Kilohertz ultrafast electrochemical supercapacitors based on perpendicularly-oriented graphene grown inside of nickel foam

Ren, Guofeng; Pan, Xuan; Bayne, Stephen; Fan, Zhaoyang

doi:10.1016/j.carbon.2014.01.017

Cited by 148 publications

(156 citation statements)

References 40 publications

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“…This promoted the intercalation of electrolyte ions in the space created by the swelling, or the creation of more pores after many CD cycles leading to a more accessible surface area and hence an increase in efficiency [32].…”

Section: Electrochemical Testingmentioning

confidence: 99%

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Barzegar

Bello

Fashedemi

et al. 2015

Electrochimica Acta

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A scalable production of high surface area nanoporous carbon material (~ 2994 m 2 g -1 ) with good distribution of micro-, meso-and macro-pores was hydrothermally synthesized using both cheap polymers and graphene foam as carbon sources. The as synthesised material shows a unique interconnected porous graphitic structure. The electrochemical double-layer capacitor fabricated from this nanoporous carbon material exhibited a superior supercapacitive performance of 188 F g -1 at current density 0.5 A g -1 . This corresponded to areal capacitance of 6.3 µF cm -2 coupled with a high energy of 0.56 µWh cm -2 (16.71 Wh kg -1 ) and a power density of 13.39 µW cm -2 (401 W kg -1 ) due to extended potential window of 1.6 V in KOH aqueous electrolyte. Moreover, no capacitance loss after 10,000 cycles was observed, owing to the 2 unique structure and large surface area of the active material. The outstanding performance of this material as supercapacitor electrode shows that it has great potential for high performance energy-related applications.

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Section: Electrochemical Testingmentioning

confidence: 99%

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Barzegar

Bello

Fashedemi

et al. 2015

Electrochimica Acta

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“…Due to the intrinsic low speeds of pseudocapacitive ECs, efforts are mainly focused on EDLC-based mechanism. [ 5,6 ] The low rate in pseudocapacitive ECs is caused by the slow charge-transfer processes with surface atoms, and especially the slower insertion/extraction process of cations in the subsurface of oxides. The typically very high resistivity of TMOs, e.g., MnO 2 (ρ ≈10 5 -10 6 Ω cm) and V 2 O 5 (ρ ≈10 3 -10 5 Ω cm) is also blamed, since redox reactions require the presence of both ions and electrons near the active site.…”

Section: Introductionmentioning

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

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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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“…al. 20 which exhibit a capacitance of 0.83 mF cm -2 at a scan rate of 1 Vs -1 for a single electrode as well as with the carbon nanofiber supercapacitors with porous nickel foam obtained via CVD reported by McDonough et. al.…”

Section: Electrochemical Characterizationmentioning

confidence: 62%

“…9,19 The performance was ascribed to the hierarchical pore structure and interconnected mesopores with high surface area Furthermore, as stated earlier, significant efforts have been devoted to producing fast EDLCs for AC-line filtering. Miller et al 21 reported EDLCs electrodes made from vertically oriented nanosheets on heated nickel substrate by radio frequency (RF) plasma enhanced chemical vapor deposition with an exceptional time constant of 200 microseconds, and more recently Ren et al 20 reported perpendicularly-oriented graphene grown on nickel foam with a cell areal capacitance of 0.32 mF cm -2 . In spite of these efforts in the development of these electrodes, rather slow progress has been demonstrated towards the commercialization of EDLCs.…”

Section: Introductionmentioning

confidence: 99%

Morphological characterization and impedance spectroscopy study of porous 3D carbons based on graphene foam-PVA/phenol-formaldehyde resin composite as an electrode material for supercapacitors

et al. 2014

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The design and fabrication of porous electrode materials is highly desirable for improving the performance of electrochemical supercapacitors (ECs) and thus, it is important to produce such porous materials in large quantities. In this study, we used a microwave method to produce porous carbonaceous materials designated as graphene foam/polyvinyl alcohol/formaldehyde (GF/ PVA/F) and graphene foam-polyvinyl alcohol/phenol-formaldehyde (GF/PVA/PF) from graphene foam, phenol formaldehyde and polyvinyl alcohol (PVA). Scanning electron microscopy (SEM), Raman spectroscopy and Fourier-Transform Infrared Spectroscopy (FTIR) were used to characterize the surface morphology, structural defects and functional groups of the materials respectively. Based on these porous materials, the two symmetrical ECs fabricated exhibited a specific capacitance in the range of 0.62-1.92 F cm -2 , phase angles of -81° and -84° and resistor-capacitor (RC) relaxation time constants of 4 and 14 seconds. The physicochemical properties of the electrolyte ion (diffusion) and its influence on the capacitive behavior of the porous materials were elucidated. These encouraging results demonstrate the versatile potential of these porous materials (GF/PVA/F and GF/PVA/PF) in developing high energy storage devices.

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Kilohertz ultrafast electrochemical supercapacitors based on perpendicularly-oriented graphene grown inside of nickel foam

Cited by 148 publications

References 40 publications

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

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

Morphological characterization and impedance spectroscopy study of porous 3D carbons based on graphene foam-PVA/phenol-formaldehyde resin composite as an electrode material for supercapacitors

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Kilohertz ultrafast electrochemical supercapacitors based on perpendicularly-oriented graphene grown inside of nickel foam

Cited by 148 publications

References 40 publications

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

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

Morphological characterization and impedance spectroscopy study of porous 3D carbons based on graphene foam-PVA/phenol-formaldehyde resin composite as an electrode material for supercapacitors

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