High Pseudocapacitance from Ultrathin V<sub>2</sub>O<sub>5</sub>Films Electrodeposited on Self‐Standing Carbon‐Nanofiber Paper

Ghosh, Arunabha; Ju, Eun Jin; Jin, Meihua; Jeong, Hae Kyung; Kim, Tae Hyung; Biswas, Chandan; Lee, Young Hee

doi:10.1002/adfm.201002603

Cited by 210 publications

(142 citation statements)

References 60 publications

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“…Using electrodeposition, Ghosh et al [ 27 ] reported an ultrathin V 2 O 5 layer (3 nm) coated cabon nanofi ber electrode with a very low mass loading of 15 wt% that exhibited a capacitance of 214 F g −1 per mass of the electrode, equivalent to 1308 F g −1 per mass of V 2 O 5 , when measured at 5 mV s −1 scan rate, and an energy density of 45 Wh kg −1 at a power density of 156 W kg −1 of oxide was obtained. Using atomic layer deposition with 10 nm VO x coating on carbon nanotubes, Boukhalfa et al [ 28 ] reported remarkable capacitance of ≈1550 F g −1 of VO x and ≈600 F g −1 per mass of the composite electrode at the current density of 1 A g −1 .…”

Section: +mentioning

confidence: 99%

Fast Supercapacitors Based on Graphene‐Bridged V₂O₃/VO_x Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg⁻¹

Pan

Ren

Hoque

et al. 2014

Adv Materials Inter

109

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Transition metal oxides (TMOs), with their very large pseudocapacitance effect, hold promise for next generation high‐energy‐density electrochemical supercapacitors (ECs). However, the typical high resistivity of TMOs restricts the reported ECs to work at a low charge–discharge (C–D) rate of 0.1–1 V s−1. Here, a novel vanadium oxides core/shell nanostructure‐based electrode to overcome the resistivity challenge of TMOs for rapid pseudocapacitive EC design is reported. Quasi‐metallic V2O3 nanocores are dispersed on graphene sheets for electrical connection of the whole structure, while a naturally formed amorphous VO2 and V2O5 (called as VOx here) thin shell around V2O3 nanocore acts as the active pseudocapacitive material. With such a graphene‐bridged V2O3/VOx core–shell composite as electrode material, ECs with a C–D rate as high as 50 V s−1 is demonstrated. This high rate was attributed to the largely enhanced conductivity of this unique structure and a possibly facile redox mechanism. Such an EC can provide 1000 kW kg−1 power density at an energy density of 10 Wh kg−1. At the critical 45° phase angle, these ECs have a measured frequency of 114 Hz. All these indicate the graphene‐bridged V2O3/VOx core–shell structure is promising for fast EC development.

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Section: +mentioning

confidence: 99%

Fast Supercapacitors Based on Graphene‐Bridged V₂O₃/VO_x Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg⁻¹

Pan

Ren

Hoque

et al. 2014

Adv Materials Inter

109

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“…Transition metal oxides such as MnO 2 , NiO, Fe 2 O 3 and Co 3 O 4 are being studied as candidate materials for pseudocapacitor electrodes [11][12][13][14][15][16][17][18]. Although metal oxides alone offer high specific capacitance, they deliver low power density and poor rate capability (dramatic drop of specific capacitance with an increase at a high scan rate) due to poor electronic conductivity [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A reduced graphene oxide/Co3O4 composite for supercapacitor electrode

Xiang

Zhi

et al. 2013

Journal of Power Sources

510

240

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20 nm sized Co 3 O 4 nanoparticles are in-situ grown on the chemically reduced graphene oxide (rGO) sheets to form a rGO-Co 3 O 4 composite during hydrothermal processing. The rGO-Co 3 O 4 composite is employed as the pseudocapacitor electrode in the 2 M KOH aqueous electrolyte solution. The rGOCo 3 O 4 composite electrode exhibits a specific capacitance of 472 F/g at a scan rate of 2 mV/s in a twoelectrode cell. 82.6% of capacitance is retained when the scan rate increases to 100 mV/s. The rGOCo 3 O 4 composite electrode shows high rate capability and excellent long-term stability. It also exhibits high energy density at relatively high power density. The energy density reaches 39.0 Wh/kg at a power density of 8.3 kW/kg. The super performance of the composite electrode is attributed to the synergistic effects of small size and good redox activity of the Co 3 O 4 particles combined with high electronic conductivity of the rGO sheets.

