intercalation mechanism, state-of-the-art Li-ion technology can exhibit a theoretical specific energy of ~400 Wh/kg, such as LiCoO 2 /graphite system. 3 However, it is urgent to explore new chemistries and materials that can significantly increase the cell energy density, considering the future demand for electronic vehicles and large-scale energy storage plants. 4,5 Graphite, a widely used anode material for the current LIBs, has a theoretical capacity of only 372 mAh/g, given a fully intercalated LiC 6 compound, which is one of the limiting factors for achieving high energy density of the cell 6 . In order to overcome such technical bottleneck, considerable effort has been devoted to design and synthesise new anode materials with higher theoretical specific capacity, such as transition metal oxides (SnO 2 , Co 3 O 4 ,Fe 3 O 4 ), Sn and Si 7 . However, all these materials suffer from severe volume variation during charge-discharge cycling, which results in serious pulverisation of the electrodes, and thus, rapid capacity degradation. For instance, Si has a high specific capacity of 4200 mAh/g if fully lithiated to Li 4.4 Si, however, it also shows a large volume expansion up to 400%. Such volume expansion causes huge mechanical stress of the electrode, and therefore, severely limits the lifetime of Si anode. Although various strategies have been proposed to enhance the structural stability of Si-based materials, including carbon or polymer coating 8,9 , nano-structuring 10-12 and hierarchical hybridization, [13][14][15] it is still very challenge to overcome the issue of the inherent volume change of these materials during cycling.Transition metal dichalcogenides (TMD) MX 2 (M=Mo, Ti, V, and W, X=S or Se) 16,17 with the similar feature of layered structure as graphite could have great potential for alternative anode materials. In general, MX 2 has strong covalent bonds within layers and weak Van der Waals forces between layers, which provide ideal space for intercalation of lithium ions. For instance, MoS 2 has much larger spacing between neighboring layers (0.615 nm) than that of graphite (0.335 nm) and weak van der Waals forces between the layers, which, in principal, may make the Li + diffuse easier. However, certain electrochemical properties of MX 2 can only be achieved in their 1-D or 2-D nanostructured crystals because of the relatively high resistance for Li-ion transport in their bulk form. In addition, the electron conductivity of th...

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“…The separation between the two electrodes are mentioned almost constant (1 cm) in all the measurements that are reported here. The scientific reliability and the simplicity of two electrode configuration over the conventional three electrode configuration of a electrochemical cell in the study of electrochemical capacitors has been well documented by Stoller et al [12] and others [13]. The best practices on the use of this setup are well summarized by the Stoller et al [12].…”

Section: Resultsmentioning

confidence: 96%

Cyclic Voltammetric Studies on the Role of Electrode, Electrode Surface Modification and Electrolyte Solution of an Electrochemical Cell

Mundinamani¹,

Rabinal²

2014

IOSRJAC

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Supercapacitor Electrodes Based on Layered Tungsten Disulfide-Reduced Graphene Oxide Hybrids Synthesized by a Facile Hydrothermal Method

Cited by 411 publications

References 55 publications

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

Free-Standing Hierarchically Sandwich-Type Tungsten Disulfide Nanotubes/Graphene Anode for Lithium-Ion Batteries

Cyclic Voltammetric Studies on the Role of Electrode, Electrode Surface Modification and Electrolyte Solution of an Electrochemical Cell

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