Studies on electrochemical mechanism of nanostructured cobalt vanadate electrode material for pseudocapacitors

Arasi, S. Ezhil; Ranjithkumar, R.; Devendran, P.; Krishnakumar, M.; Arivarasan, A.

doi:10.1016/j.est.2021.102986

Cited by 28 publications

(17 citation statements)

References 27 publications

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“…Scan speeds of 10, 20, 30, 40, 50, 70, 80, 90, and 100 mV/s with a voltage window of 0.0–0.7 V were used to record various curves of fabricated electrodes. The appearance of faradic reversible redox peaks prompted by surface adsorption of ions between electrodes and electrolyte explains the double‐layer capacitance storage mechanism of fabricated electrodes 42 . The nonexistence of shape distortion in CV curves in all scan rates demonstrated the redox stability of the fabricated electrodes 42 .…”

Section: Resultsmentioning

confidence: 91%

“…The appearance of faradic reversible redox peaks prompted by surface adsorption of ions between electrodes and electrolyte explains the double‐layer capacitance storage mechanism of fabricated electrodes 42 . The nonexistence of shape distortion in CV curves in all scan rates demonstrated the redox stability of the fabricated electrodes 42 . The large integrated area of CV loops indicates that these electrodes are good double‐layer capacitive electrodes 43,44 …”

Section: Resultsmentioning

confidence: 96%

“…42 The nonexistence of shape distortion in CV curves in all scan rates demonstrated the redox stability of the fabricated electrodes. 42 The large integrated area of CV loops indicates that these electrodes are good doublelayer capacitive electrodes. 43,44 Equation (3) 45 was used to estimate the specific capacitance value of various electrodes produced using CV curves.…”

Section: Electrochemical Studiesmentioning

confidence: 87%

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Annealing optimization of graphitized Co₃O₄@CuO@NiO composite electrodes for supercapacitor applications

et al. 2022

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In recent times, carbon‐based material has received a keen interest in the fabrication of electrodes because it enhances the performance of energy storage devices. Amalgamated composites of three transition metals (Co3O4@CuO@NiO) and graphene oxide (GO) were fabricated employing the hydrothermal method. The performance of some fabricated electrodes was optimized by annealing using various temperatures, examined for supercapacitor application using a three‐electrode system. Our results indicate that Co3O4@CuO@NiO‐amalgamated electrode optimized using 100°C temperature shows enhanced features compared to deposited and other samples annealed at various temperatures. These discoveries also showed that Co3O4@CuO@NiO‐amalgamated electrode optimized using 100°C temperature delivered a specific capacitance of 1312 F/g from cyclic voltammetry analysis using 10.0 mV/s scan rate and 1258 F/g from galvanostatic charge–discharge analysis using 1.0 A/g current density. The cycling stability of electrodes annealed at 100°C was 92.5% after 10 000 cycles, indicating that annealing at 100°C enriched electrode characteristics.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 96%

Section: Electrochemical Studiesmentioning

confidence: 87%

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Annealing optimization of graphitized Co₃O₄@CuO@NiO composite electrodes for supercapacitor applications

et al. 2022

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“…29 In addition, the peaks at 657 and 567 cm −1 can be associated with the stretching vibration of the Co−O bond and Co−O−V bond in CVO samples. 30 On the one hand, the increase in the calcination temperature facilitated the peak intensity of Co−O−V and VO 4 groups and enhanced the interaction between cobalt and vanadium to form stable composite metal oxides. The strength of the Co−O−V and Co−O bond decreased in the ILs-mediated CVO samples, indicating an interaction between the Co and V phases.…”

Section: Structural Characteristics Of Cvo Precursors and Catalystsmentioning

confidence: 99%

Constructing Defective Co₃V₂O₈ Hexagonal Prism for Solvent-free Selective Oxidation of Cyclohexane: Strategy of Ionic Liquid Mediation

Wang

et al. 2023

Ind. Eng. Chem. Res.

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Oxygen vacancies (OVs) engineering is essential in the regulation of the structure and properties of the catalysts for selective oxidation. In this work, the strategy of ionic liquid (IL) mediation was successfully developed in constructing the OV-rich defective Co3V2O8 (CVO), exhibiting excellent performance in cyclohexane oxidation. Coupling the prepotency of the heating treatment, ILs constructed optimal [Bmim][Ac]-CVO-700 possesses the highest OV concentration and catalytic activity with 12.7% cyclohexane conversion accompanied by 89.6% KA oil (cyclohexanol and cyclohexanone) selectivity. Experimental investigation reveals that ILs not only regulates the morphology structure as structure-directing agents but also benefits the formation of OVs through coordination with the Co2+ and V5+. The redox cycle between Co3+/Co2+ and V5+/V4+ was accelerated via the constructed OVs, enhancing the activation of substrates and the transfer of electrons. The distinguished performance is attributed to the rich OVs, porous structure, and synergistic effect between the active metals. The structure–activity relationship between OVs concentration and cyclohexane conversion further indicated that OVs facilitate the essential steps for the generation of targeted products. The possible reaction pathway of cyclohexane oxidation over the OV-rich CVO catalyst was also suggested regarding the radical trapping experiment. This design not only presents a facile and effective strategy for constructing OVs using ILs but also provides an in-depth insight into OV-rich mixed metal oxides in selective oxidation.

