Synthesis of Au-V<sub>2</sub>O<sub>5</sub> composite nanowires through the shape transformation of a vanadium(<scp>iii</scp>) metal complex for high-performance solid-state supercapacitors

Rudra, Siddheswar; Nayak, Arpan Kumar; Chakraborty, Rishika; Maji, Pradip K.; Pradhan, Mukul

doi:10.1039/c8qi00325d

Cited by 28 publications

(8 citation statements)

References 36 publications

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“…Presumably, the dissolution of Fe 3 O 4 occurs due to its instability, and simultaneous growth of Fe 2 O 3 around the Au(0) nucleation center is favored under reaction conditions to form a morphologically pure Au–Fe 2 O 3 nanorod (Figure S7). Based on the experimental phenomena, it can be concluded that the dissolution–nucleation–recrystallization process suggested here is rational.…”

Section: Resultsmentioning

confidence: 76%

Redox-Mediated Shape Transformation of Fe₃O₄ Nanoflakes to Chemically Stable Au−Fe₂O₃ Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Rudra

Nayak

Koley

et al. 2018

ACS Sustainable Chem. Eng.

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Development of a stable and highly active metal oxide based electrochemical supercapacitor is a major challenge. Herein, we report a Au−Fe 2 O 3 nanocomposite having tiny amount of gold (3 atomic % Au) by employing a simple redox-mediated synthetic methodology using a modified hydrothermal system. Structural and morphological studies of the synthesized Au−Fe 2 O 3 nanocomposite have been performed both experimentally (XRD, IR, Raman, XPS, TEM, and FESEM analyses) and theoretically (WIEN2K). A probable dissolution−nucleation−recrystallization growth mechanism has been suggested to explain the morphological transformation from a Fe 3 O 4 nanoflake to a Au−Fe 2 O 3 nanorod. We have observed the superior chemical stability of the Au−Fe 2 O 3 nanocomposite in an acidic medium due to composite formation. The electrochemical measurement of the synthesized Au−Fe 2 O 3 nanocomposite exhibits specific capacitance of ∼570 F g −1 at the current density of 1 A g −1 in 0.5 M H 2 SO 4 electrolyte. The result is superior compared to the mother component, i.e., Fe 2 O 3 (138 F g −1 ), under identical conditions. It is credited to its higher specific surface area and composite effect. Theoretically, a decrease in band gap associated with increase in conductivity supports the superiority of the Au−Fe 2 O 3 nanocomposite compared to the mother compound, i.e., Fe 2 O 3 . In addition, electrochemical kinetic analysis showed that the charge-storage mechanism is mostly from a dominant capacitive process (78% at 1.5 mV s −1 ). A solid-state asymmetric supercapacitor device has been fabricated using a synthesized Au−Fe 2 O 3 composite nanorod as the positive and activated carbon as the negative electrodes. The asymmetric solid-state device exhibits a maximum energy density of 34.2 Wh kg −1 and power density of 2.73 kW kg −1 at current densities 1 A g −1 and 10 A g −1 , respectively. Thus, the synthesized nanocomposite shows excellent activity as a supercapacitor with long-term durability (91% capacitance retention) up to 5000 cycles even in an acidic medium.

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Section: Resultsmentioning

confidence: 76%

Redox-Mediated Shape Transformation of Fe₃O₄ Nanoflakes to Chemically Stable Au−Fe₂O₃ Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Rudra

Nayak

Koley

et al. 2018

ACS Sustainable Chem. Eng.

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“…In the same HRTEM image (Figure 2d), three separate fringe spacings at 0.23, 0.32, and 0.37 nm were obtained, which indicated respectively the presence of Au, 31 V 2 O 5 , 29 and MnO 2 . 29 Surface area analysis by the BET method indicated a higher specific surface area (65.5 m 2 g −1 ) of the composite compared to commercial V 2 O 5 (11 m 2 g −1 ) (Figure S2a). As per Brunauer classification, the synthesized Au−V 2 O 5 −MnO 2 nanocomposite and pristine V 2 O 5 resemble a type IV isotherm along with the adsorption hysteresis loops indicating the mesoporous structures of the nanomaterials.…”

Section: Electrochemical Studiesmentioning

confidence: 70%

“…29 At high py concentration, the morphological evolution of the VMC is truncated octahedral, whereas at low py concentration, it is octahedral in nature. 29 Because of the presence of more defects and faces, the truncated octahedral VMC is more reactive than the octahedral VMC. The preparation of a Au−V 2 O 5 −MnO 2 nanocomposite with flowerlike morphology is really challenging as well as interesting.…”

Section: Electrochemical Studiesmentioning

confidence: 98%

“…28 To stimulate conductivity of the V 2 O 5 -based electrode material, a conducting metal like Au can be used in the redox reaction with V 2 O 5 . 29 The presence of Au helps to enhance the charge-carrier density on the surface of the V 2 O 5 −MnO 2 -based composite subject to a given potential, which improved the pseudocapacitance performance.…”

Section: Introductionmentioning

confidence: 99%

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Redox-Guided Synthesis of Au–V₂O₅–MnO₂ Nanoflower Composites with Enhanced Electrical Conductance for Supercapacitor Applications

Rudra

Das²,

Maji

et al. 2023

ACS Appl. Nano Mater.

