Tantalum pentoxide functionalized nitrogen-doped reduced graphene oxide as a competent electrode material for enhanced specific capacitance in a hybrid supercapacitor device

Raj, T.N. Vinuth; Hoskeri, Priya A.; Muralidhara, H. B.; Prasanna, B.P.; Kumar, K. Yogesh; Alharthi, Fahad A.; Raghu, M.S.

doi:10.1016/j.jallcom.2020.158572

Cited by 25 publications

(4 citation statements)

References 52 publications

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“…This result is consistent with the analysis of XRD pattern. [37], respectively. In figure 6(c), the chemical states of Ta 4f consist of a Ta 4f doublet at 26.25 and 28.09 eV [38], which are attributed to the 4f 7/2 and 4f 5/2 core levels of Ta 5+ in Ta 2 O 5 [38,39].…”

Section: Sem Analysismentioning

confidence: 97%

Preparation of Ta₂O₅ nanoparticles by using cathode glow discharge electrolysis

et al. 2021

Mater. Res. Express

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Tantalum pentoxide nanoparticles (Ta2O5 NPs) were fabricated by cathode glow discharge electrolysis (CGDE) generated between a needle-like platinum wire cathode and a tantalum foil anode in 6 g L−1 Na2SO4 electrolyte solution containing 5 mL hydrofluoric acid (HF) and 0.075 g cetyltrimethyl ammonium bromide (CTAB). The chemical structure, composition and morphology of the obtained powder were analyzed by using XRD, FT-IR, SEM/EDS, XPS and UV-vis DRS. The results found that Ta2O5 NPs with orthorhombic structure and wide band gap (3.6 eV) are successfully fabricated at 500 V discharge voltage in about 3 h. CTAB as a stabilizing agent can reduce the agglomeration due to forming CTA+ and attaching the surface of the synthetic products. A possible preparation mechanism of Ta2O5 NPs is proposed. Firstly, the tantalum foil anode is oxidized to form a compact Ta2O5 layer. Then, Ta2O5 surface is etched to form soluble [TaF7]2− complexes in the presence of HF. After that, soluble [TaF7]2− complexes can react with H2O to form Ta(OH)5. Finally, Ta(OH)5 is further converted to Ta2O5 from plasma-liquid interface into solution.

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Section: Sem Analysismentioning

confidence: 97%

Preparation of Ta₂O₅ nanoparticles by using cathode glow discharge electrolysis

et al. 2021

Mater. Res. Express

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“…[35,36] Reduced graphene oxide (RGO) is a carbonaceous material with high surface area, mechanical strength, flexibility, zero bandgap, and high conductivity. [37,38] RGO is a material that can serve as the foundation for the formation of diverse nanocomposites. Doping of heteroatoms like nitrogen, sulfur, and boron are easy and also shows the enhanced activity in many applications.…”

Section: Doi: 101002/pssa202300743mentioning

confidence: 99%

Cerium Vanadate with Nitrogen Doped Reduced Graphene Oxide for Visible Light‐Driven Hydrogen Evolution and Dye Degradation

Alharthi,

Marghany,

Abduh

et al. 2023

Physica Status Solidi (a)

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The present works deals with precipitation followed by hydrothermal method for the synthesis of cerium vanadate decorated nitrogen doped reduced graphene oxide (CeV/NRGO) nanocomposite. The crystallographic and Raman spectroscopic characterization confirms the formation of CeV/NRGO nanocomposite. A computational studies on crystal structure using Material studio, confirms the presence of zircon‐like CeV with VO4 tetrahedra sharing corners and edges with CeO8 dodecahedra in CeV/NRGO nanocomposite. X‐ray photoelectron spectroscopic (XPS) analysis supports the presence of Ce in +3 and +4 oxidation state. The optical characterization shows the decreased bandgap in CeV/NRGO nanocomposite (2.03 eV) compared to pristine CeV (2.35 eV). Enhanced photocatalytic activity is observed towards hydrogen evolution in CeV/NRGO (15124 µmol) compared to CeV (7215 µmol) and NRGO (2034 µmol). In addition, CeV/NRGO, CeV and NRGO were evaluated for degradation of Alizarin Yellow (AY) and Orange G (OG) dyes in presence of visible light. CeV/NRGO managed to degrade 97 and 94 % of AY and OG, respectively in 80 min. The electron spin resonance (ESR) studies show superoxide radicals and hydroxyl ions are the active species responsible for photocatalytic reactions. Based on the Liquid chromatography‐mass spectroscopy (LC‐MS) results a possible photocatalytic mechanism has been discussed. The good stability, reusability of CeV/NRGO nanocomposite could be choice of material for energy and environmental related research.This article is protected by copyright. All rights reserved.