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“…The color code defines the geometrical d norm function on the Hirshfeld surfacesof the composite oxides. The red spots in the d norm surface predominantly described shorter or interatomic contacts (<vdW radii) 50,…”

mentioning

confidence: 99%

1.6 V Flexible Supercapacitor Enabled by rGO-Iron Vanadium Oxide (FeVO₃) as an Anode and mw-CNT-Nickel Copper Oxide (Ni₄CuO₅) as a Cathode with High-Performance Energy Storage

2023

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The impediments confronted by flexible batteries for fabrication methodologies and lower specific power for real-time applications ameliorate the stand of flexible supercapacitors as a novel impartial executor in the storage of energy. The commendable attributes of specific energy, long-cycle stability, and rapid ion transport make supercapacitors a crucial candidate in the devices of storage of energy. Eying on these recompenses of supercapacitors, Ni4CuO5-mw-CNT and rGO-FeVO3 are fabricated for higher energy asymmetric solid-state supercapacitors through a facile solvothermal procedure delineated. The typical morphology of bimetallic oxides with crystallinity variation depicts a high surface area that grossly supersedes the sites of redox-active, which influences the diffusion of electrolyte ions and the variable-valence redox reaction with ion embolism. The synthesized oxide is investigated using X-ray diffraction, X-ray photoelectron, and Raman spectroscopy to affirm the phase and inspected by electron microscopy for structural features with BET. The Hirshfeld surface simulation analysis assists in grasping the electronic interaction to explicate the experimental consequences. An asymmetric supercapacitor (ASC) device comprising Ni4CuO5-mw-CNT as a cathode and rGO-FeVO3 as an anode is assembled. The electrochemical response of Ni4CuO5-mw-CNT and rGO-FeVO3 electrodes exhibits higher specific capacitances of ∼778.8 and ∼478 F/g at a current density of 0.4 A/g, respectively, superior long-cycle stabilities, and rate capabilities. Moreover, the convened ASC device achieves a maximum specific energy of ∼29.2 Wh/kg and a specific power density of ∼3201.6 W/kg, along with a retention of the capacitance of ∼82.6% after 10,000 cycles. The associated porous morphology network affords instantaneous accessibility of the electrolytic ions that utterly revamp the proficiency of the electrodes in the field of energy storage.

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Studies on electrochemical mechanism of nanostructured cobalt vanadate electrode material for pseudocapacitors

Cited by 28 publications

References 27 publications

Annealing optimization of graphitized Co₃O₄@CuO@NiO composite electrodes for supercapacitor applications

Annealing optimization of graphitized Co₃O₄@CuO@NiO composite electrodes for supercapacitor applications

Constructing Defective Co₃V₂O₈ Hexagonal Prism for Solvent-free Selective Oxidation of Cyclohexane: Strategy of Ionic Liquid Mediation

1.6 V Flexible Supercapacitor Enabled by rGO-Iron Vanadium Oxide (FeVO₃) as an Anode and mw-CNT-Nickel Copper Oxide (Ni₄CuO₅) as a Cathode with High-Performance Energy Storage

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Studies on electrochemical mechanism of nanostructured cobalt vanadate electrode material for pseudocapacitors

Cited by 28 publications

References 27 publications

Annealing optimization of graphitized Co3O4@CuO@NiO composite electrodes for supercapacitor applications

Annealing optimization of graphitized Co3O4@CuO@NiO composite electrodes for supercapacitor applications

Constructing Defective Co3V2O8 Hexagonal Prism for Solvent-free Selective Oxidation of Cyclohexane: Strategy of Ionic Liquid Mediation

1.6 V Flexible Supercapacitor Enabled by rGO-Iron Vanadium Oxide (FeVO3) as an Anode and mw-CNT-Nickel Copper Oxide (Ni4CuO5) as a Cathode with High-Performance Energy Storage

Contact Info

Product

Resources

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Annealing optimization of graphitized Co₃O₄@CuO@NiO composite electrodes for supercapacitor applications

Annealing optimization of graphitized Co₃O₄@CuO@NiO composite electrodes for supercapacitor applications

Constructing Defective Co₃V₂O₈ Hexagonal Prism for Solvent-free Selective Oxidation of Cyclohexane: Strategy of Ionic Liquid Mediation

1.6 V Flexible Supercapacitor Enabled by rGO-Iron Vanadium Oxide (FeVO₃) as an Anode and mw-CNT-Nickel Copper Oxide (Ni₄CuO₅) as a Cathode with High-Performance Energy Storage