Symmetric pseudocapacitors based on molybdenum disulfide (MoS<sub>2</sub>)-modified carbon nanospheres: correlating physicochemistry and synergistic interaction on energy storage

Khawula, Tobile; Raju, Kumar; Franklyn, Paul J.; Sigalas, Iakovos; Ozoemena, Kenneth I.

doi:10.1039/c6ta00114a

Cited by 125 publications

(68 citation statements)

References 29 publications

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“…Whereas an obvious interior cavity with the shell thickness of ~150 nm is available in each MoS 2 /RGO hollow microsphere as disclosed by the TEM observations (Figure 3e,f), indicating the complete removal of SiO 2 template without the damage of hollow structure. Inset of Figure 3f presents a high-resolution TEM (HRTEM) image of a single random MoS 2 nanosheet anchored on a MoS 2 /RGO hollow microsphere, where the lattice fringes are clearly observable and the interplanar spacing is deduced to be 0.62 nm, corresponding to the (002) crystal plane of MoS 2 [17,28,29]. Additionally, contrastive bare MoS 2 microspheres were also hydrothermally fabricated in the presence of Na 2 MoO 4 , CS(NH 2 ) 2 and a small amount of HF.…”

Section: Resultsmentioning

confidence: 99%

Simple Synthesis of Molybdenum Disulfide/Reduced Graphene Oxide Composite Hollow Microspheres as Supercapacitor Electrode Material

et al. 2016

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MoS2/RGO composite hollow microspheres were hydrothermally synthesized by using SiO2/GO microspheres as a template, which were obtained via the sonication-assisted interfacial self-assembly of tiny GO sheets on positively charged SiO2 microspheres. The structure, morphology, phase, and chemical composition of MoS2/RGO hollow microspheres were systematically investigated by a series of techniques such as FE-SEM, TEM, XRD, TGA, BET, and Raman characterizations, meanwhile, their electrochemical properties were carefully evaluated by CV, GCD, and EIS measurements. It was found that MoS2/RGO hollow microspheres possessed unique porous hollow architecture with high-level hierarchy and large specific surface area up to 63.7 m2·g−1. When used as supercapacitor electrode material, MoS2/RGO hollow microspheres delivered a maximum specific capacitance of 218.1 F·g−1 at the current density of 1 A·g−1, which was much higher than that of contrastive bare MoS2 microspheres developed in the present work and most of other reported MoS2-based materials. The enhancement of supercapacitive behaviors of MoS2/RGO hollow microspheres was likely due to the improved conductivity together with their distinct structure and morphology, which not only promoted the charge transport but also facilitated the electrolyte diffusion. Moreover, MoS2/RGO hollow microsphere electrode displayed satisfactory long-term stability with 91.8% retention of the initial capacitance after 1000 charge/discharge cycles at the current density of 3 A·g−1, showing excellent application potential.

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Section: Resultsmentioning

confidence: 99%

Simple Synthesis of Molybdenum Disulfide/Reduced Graphene Oxide Composite Hollow Microspheres as Supercapacitor Electrode Material

et al. 2016

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“…The produced compounds such as intermediate ternary Na x MoO y and Na x WO y [54][55][56] crystalline phase could form and condense on the substrates for subsequent sulfurization. At the beginning, these Na-containing particles which were similar to PTAS and PTCDA [57] seeds could provide nucleation sites on the substrate [58,59] and then were sulfurized into the oxi-chalcogenide nanoparticles encased in a fullerene like shell [53,60].…”

Section: Growth Of MXmentioning

confidence: 99%

NaCl-assisted one-step growth of MoS₂–WS₂in-plane heterostructures

Wang¹,

Xie²,

Wang³

et al. 2017

Nanotechnology

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Transition metal dichalcogenides (TMDs) have attracted considerable interest for exploration of next-generation electronics and optoelectronics in recent years. Fabrication of in-plane lateral heterostructures between TMDs has opened up excellent opportunities for engineering two-dimensional materials. The creation of high quality heterostructures with a facile method is highly desirable but it still remains challenging. In this work, we demonstrate a one-step growth method for the construction of high-quality MoS2–WS2 in-plane heterostructures. The synthesis was carried out using ambient pressure chemical vapor deposition (APCVD) with the assistance of sodium chloride (NaCl). It was found that the addition of NaCl played a key role in lowering the growth temperatures, in which the Na-containing precursors could be formed and condensed on the substrates to reduce the energy of the reaction. As a result, the growth regimes of MoS2 and WS2 are better matched, leading to the formation of in-plane heterostructures in a single step. The heterostructures were proved to be of high quality with a sharp and clear interface. This newly developed strategy with the assistance of NaCl is promising for synthesizing other TMDs and their heterostructures.

