Design of reduced graphene oxide supported NiMoS4 to enhance energy capacity of hybrid supercapacitors

Xu, Xiaoyang; Liang, Linan; Zhang, Xiangjing; Xing, Xuteng; Zhao, Ying; Gao, Jianping; Wei, Aijia

doi:10.1016/j.colsurfa.2019.124289

Cited by 21 publications

(13 citation statements)

References 41 publications

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“…The XPS spectrum demonstrates the presence of two intense peaks at 855. 15,17,24,45 On the contrary, the high-resolution Mo 3d XPS spectra of the three composites show two broad humps corresponding to Mo 3d 5/2 (∼232.2 eV) and Mo 3d 3/2 (∼235.2 eV). The deconvoluted Mo 3d XPS shows the high content of Mo 4+ compared to Mo 6+ in VNMOR (Figure 4d) and VNMSR (Figure 4e) composites.…”

Section: ■ Introductionmentioning

confidence: 85%

“…This abnormality may be due to the doping of V in the electrode material. 15,17,30,32,45 The high-resolution XPS spectra of V 2p shows two major peaks at ∼516.5 and ∼ 524.8 eV regions corresponding to V 2p 3/2 and V 2p 1/2 for all the composites. The deconvoluted spectra of VNMOR (Figure 4g), VNMSR (Figure 4h), and VNMSeR (Figure 4i) demonstrate that the valance state of vanadium is V 4+ and V 5+ in all the composites.…”

Section: ■ Introductionmentioning

confidence: 96%

“…NMSR and VNMSR show another peak at 943.68 cm −1 due to the symmetric stretching mode of Mo−S. 45,48,49 The peak at ∼504 cm −1 (Figure 5c) is assigned to the longitudinal optical (LO) phonon mode of NiSe, and the peak is shifted to the 547 cm −1 region after V incorporation. A strong peak at ∼809 cm −1 is originated in VNMSeR due to the asymmetric stretching of metal chalcogenides.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The appearance of a broad 2D band in all the electrode materials indicates the formation of a few layers of RGO sheets in the composites. 43,45,50 UV−Vis Spectra Analysis. Figure S7b,c shows the UV−vis absorbance spectroscopy of NMXR and VNMXR.…”

Section: ■ Introductionmentioning

confidence: 99%

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Improvement of the Supercapacitor Performance of Nickel Molybdenum Chalcogenides/Reduced Graphene Oxide Composites through Vanadium-Doping Induced Crystal Strain Relaxation and Band Gap Modification

Ghosh

Samanta

Jang

et al. 2022

ACS Appl. Energy Mater.

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Metal chalcogenide/reduced graphene oxide (RGO) composites have gained significant interest as promising electrode materials for supercapacitor application. Herein, the effect of different chalcogens (O, S, and Se) on nickel-based bimetallic composites along with the addition of a scanty amount of a heteroatom (V) is investigated. Different sizes and electronegativity of the chalcogens alter the morphology of the composites. However, V doping does not change the morphology but regulates the crystalline strain, band-gap energies, and charge transfer kinetics of the materials. All these factors are very important in controlling the performance of a supercapacitor device. Among all the doped and undoped composites, Se-based electrode materials exhibit the highest supercapacitor properties. In a three-electrode configuration, the V-doped Ni-Mo selenide/RGO (VNMSeR) composite electrode exhibits the highest specific capacitance of ∼610 C g −1 (1220 F g −1 ) at 2 A g −1 current density with a superior rate capability of ∼73.7%. An asymmetric supercapacitor device has been fabricated using VNMSeR as positive and thermally RGO as negative electrode. The device exhibits a maximum energy density of ∼60.5 Wh kg −1 at a power density of 1.47 kW kg −1 and shows ∼83.4% retention (50.5 Wh kg −1 ) in energy density when the power density increases by ∼8.25-fold (12.12 kW kg −1 ).

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Section: ■ Introductionmentioning

confidence: 85%

Section: ■ Introductionmentioning

confidence: 96%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvement of the Supercapacitor Performance of Nickel Molybdenum Chalcogenides/Reduced Graphene Oxide Composites through Vanadium-Doping Induced Crystal Strain Relaxation and Band Gap Modification

Ghosh

Samanta

Jang

et al. 2022

ACS Appl. Energy Mater.

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“…The presence of tilt/curvature at the extreme potential indicates higher resistivity of the CoS electrode. [27] Moreover, less enclosed area and the non-uniform shape of the CV loops obtained at different sweep rates show the least capacitive activity of the bare CoS NWs based electrode. While the CV loops of the CoS/PPy NCs based electrodes (Figure 5b) are of uniform shape and enclosed a larger area that expresses their higher reversibility and superior gravimetric capacitance (Cg), respectively.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Wafer‐Like CoS Architectures and Their Nanocomposites with Polypyrrole for Electrochemical Energy Storage Applications

et al. 2020

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In this work, we have fabricated wafer‐like CoS and their nanocomposite with Polypyrrole (PPy) via hydrothermal and ultra‐sonication techniques. The fabrication of the nanocomposite was confirmed by XRD and FT‐IR analysis. The morphology and elemental composition of the as‐prepared CoS and their nanocomposite with PPy was investigated by FESEM and EDX analysis. The synthesized CoS/PPy nanocomposite (NCs) exhibit higher gravimetric capacitance (564 Fg−1 at 1 Ag−1) and superior cycling durability with 87.6% retention after 1000 charges/discharge cycles compared to CoS wafers, thus exhibiting as a pure pseudocapacitive electrode. The superior capacitive performance of the CoS/PPy NCs is due to wafer‐like CoS and highly conductive matrix of PPy. The porous structure of the CoS provides more sites for redox reactions, while the PPy matrix facilitates the transportation of charges via their conductive channels. Hence PPy in NCs plays a double role, one as a pseudocapacitive supplement while second as a highly conductive matrix. The fabricated CoS/PPy NCs exhibits lower electrical resistivity (2.5 × 103 Ω‐cm) than that of pristine CoS NWs (3.4 × 107 Ω‐cm), due to the presence of highly conductive matrix of PPy. The improved electrical conductivity of the CoS/PPy NCs (2.5 × 103 Ω‐cm) than the wafer‐like CoS (3.4 × 107 Ω‐cm) was confirmed by I−V measurements. Moreover, the lower charge transfer resistance (Rct, 22 Ω) of the CoS/PPy NCs during the EIS test also indicates its superior redox activity. The results of electrical and electrochemical tests show that CoS/PPy NCs can be used as a potential electrode material for higher performance pseudocapacitor applications.

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RGO nanosheet wrapped β-phase NiCu2S nanorods for advanced supercapacitor applications

Kandhasamy¹,

Preethi

Devendiran

et al. 2022

Environ Sci Pollut Res

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Design of reduced graphene oxide supported NiMoS4 to enhance energy capacity of hybrid supercapacitors

Cited by 21 publications

References 41 publications

Improvement of the Supercapacitor Performance of Nickel Molybdenum Chalcogenides/Reduced Graphene Oxide Composites through Vanadium-Doping Induced Crystal Strain Relaxation and Band Gap Modification

Improvement of the Supercapacitor Performance of Nickel Molybdenum Chalcogenides/Reduced Graphene Oxide Composites through Vanadium-Doping Induced Crystal Strain Relaxation and Band Gap Modification

Wafer‐Like CoS Architectures and Their Nanocomposites with Polypyrrole for Electrochemical Energy Storage Applications

RGO nanosheet wrapped β-phase NiCu2S nanorods for advanced supercapacitor applications

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