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This paper details an approach for the synthesis of stable electroactive Au–V2O5–MnO2 nanoflower composites using a simple redox-mediated methodology under modified hydrothermal (MHT) conditions. The nanocomposite was characterized by various techniques like X-ray diffraction, scanning electron microscopy, high-resolution transmisson electron microscopy, and X-ray photoelectron spectroscopy. MnO2 and Au formed a profitable hierarchical network morphology in the interstitial sites of V2O5, and this kind of synergetic architecture exhibits an elevated specific capacitance (388 F g–1 at 1 A g–1) compared to commercial V2O5 (85 F g–1 at 1 A g–1) in a neutral electrolyte. The as-synthesized nanocomposite contributed more to energy storage with superior energy density (49 Wh kg–1 at 1 A g–1 current density) and power density (4 kW kg–1 at 10 A g–1 current density) and demonstrated improved stability compared to commercial V2O5 of up to 2000 continuous charge/discharge cycles in a two-electrode system. Temperature- and field-dependent [both direct-current (dc) and alternating-current (ac)] studies exhibited enhanced conductance due to the incorporation of Au and MnO2 and non-Ohmic electrical conduction, characterized by the onset voltage V 0 (dc) and onset frequency f 0 (ac). These two onset parameters followed power-law behavior with Ohmic conductance with two onset exponents (x V and x f). Such electrical transport properties were explained using intrachain hopping conduction of charge carriers within the layers of pristine V2O5 and hopping of charge carriers between the layers of V2O5 in the Au–V2O5–MnO2 nanocomposite and supported the interstitial incorporation of the compounds.

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“…This material displayed a high energy density of 45.9 W h kg –1 at a power density of 700 W kg –1 and a remarkable cyclic ability with over 95% retention of capacitance after 9000 cycles. Furthermore, a sensible active material composition such as Co 3 O 4 –SnO@SnO 2 , Cu x O–V 2 O 5 /CNF, GF-CNT@Fe 2 O 3 , hollow carbon@MoS 2 /MoO 2 nanospheres, Au–V 2 O 5 nanowires, and VO 2 /Fe-PANI nanograins also offers a hopeful avenue for improving SC efficiency.…”

Section: Other Metal Oxides In a Supercapacitormentioning

confidence: 99%

Research Progress on Porous Carbon Supported Metal/Metal Oxide Nanomaterials for Supercapacitor Electrode Applications

Veerakumar

Sangili

Manavalan

et al. 2020

Ind. Eng. Chem. Res.

157

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Recently, transition metal/metal oxides (TMMOs) decorated on porous carbons (PCs) have been intensively focused on designing rational electrode materials for the promising future specific category of electrochemical energy storage and conversion technologies. In particular, TMMO incorporation with PC structures has become very attractive in the area of supercapacitors (SCs) mainly caused by their large accessible surface areas (SSA), together with the suitable pore size distributions (PSD), high electrical conductivity, and rapid redox reactions reversibly on the surface. The transportation of ions, as well as electrons in the bulk of electrodes, is fast as a result of optimal contact between electrodes and electrolytes at the electrode–electrolyte interface, thereby generating high specific capacities (C sp) of these PCs with TMMOs. We report a survey regarding recent advances in the fabrication and synthesis of TMMOs decorated on PCs with some physical characteristics and their applications for electrochemical capacitors. Some future trends and prospects for further development of the subject nanocomposites in application to next-generation supercapacitors are discussed.

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Synthesis of Au-V₂O₅ composite nanowires through the shape transformation of a vanadium(iii) metal complex for high-performance solid-state supercapacitors

Abstract: Au-V2O5 composite nanowires with truncated octahedral morphology are synthesised through the shape transformation of a vanadium(iii) metal complex for use in high-performance solid-state supercapacitors.

Cited by 28 publications

References 36 publications

Redox-Mediated Shape Transformation of Fe₃O₄ Nanoflakes to Chemically Stable Au−Fe₂O₃ Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Redox-Mediated Shape Transformation of Fe₃O₄ Nanoflakes to Chemically Stable Au−Fe₂O₃ Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Redox-Guided Synthesis of Au–V₂O₅–MnO₂ Nanoflower Composites with Enhanced Electrical Conductance for Supercapacitor Applications

Research Progress on Porous Carbon Supported Metal/Metal Oxide Nanomaterials for Supercapacitor Electrode Applications

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Synthesis of Au-V2O5 composite nanowires through the shape transformation of a vanadium(iii) metal complex for high-performance solid-state supercapacitors

Abstract: Au-V2O5 composite nanowires with truncated octahedral morphology are synthesised through the shape transformation of a vanadium(iii) metal complex for use in high-performance solid-state supercapacitors.

Cited by 28 publications

References 36 publications

Redox-Mediated Shape Transformation of Fe3O4 Nanoflakes to Chemically Stable Au−Fe2O3 Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Redox-Mediated Shape Transformation of Fe3O4 Nanoflakes to Chemically Stable Au−Fe2O3 Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Redox-Guided Synthesis of Au–V2O5–MnO2 Nanoflower Composites with Enhanced Electrical Conductance for Supercapacitor Applications

Research Progress on Porous Carbon Supported Metal/Metal Oxide Nanomaterials for Supercapacitor Electrode Applications

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Synthesis of Au-V₂O₅ composite nanowires through the shape transformation of a vanadium(iii) metal complex for high-performance solid-state supercapacitors

Redox-Mediated Shape Transformation of Fe₃O₄ Nanoflakes to Chemically Stable Au−Fe₂O₃ Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Redox-Mediated Shape Transformation of Fe₃O₄ Nanoflakes to Chemically Stable Au−Fe₂O₃ Composite Nanorods for a High-Performance Asymmetric Solid-State Supercapacitor Device

Redox-Guided Synthesis of Au–V₂O₅–MnO₂ Nanoflower Composites with Enhanced Electrical Conductance for Supercapacitor Applications