Intercalation pseudocapacitance in Bi2Se3−MnO2 nanotube composite for high electrochemical energy storage

Pradhan, Mukul; Chakraborty, Rishika; Rudra, Siddheswar; Koley, S.; Maji, Pradip K.; Nayak, Arpan Kumar; Das, Sutanu; Nandi, U. N.

doi:10.1016/j.electacta.2020.137531

Cited by 22 publications

(9 citation statements)

References 59 publications

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“…It can be seen that the maximum energy density of ASC is 75.3 Wh kg −1 at 598.9 W kg −1 . Even at the maximum power density of 18 × 10 3 W kg −1 , it still retains an energy density of 26.7 Wh kg −1 , which is far higher than the maximum energy density shown in other supercapacitor systems reported previously in Figure 10, such as 3DG//OV−MnO 2 (56.04 Wh kg −1 ), 60 MoO 3−x // MnO 2 −C (54.2 Wh kg −1 ), 61 MoO x N y /RGO/CNF// MnO x N y /RGO/CNF (49 Wh kg −1 ), 24 AC//N+MnO 2 @ TiC/C (23.9 Wh kg −1 ), 62 Bi 2 Se 3 −MnO 2 //Bi 2 Se 3 −MnO 2 (62 Wh kg −1 ), 63 and FeOOH/C//MnO 2 −70 (55.9 Wh kg −1 ). 64 Furthermore, to demonstrate the practical application of ASC, that can be used to drive an electric fan running as the power source, as shown in Figure 11(b,c).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

Gong

Tong

Xiao

et al. 2022

ACS Appl. Energy Mater.

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Suffering from the sluggish kinetics resulting from the inferior conductivity of manganese dioxide (MnO 2 ), many endeavors have been devoted to promoting the electrochemical performance of MnO 2 . Doping heteroatoms into host materials has emerged as an effective strategy to generate lattice vacancies for fast diffusion of ions/electrons in MnO 2 -based materials for supercapacitors (SCs). To eliminate the use of dangerous solvents and the severe reaction conditions used in previous reports, in this work, we first obtain N-doped MnO 2 (N−MnO 2 ) nanosheets with abundant oxygen vacancies simultaneously by a mild hydrothermal reaction. Thus, thanks to the mutual effect of N doping and oxygen vacancies, the capability of ion diffusion for N−MnO 2 /NGCF (NGCF represents N-doped single-wall carbon nanotube cross-linked graphene composite film) has increased an order of magnitude (1.68 × 10 −11 cm 2 s −1 compared with 8.42 × 10 −13 cm 2 s −1 for MnO 2 /NGCF) and shows superior rate capability, where at 30 A g −1 a capacitance retention of 51.7% remains, i.e., 185.1 F g −1 , compared with 44% at 15 A g −1 for MnO 2 /NGCF. In addition, we apply ex situ X-ray diffraction (XRD) and scanning electron microscopy (SEM) to verify the fact that nitrogen doping with abundant vacancies will benefit reversible intercalation/stripping of Na + by triggering the phase change from MnO 2 to MnOOH for N−MnO 2 compared with MnO 2 with adsorption/desorption during the charge−discharge process, which has never been discussed before. Excitingly, an asymmetric supercapacitor (ASC), fabricated by N−MnO 2 /NGCF as a cathode and MnO 2 /NGCF as an anode, delivers a maximum energy and power density of 75.3 Wh kg −1 and 18.1 × 10 3 W kg −1 , respectively. This work provides an approach to design self-standing advanced N-doped MnO 2 and a deeper insight into the mode of reaction of MnO 2 in neutral electrolyte for aqueous SCs.

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Section: Resultsmentioning

confidence: 99%

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

Gong

Tong

Xiao

et al. 2022

ACS Appl. Energy Mater.

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“…In addition, powder X-ray diffraction (XRD) patterns were obtained to investigate the interlayer spacing of Co 3 (PO 4 ) 2 /I-rGO (Figure a,b). ,,, It can be observed that the pattern shown in Figure a is indexed to JCPDS NO.33–0432, demonstrating a successful preparation and high purity of Co 3 (PO 4 ) 2 /I-rGO. Noteworthily, comparing with rGO (25.9°, 3.44 Å) and I-rGO (23.9°, 3.72 Å) (Figure b), the (002) diffraction peaks of Co 3 (PO 4 ) 2 /I-rGO are shifted to a lower angle of 22.4°, which corresponds to an interlayer spacing of 3.96 Å and is consistent with the TEM results shown in Figure d,e, further demonstrating that Co 3 (PO4) 2 is loaded between the layers of I-rGO.…”

Section: Resultsmentioning

confidence: 99%

Cobalt Phosphates Loaded into Iodine-Spaced Reduced Graphene Oxide Nanolayers for Electrochemical Measurement of Superoxide Generated by Cells

Zou

Chen

Shi

et al. 2021

ACS Appl. Nano Mater.

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Cobalt phosphate (Co3(PO4)2) has been recognized as a biomimetic superoxide anion (O2 •–) sensing material, but there is a great challenge to achieve high sensitivity due to its relatively poor conductivity. Here, a unique nanostructure is synthesized by using iodine nanospacer-impregnated reduced graphene oxide (I-rGO) layers to nest Co3(PO4)2. The role of iodine greatly enhances the density of nanoscale Co3(PO4)2 catalytic centers by separating reduced rGO layers while accelerating the interfacial electron transfer and followed transport through the directionally arranged conductive grapheme layers. The Co3(PO4)2/I-rGO sensor delivers a very good selectivity with a higher sensitivity, shorter response time, and wider linear range than that of Co3(PO4)2/rGO without the iodine nanospacers toward O2 •– detection, and also the reported Co3(PO4)2 nanorods work. Furthermore, the sensor was used to detect O2 •– generated by prostate cancer cells. This study holds promise for a high value nanoscale biomimetic sensor in practical clinical and bioresearch applications and also demonstrates a rational merit-hybrid nanocomposite design by offering critical contributions from individual components into the biomimetic sensing platform.

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“…Its variable oxidation state makes it chemically feasible to form composites with other structures without disrupting the mother structure with increased specific surface area. 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%

“…This material finds renewed interest for energy storage and conversion applications. Its variable oxidation state makes it chemically feasible to form composites with other structures without disrupting the mother structure with increased specific surface area . 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 .…”

Section: Introductionmentioning

confidence: 99%

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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Intercalation pseudocapacitance in Bi2Se3−MnO2 nanotube composite for high electrochemical energy storage

Cited by 22 publications

References 59 publications

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

Cobalt Phosphates Loaded into Iodine-Spaced Reduced Graphene Oxide Nanolayers for Electrochemical Measurement of Superoxide Generated by Cells

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

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Intercalation pseudocapacitance in Bi2Se3−MnO2 nanotube composite for high electrochemical energy storage

Cited by 22 publications

References 59 publications

Enhanced Reaction Kinetics of N–MnO2 Nanosheets with Oxygen Vacancies via Mild NH3·H2O Bath Treatment for Advanced Aqueous Supercapacitors

Enhanced Reaction Kinetics of N–MnO2 Nanosheets with Oxygen Vacancies via Mild NH3·H2O Bath Treatment for Advanced Aqueous Supercapacitors

Cobalt Phosphates Loaded into Iodine-Spaced Reduced Graphene Oxide Nanolayers for Electrochemical Measurement of Superoxide Generated by Cells

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

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Product

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Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

Enhanced Reaction Kinetics of N–MnO₂ Nanosheets with Oxygen Vacancies via Mild NH₃·H₂O Bath Treatment for Advanced Aqueous Supercapacitors

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