Intercalation pseudocapacitance in chemically stable Au-α-Fe2O3-Mn3O4 composite nanorod: Towards highly efficient solid-state symmetric supercapacitor device

Rudra, Siddheswar; Chakraborty, Rishika; Maji, Pradip K.; Koley, S.; Nayak, Arpan Kumar; Paul, Debojit; Pradhan, Mukul

doi:10.1016/j.electacta.2019.134865

Cited by 29 publications

(12 citation statements)

References 62 publications

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“…However, there are fewer types of anodes, and the usual reports are porous carbons and ferric oxide. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Ferric oxide usually has poor electrical conductivity and needs to be combined with carbon materials, leading to reduction of its capacitance. Therefore, it is challenging to develop new anode materials with good conductivity and high capacitance.…”

Section: Introductionmentioning

confidence: 99%

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

Wang

Rao²,

et al. 2020

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

Wang

Rao²,

et al. 2020

RSC Adv.

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“…The crystallographic information on the synthesized nanomaterial was obtained from the fringe spacing calculation of a HRTEM image. In the same HRTEM image (Figure d), three separate fringe spacings at 0.23, 0.32, and 0.37 nm were obtained, which indicated respectively the presence of Au, V 2 O 5 , and MnO 2 . 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).…”

Section: Resultsmentioning

confidence: 72%

“…The XRD patterns shown in Figure indicate the existence of Au (111, 200, 220, and 311; JCPDS 04-0784), V 2 O 5 (020, 001, 011, 040, 101, 130, 002, 012, 041, 060, 102, 200, 060, 201, 240, and 170; JCPDS 60-0767) ,, and MnO 2 (200, 310, 211, and 600; JCPDS 44-0141) in the synthesized composite. Figure also shows the XRD patterns with Rietveld refinement analysis using Fullprof software by introducing three phases, V 2 O 5 , Au, and MnO 2 , The refinement result shows that the V 2 O 5 compound retained its orthorhombic structure with space group Pmn 21 and Au maintained its face-centered-cubic structure with space group Fm 3 m .…”

Section: Resultsmentioning

confidence: 98%

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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“…Figure 6(c) shows the linear relation between anodic and cathodic peak current with respect to the square root of scan rate, indicating that the cyclic‐voltammetry curve exhibits a semi‐infinite diffusion‐controlled process in the electrode. Furthermore, the diffusion kinetics of electrodes can be understood by determining the diffusion coefficient [26] . The diffusion coefficient for the electrode was determined using the Randles–Ševčík equation as represented in equation 6. [27–28]

true i_{p} = 2.686 \times 10^{5} \times n^{3 / 2} A D^{1 / 2} C_{o} v^{1 / 2}

…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the diffusion kinetics of electrodes can be understood by determining the diffusion coefficient. [26] The diffusion coefficient for the electrode was determined using the Randles-Ševčík equation as represented in equation 6. [27][28] i p ¼ 2:686…”

Section: Chemistryselectmentioning

confidence: 99%

NiC₂O₄ ⋅ 2H₂O Nanoflakes: A Novel Redox‐mediated Intercalative Pseudocapacitive Electrode for Supercapacitor Applications in Aqueous KOH and Neutral Na₂SO₄ electrolytes

et al. 2022

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Pseudocapacitors with the accessibility of different oxidation states for redox‐mediated charge storage can achieve higher energy density compared to EDLC. NiC2O4 ⋅ 2H2O is envisaged here as a potential pseudocapacitive electrode that works with the accessibility of the Ni2+/3+ redox couple in the flexible structural network due to the presence of planar oxalate anions (C2O42−) supported by the 3‐dimensional hydrogen bonding network of crystal water. The NiC2O4 ⋅ 2H2O electrode showed a superior specific capacitance equivalent to 990 F/g in the potential window of 0 to 0.45 V observed in aqueous KOH electrolyte and 440 F/g in 1 M neutral Na2SO4 electrolyte in the potential window of 0 to 0.85 V. Predominant intercalative mechanism seems to play an important role behind the high charge storage capacity of NiC2O4 ⋅ 2H2O electrode and the interactive contribution was found to be ∼84 % and surface contribution was found to be ∼16 % respectively. Further, in full cell asymmetric supercapacitor (AAS) mode in KOH electrolyte, in which NiC2O4 ⋅ 2H2O is made as the positive electrode and Activated Carbon (AC) is made as the negative electrode, the highest specific energy of 141.5 Wh/kg and specific power of ∼559 W/kg at 0.2 A/g current density was obtained with superior cyclic stability. The detailed electrochemical studies confirm high cyclic stability and stable performance that makes NiC2O4 ⋅ 2H2O a potential pseudocapacitive electrode for large‐scale energy storage applications.

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Intercalation pseudocapacitance in chemically stable Au-α-Fe2O3-Mn3O4 composite nanorod: Towards highly efficient solid-state symmetric supercapacitor device

Cited by 29 publications

References 62 publications

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

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

NiC₂O₄ ⋅ 2H₂O Nanoflakes: A Novel Redox‐mediated Intercalative Pseudocapacitive Electrode for Supercapacitor Applications in Aqueous KOH and Neutral Na₂SO₄ electrolytes

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Intercalation pseudocapacitance in chemically stable Au-α-Fe2O3-Mn3O4 composite nanorod: Towards highly efficient solid-state symmetric supercapacitor device

Cited by 29 publications

References 62 publications

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

Cu-MOF derived Cu–C nanocomposites towards high performance electrochemical supercapacitors

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

NiC2O4 ⋅ 2H2O Nanoflakes: A Novel Redox‐mediated Intercalative Pseudocapacitive Electrode for Supercapacitor Applications in Aqueous KOH and Neutral Na2SO4 electrolytes

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Product

Resources

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

NiC₂O₄ ⋅ 2H₂O Nanoflakes: A Novel Redox‐mediated Intercalative Pseudocapacitive Electrode for Supercapacitor Applications in Aqueous KOH and Neutral Na₂SO₄ electrolytes