Graphene nanoplatelets supported MnO2 nanoparticles for electrochemical supercapacitor

Yu, Aiping; Sy, Abel; Davies, Aaron

doi:10.1016/j.synthmet.2011.04.034

Cited by 48 publications

(24 citation statements)

References 21 publications

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“…For comparison we prepared a chemically reduced graphene using the same graphite precursor oxidized through our previously reported modified Hummers method45464748. To reduce the graphene oxide (GO), a solution of 400 mg GO and 40 mL DDI water were sonicated and then sodium carbonate was added until pH reached 10.…”

Section: Methodsmentioning

confidence: 99%

High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

Chabot

Kim

Sloper

et al. 2013

Sci Rep

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182

124

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Exploiting the emulsification properties of low cost, environmentally safe Gum Arabic we demonstrate a high yield process to produce a few layer graphene with a low defect ratio, maintaining the pristine graphite structure. In addition, we demonstrate the need for and efficacy of an acid hydrolysis treatment to remove the polymer residues to produce 100% pure graphene. The scalable process gives yield of up to 5 wt% graphene based on 10 g starting graphite. The graphene product is compared with reduced graphene oxide produced through Hummer's method using UV-visible spectroscopy, SEM, TEM, and Raman spectroscopy. The two graphene materials show significant difference in these characterizations. Further, the film fabricated from this graphene exhibits 20 times higher electrical conductivity than that of the reduced graphene oxide. Sonication processing of graphite with environmentally approved biopolymers such as Gum Arabic opens up a scalable avenue for production of cheap graphene.

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Section: Methodsmentioning

confidence: 99%

High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

Chabot

Kim

Sloper

et al. 2013

Sci Rep

Self Cite

182

124

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“…However, supercapacitor properties of rGO/h‐BN and transition metal composite have not been evaluated previously. There are several reports on the rGO/transition metal oxide composite supercapacitor electrodes . Charge storage capacity and stability of the metal oxide/rGO composites are superior in comparison to the bare metal oxide electrode due to the presence of EDLC mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…There are several reports on the rGO/transition metal oxide composite supercapacitor electrodes. [20][21][22][23][24][25][26][27][28][29] Charge storage capacity and stability of the metal oxide/rGO composites are superior in comparison to the bare metal oxide electrode due to the presence of EDLC mechanism. Different synthesis techniques like solution mixing, hydrothermal, micro wave and electrochemical synthesis were used to prepare the rGO/transition metal oxide composite.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Chemi‐adsorption, EDLC, and Redox Capacitance Through Electro‐precipitation Synthesis of Fe₃O₄/NiO@rGO/h‐BN for the Development of Hybrid Supercapacitor

et al. 2019

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3D Fe3O4/NiO was grafted on to the 2D rGO/h‐BN by electro‐precipitation method. Nitrogen of h‐BN moiety and oxygen functional groups of rGO played the role of negative active site to trap the metallic cations. Electrochemical charge storage mechanism was optimized by controlling the stoichiometry and defect contents of Fe3O4/NiO@rGO/h‐BN. Stoichiometry of the electro‐precipitated samples was tailored in presence of negative active sites of rGO/h‐BN and applied D.C. bias of the electrochemical bath. In addition, the nucleation and growth of metal oxides were influenced by the stacking and vacancy defects of rGO/h‐BN sheets. High specific capacitance (1328 F g−1) of Fe3O4/NiO@rGO/h‐BN was attributed to the synergistic effect of electrochemical double layer capacitance of rGO, chemi‐adsorption of –OH ions on Lewis acid (boron of h‐BN moiety) and redox capacitance of Fe3O4/NiO in alkaline medium. In addition, the presence of pyrrolic defect at the rGO/h‐BN stacking region acted as the nucleation site and provided additional redox capacitance by shifting the Fermi level towards the valance band. An asymmetric supercapacitor (ASC) was constructed using Fe3O4/NiO@rGO/h‐BN and thermally reduced GO as positive and negative electrode, respectively. ASC showed high energy (82 W h Kg−1) and power density (5600 W Kg−1) along with low relaxation time constant (2.2 ms) and high stability (79%) after 10,000 charge discharge cycles.

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“…16 Recently, Chiam et al 21 have fabricated a supercapacitor, with GNPs-loaded copper foil electrodes, microporous paper separator and aqueous electrolyte, showing energy and power densities of 24.6 WhÁkg À1 and 402 WÁ kg À1 respectively. Yu et al 22 have also developed a supercapacitor, based on GNPs and manganese oxide-loaded carbon electrodes and aqueous electrolyte, yielding a specific capacitance and energy density of 542 FÁ g À1 and 75 WhÁ kg À1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Improving the multifunctionality of structural supercapacitors by interleaving graphene nanoplatelets between carbon fibers and solid polymer electrolyte

Javaid

Zafrullah

Khan

et al. 2018

Journal of Composite Materials

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Novel structural supercapacitors, containing graphene nanoplatelets incorporated carbon fiber mats as electrodes, crosslinked diglycidylether of bisphenol-A epoxy polymer electrolyte and filter paper separator, have been manufactured for the first time by vacuum-assisted resin transfer molding process. These supercapacitors can bear structural loads and store electrochemical energy at the same time. Loading of high surface area graphene nanoplatelets on carbon fiber mats is an effective process to improve the charge storage capacity of the electrodes. Electrochemical and structural properties of the structural supercapacitors are explored through in-plane shear testing, dynamic mechanical thermal analysis, chronoamperometry and impedance spectroscopy, respectively. As graphene nanoplatelet loadings on carbon fiber mat electrodes increase from 0 to 10 wt.%, the structural supercapacitors exhibit significant improvements in specific capacitance (8.9–118.7 mF·cm−3), energy density (19.7–263.8 Wh·m−3) and normalized in-plane shear modulus (1.7–3.1 GPa). Thus, this study has revealed that using the graphene nanoplatelet loaded carbon fiber mats as structural supercapacitor electrodes is a relatively novel and easy approach to enhance the multifunctionality of structural supercapacitors.

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Graphene nanoplatelets supported MnO2 nanoparticles for electrochemical supercapacitor

Cited by 48 publications

References 21 publications

High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

Optimization of Chemi‐adsorption, EDLC, and Redox Capacitance Through Electro‐precipitation Synthesis of Fe₃O₄/NiO@rGO/h‐BN for the Development of Hybrid Supercapacitor

Improving the multifunctionality of structural supercapacitors by interleaving graphene nanoplatelets between carbon fibers and solid polymer electrolyte

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Graphene nanoplatelets supported MnO2 nanoparticles for electrochemical supercapacitor

Cited by 48 publications

References 21 publications

High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

Optimization of Chemi‐adsorption, EDLC, and Redox Capacitance Through Electro‐precipitation Synthesis of Fe3O4/NiO@rGO/h‐BN for the Development of Hybrid Supercapacitor

Improving the multifunctionality of structural supercapacitors by interleaving graphene nanoplatelets between carbon fibers and solid polymer electrolyte

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Optimization of Chemi‐adsorption, EDLC, and Redox Capacitance Through Electro‐precipitation Synthesis of Fe₃O₄/NiO@rGO/h‐BN for the Development of Hybrid Supercapacitor