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“…In our previous work, 12 we reported how the presence of CNS is intrinsically linked to the pseudocapacitance of MoS 2 with flower-like and spherical morphologies. The previous study suggested that different morphologies give different physico-chemical properties.…”

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confidence: 99%

“…14 In the last three years, it is interesting to observe that MoS 2 has begun to attract interest even as full cell (2-electrode) configurations. 12,[15][16][17][18][19][20] The supercapacitor performance of MoS 2 has been compared to that of the carbon nanotubes (CNT) array electrodes. 6,21 Spherical morphology of the MoS 2 remains the most investigated morphology for supercapacitor application.…”

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confidence: 99%

“…5 Molybdenum disulfide (MoS 2 ), which belongs to the family of transition-metal dichalcogenides (TMDs), has been receiving some research attention as a viable energy storage materials, both as supercapacitor and anode material for lithium-ion batteries. 6,7 As an important inorganic layered materials, MoS 2 has been shown to be an analogue of graphene, 8 and useful as hydrogen storage, 9 catalysis, 10 supercapacitors, 11 pseudocapacitors 12 and anode material for lithiumion batteries. 13 One of the active research areas of MoS 2 is in the fabrication of supercapacitors.…”

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confidence: 99%

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The Effects of Morphology Re-Arrangements on the Pseudocapacitive Properties of Mesoporous Molybdenum Disulfide (MoS₂) Nanoflakes

Khawula

Raju

Franklyn

et al. 2016

J. Electrochem. Soc.

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Mesoporous molybdenum disulfide (MoS 2 ) with different morphologies have been prepared via hydrothermal method using different solvents, water or water/acetone mixture. The MoS 2 obtained with water alone gave a graphene-like nanoflakes (g-MoS 2 ) while the other with water/acetone (1:1 ratio) gave a hollow-like morphology (h-MoS 2 ). Both materials are modified with carbon nanospheres as conductive material and investigated as symmetric pseudocapacitors in aqueous electrolyte (1 M Na 2 SO 4 solution). The physicochemical properties of the MoS 2 layered materials have been interrogated using the surface area analysis (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman, fourier-transform infrared (FTIR) spectroscopy, and advanced electrochemistry including cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), repetitive electrochemical cycling tests, and electrochemical impedance spectroscopy (EIS). Interestingly, a simple change of synthesis solvents confers on the MoS 2 materials different morphologies, surface areas, and structural parameters, correlated by electrochemical capacitive properties. The g-MoS 2 exhibits higher surface area, higher capacitance parameters (specific capacitance of 183 F g −1 , maximum energy density of 9.2 Wh kg −1 and power density of 2.9 kW kg −1 ) but less stable electrochemical cycling compared to the h-MoS 2 . The findings show promises for the ability to tune the morphology of MoS 2 materials for enhanced energy storage. One of the factors that determine the performance of any energy material, be it in catalysis, sensing, photochemistry or electric energy storage, is its morphology.1 This explains why different materials with different dimensions (zero-, one-, two-or threedimensional nanostructures) give different physico-chemical properties and applications.2 Morphology has effects on the surface area, kinetics and thermodynamic properties of the materials.3 For example, it is has been known that graphene and carbon nanotubes give different catalytic properties due to their morphologies. 4 Nanowires are known to enhance electron transport compared to nanoparticles of the same materials.

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Symmetric pseudocapacitors based on molybdenum disulfide (MoS₂)-modified carbon nanospheres: correlating physicochemistry and synergistic interaction on energy storage

Abstract: Flower-like MoS2 modified with carbon nanospheres (CNS) displays energy-storage capability when used as an aqueous symmetric pseudocapacitor.

Cited by 125 publications

References 29 publications

Simple Synthesis of Molybdenum Disulfide/Reduced Graphene Oxide Composite Hollow Microspheres as Supercapacitor Electrode Material

Simple Synthesis of Molybdenum Disulfide/Reduced Graphene Oxide Composite Hollow Microspheres as Supercapacitor Electrode Material

NaCl-assisted one-step growth of MoS₂–WS₂in-plane heterostructures

The Effects of Morphology Re-Arrangements on the Pseudocapacitive Properties of Mesoporous Molybdenum Disulfide (MoS₂) Nanoflakes

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Symmetric pseudocapacitors based on molybdenum disulfide (MoS2)-modified carbon nanospheres: correlating physicochemistry and synergistic interaction on energy storage

Abstract: Flower-like MoS2 modified with carbon nanospheres (CNS) displays energy-storage capability when used as an aqueous symmetric pseudocapacitor.

Cited by 125 publications

References 29 publications

Simple Synthesis of Molybdenum Disulfide/Reduced Graphene Oxide Composite Hollow Microspheres as Supercapacitor Electrode Material

Simple Synthesis of Molybdenum Disulfide/Reduced Graphene Oxide Composite Hollow Microspheres as Supercapacitor Electrode Material

NaCl-assisted one-step growth of MoS2–WS2in-plane heterostructures

The Effects of Morphology Re-Arrangements on the Pseudocapacitive Properties of Mesoporous Molybdenum Disulfide (MoS2) Nanoflakes

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Symmetric pseudocapacitors based on molybdenum disulfide (MoS₂)-modified carbon nanospheres: correlating physicochemistry and synergistic interaction on energy storage

NaCl-assisted one-step growth of MoS₂–WS₂in-plane heterostructures

The Effects of Morphology Re-Arrangements on the Pseudocapacitive Properties of Mesoporous Molybdenum Disulfide (MoS₂) Nanoflakes