Electrochemical characterization of orthorhombic tungsten trioxide hydrate for battery applications

Manuja, M.; Thomas, T. W.; John, Sam E.; Jose, Joshy; Jose, Gijo

doi:10.1016/j.jallcom.2021.159234

Cited by 8 publications

(5 citation statements)

References 59 publications

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“…The least square approach is adopted for refining the recorded data to match with theoretical profiles. Psedovoigit function in a linear combination of Gaussian and Lorentzianfunctions 14,15 is used for the better refinement following the relation,…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Assisted Ligand Conversion from 3R-MoS2 to α-MoO3 by Preserving Layered Nature

Manuja,

Thomas,

Jose

2024

J. ISAS

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All polymorphs of 2D MoS2 (1T, 2H & 3R) are layered with planes of molybdenum atoms sandwiched between two sulphur atoms (S-Mo-S layers) with intra planar covalent bonding and weak interlayer van der Waal’s interactions. Here in this work, the role of polyethylene glycol as surfactant in the formation of 3R-MoS2 is recognized. XRD and FTIR results provide structural elucidation and bonding information in the compound. More detailed crystal structure investigations and polyhedral visualizations were obtained in the Rietveld refinement procedure. The trigonal prismatic metal coordination in the 3R phase is portrayed with the ABC-ABC type layer stacking sequence. The morphology of layered 3R-MoS2 nanostructure was identified from HRTEM images and the percentage composition from FESEM mapping and EDAX analyses. Temperature dependent mass loss in the compound is monitored and the quantitative analysis confirms the complete transformation of 3R-MoS2 -MoO3 at a temperature of 398 °C. Endo and exothermic peaks in the DSC and DTA measurements help to substantiate the results. Thus the work highlights the temperature assisted conversion of sulphide (3R-MoS2 -MoO3) of molybdenum at 398°C by cleavage of S-S bonds and preserving the layered nature.

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Section: Resultsmentioning

confidence: 99%

“…FESEM micrographs of rhombohedral MoS 2 are given in Fig. 4 The morphology and its peculiar nature lead to vital applications of energy storage mechanisms 28 . Lattice fringe pattern is given in Fig.…”

Section: Resultsmentioning

confidence: 99%

Temperature Assisted Ligand Conversion from 3R-MoS2 to α-MoO3 by Preserving Layered Nature

Manuja,

Thomas,

Jose

2024

J. ISAS

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“…Moreover, fluids such as structural water, confined within crystals in layered materials, can result in rapid and reversible charge storage. Accordingly, Mitchell et al revealed that WO 3 ·2H 2 O is more capacitive than WO 3 in an electrokinetic analysis due to the hydrated layered structure. , In addition to altering their crystal structure, modifying the band structure of TMOs to increase their electronic conductivity offers a viable strategy for enhancing pseudocapacitance . Doping TMOs with V o s can increase electronic conductivity and provide redox-active sites.…”

Section: Introductionmentioning

confidence: 99%

Submerged Photosynthesis of Molybdenum–Tungsten Nanostructures for Supercapacitor Application

Lin

Jeem

Zhang

et al. 2023

ACS Appl. Nano Mater.

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Research on electrochemical energy storage devices aims to produce supercapacitors via a facile and nonpolluting method. Because of unnecessary elemental doping and disordered morphologies of nano-oxides, impurities in raw materials during the conventional fabrication process would reduce the pseudocapacitance. Herein, we propose a submerged photosynthesis crystalline method for synthesizing oxygen vacancy (Vo)-enriched Mo–W oxide hydrates and Mo-doped tungsten oxide hydrate nanocomposites at 55 °C and normal pressure. In addition, this study describes the impact of Vos on pseudocapacitance using ab initio calculations based on density functional theory. Doping the WO3·0.33H2O lattice with Mo and Vos brings the conduction band closer to the Fermi energy level. The comparison of the ultraviolet–visible–near-infrared (UV–vis–NIR) irradiation spectrum and absorption coefficient calculation suggests that Mo and Vo doping is responsible for the NIR absorption. This study concludes that enriched Vos result in the highest specific capacitance and pseudocapacitive behavior of Mo x W1–x O3·0.33H2O.

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“…26 The W atoms consist of a wider range of oxidational states varying from +2 to +6, implying WS 2 to be a favorable PC nanomaterial for SCs devices. 27 In a recent report, Manuja et al 28 fabricated a very high binary crystalline-based tungsten-trioxide (WO 3 ) and WS 2 composite material on tungsten skeleton following an excellent sulfurization/oxidation approach. This kind of layered electrode provides a seamless interface and notable electrochemical activities with outstanding long cycles.…”

Section: Introductionmentioning

confidence: 99%

Multiple structural defects in poor crystalline nickel‐doped tungsten disulfide nanorods remarkably enhance supercapacitive performance

Kumar

Al‐Asbahi

Pallavolu

et al. 2022

Intl J of Energy Research

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Summary Tailoring the multiple structure defects of nanomaterials by developing efficient construction is a captivating approach to designing unique electroactive materials for supercapacitors with performance improvement. Here, we in situ synthesize Ni‐doped tungsten disulfide nanorod arrays on nickel foam (Ni‐doped WS2/NF NRs) by a hydrothermal technique procedure. These multiple structural defects in poor crystalline Ni‐doped WS2/NF NRs construction configuration by abundant interconnected nanorods would reveal plentiful oxidational/redox‐active states that supply porous/conductive skeletons for quick electrolyte/ion electrons transportations. Favoring its doped conductive effect and synergetic structure of multiple‐like Ni‐doped on WS2, the as‐designed Ni‐doped WS2/NF NRs electrode exhibits a high specific capacity of 242.9 mAh g−1 at 1 A g−1, outstanding cycling stability of 6000 long cycles with capacity retention79.8% at 20 A g−1, which is higher than that of binary WS2 electrode. This outstanding performance arises from enhanced conductivity and richer active sites in the multiple structural electroactive materials. This research offers an efficient treatment to explore multiple structural morphologies and architectures of energy storage applications.

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Electrochemical characterization of orthorhombic tungsten trioxide hydrate for battery applications

Cited by 8 publications

References 59 publications

Temperature Assisted Ligand Conversion from 3R-MoS2 to α-MoO3 by Preserving Layered Nature

Temperature Assisted Ligand Conversion from 3R-MoS2 to α-MoO3 by Preserving Layered Nature

Submerged Photosynthesis of Molybdenum–Tungsten Nanostructures for Supercapacitor Application

Multiple structural defects in poor crystalline nickel‐doped tungsten disulfide nanorods remarkably enhance supercapacitive performance

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