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“…Typically, supercapacitor assemblies consist of four components: the couple electrodes, electrolyte, a current collector, and a separator, with the electrode being the determining factor for the capacitor's primary performance. Therefore, low-resistance electrode materials are required to reduce energy loss during the charging and discharging processes [8,9]. The electrode materials must simultaneously possess physicochemical stability, good performance of charge capacity, exceptional specific capacitance values, and outstanding anti-fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Niobium Pentoxide and Its Reduced Graphene Oxide Nanocomposite for Enhanced Supercapacitor Applications

2024

IJFMR

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A simple hydrothermal synthetic route has been developed for the synthesis of perovskite lanthanum aluminate (Nb2O5) and reduced graphene oxide composite (RGO). The synthesized materials have been characterized for its morphology using, XRD, SEM, techniques. The materials are used as electrode materials for supercapacitor applications. Electron microscopic images indicate RGO sheets are densely attached to surface of Nb2O5 with perforated cage like morphology. A high specific capacitance of 751 Fg-1 at a scan rate of 2 mVs-1 was exhibited by RGO/ Nb2O5 hybrid structure electrode when compared to pure RGO (535 Fg-1) and pure Nb2O53 (175 Fg-1) electrodes at the same scan rate using cyclic voltammetry (CV). By using chronopotentiometry (CP), the RGO/ Nb2O5 hybrid structure electrode out stretched specific capacitance of 572 Fg-1 at a current density of 0.5 Ag-1 and able to retain specific capacitance (Csp) of about 427 Fg-1 even at very high current density of 10 Ag-1.RGO/ Nb2O5 composite also possesses an energy density of 179 Wh kg-1 with a maximum power density of 1500 W kg-1. From the Electrochemical Impedance Spectroscopy (EIS), the RGO/ Nb2O5 hybrid structure electrode has shown phase angle close to -90o for frequency up to 0.01Hz, suggesting that the nanocomposite electrode material approached ideal capacitor behavior.

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Tantalum pentoxide functionalized nitrogen-doped reduced graphene oxide as a competent electrode material for enhanced specific capacitance in a hybrid supercapacitor device

Cited by 25 publications

References 52 publications

Preparation of Ta₂O₅ nanoparticles by using cathode glow discharge electrolysis

Preparation of Ta₂O₅ nanoparticles by using cathode glow discharge electrolysis

Cerium Vanadate with Nitrogen Doped Reduced Graphene Oxide for Visible Light‐Driven Hydrogen Evolution and Dye Degradation

Synthesis of Niobium Pentoxide and Its Reduced Graphene Oxide Nanocomposite for Enhanced Supercapacitor Applications

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Tantalum pentoxide functionalized nitrogen-doped reduced graphene oxide as a competent electrode material for enhanced specific capacitance in a hybrid supercapacitor device

Cited by 25 publications

References 52 publications

Preparation of Ta2O5 nanoparticles by using cathode glow discharge electrolysis

Preparation of Ta2O5 nanoparticles by using cathode glow discharge electrolysis

Cerium Vanadate with Nitrogen Doped Reduced Graphene Oxide for Visible Light‐Driven Hydrogen Evolution and Dye Degradation

Synthesis of Niobium Pentoxide and Its Reduced Graphene Oxide Nanocomposite for Enhanced Supercapacitor Applications

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Preparation of Ta₂O₅ nanoparticles by using cathode glow discharge electrolysis

Preparation of Ta₂O₅ nanoparticles by using cathode glow discharge electrolysis