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“…To the best of our knowledge, the excellent electrochemical behaviors of 3D V 2 O 5 architecture for energy storage are the best for all of the reported V 2 O 5 -based materials, 1,14,16,17,34 holding a great promising application for supercapacitors.…”

Section: −20mentioning

confidence: 99%

“…Strikingly, the 3D V 2 O 5 architectures possess a high energy density of 247.9 W·h·kg ), as well five times higher than those reported for V 2 O 5 -based materials and commercial supercapacitor devices (see Figure S7 in the Supporting Information). 1,14,16,17,33 Moreover, this 3D V 2 O 5 architecture exhibits excellent cycle performance. As shown in Figure S9, the capacitance retention is ∼90% after 4000 cycles at a constant current density of 5 A· g −1…”

Section: −20mentioning

confidence: 99%

Building 3D Structures of Vanadium Pentoxide Nanosheets and Application as Electrodes in Supercapacitors

et al. 2013

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Various two-dimensional (2D) materials have recently attracted great attention owing to their unique properties and wide application potential in electronics, catalysis, energy storage, and conversion. However, largescale production of ultrathin sheets and functional nanosheets remains a scientific and engineering challenge. Here we demonstrate an efficient approach for large-scale production of V 2 O 5 nanosheets having a thickness of 4 nm and utilization as building blocks for constructing 3D architectures via a freezedrying process. The resulting highly flexible V 2 O 5 structures possess a surface area of 133 m 2 g −1, ultrathin walls, and multilevel pores. Such unique features are favorable for providing easy access of the electrolyte to the structure when they are used as a supercapacitor electrode, and they also provide a large electroactive surface that advantageous in energy storage applications. As a consequence, a high specific capacitance of 451 F g −1 is achieved in a neutral aqueous Na 2 SO 4 electrolyte as the 3D architectures are utilized for energy storage. Remarkably, the capacitance retention after 4000 cycles is more than 90%, and the energy density is up to 107 W·h·kg −1 at a high power density of 9.4 kW kg −1 . KEYWORDS: 2D layers, V 2 O 5 , 3D architectures, high energy density, supercapacitor S upercapacitors, also called electrochemical capacitors or ultracapacitors, are extensively studied as they complement lithium-ion batteries due to their high power density, fast delivery rate, and long lifespan. However, the low energy density of supercapacitors largely obstructs the way of their applications as standalone devices. The energy density (E) of a supercapacitor is determined by its specific capacitance (C) and the cell voltage (V) according to the equation of E = 1/2CV 2 . 1,2Thus, improving the specific capacitance of electrode materials is an efficient way to achieve supercapacitors with a high energy density. Generally, high-capacitance electrode materials possess a high surface area and good electrical conductivity since these properties are strongly related to the electrochemical double layer capacitance or electroactive surface for redox-reactions, resulting in pseudocapacitance within an electrode. To date, a large number of high-surface-area carbonaceous materials such as activated carbon, carbon nanotubes, and graphene have been employed as electrode materials for supercapacitors.3−7 In particular, it was shown that graphene, a 2D monolayer of carbon atoms, is an excellent building block for constructing 3D architectures having improved electrochemical performance advantageous for energy storage devices. 6,8 However, these carbon-based electrochemical double-layer capacitors have a low capacitance, especially at high charge/ discharge rates. Metal oxides and hydroxides overcome these limitations of carbon and commonly exhibit high capacitance for energy storage owing to their more efficient energy storage mechanism, and they have potential to be the electrode materia...

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High Pseudocapacitance from Ultrathin V₂O₅Films Electrodeposited on Self‐Standing Carbon‐Nanofiber Paper

Cited by 210 publications

References 60 publications

Fast Supercapacitors Based on Graphene‐Bridged V₂O₃/VO_x Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg⁻¹

Fast Supercapacitors Based on Graphene‐Bridged V₂O₃/VO_x Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg⁻¹

A reduced graphene oxide/Co3O4 composite for supercapacitor electrode

Building 3D Structures of Vanadium Pentoxide Nanosheets and Application as Electrodes in Supercapacitors

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High Pseudocapacitance from Ultrathin V2O5Films Electrodeposited on Self‐Standing Carbon‐Nanofiber Paper

Cited by 210 publications

References 60 publications

Fast Supercapacitors Based on Graphene‐Bridged V2O3/VOx Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg−1

Fast Supercapacitors Based on Graphene‐Bridged V2O3/VOx Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg−1

A reduced graphene oxide/Co3O4 composite for supercapacitor electrode

Building 3D Structures of Vanadium Pentoxide Nanosheets and Application as Electrodes in Supercapacitors

Contact Info

Product

Resources

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High Pseudocapacitance from Ultrathin V₂O₅Films Electrodeposited on Self‐Standing Carbon‐Nanofiber Paper

Fast Supercapacitors Based on Graphene‐Bridged V₂O₃/VO_x Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg⁻¹

Fast Supercapacitors Based on Graphene‐Bridged V₂O₃/VO_x Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg⁻¹