Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte

Barzegar, Farshad; Bello, Abdulhakeem; Momodu, Damilola Y.; Madito, M.J.; Dangbegnon, Julien K.; Manyala, Ncholu I.

doi:10.1016/j.jpowsour.2016.01.097

Cited by 85 publications

(45 citation statements)

References 48 publications

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“…Here the characterization was done only for CoAl-LDH and the CoAl-LDH/GF composite since for the AEG sample all these had already been reported in reference 46 . X-ray diffraction (XRD) patterns were collected using an XPERT-PRO diffractometer (PANalytical BV, Netherlands) with theta/2theta geometry, operating with a cobalt tube at 50 kV and 30 mA.…”

Section: Structure and Morphology Characterizationmentioning

confidence: 99%

High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

et al. 2016

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An asymmetric supercapacitor fabricated with CoAl-layered double hydroxide/graphene foam (LDH/GF) composite as the positive electrode and activated carbon derived from expanded graphite (AEG) as negative electrode in aqueous 6 M KOH electrolyte is reported. This CoAl-LDH/GF//AEG cell achieved a specific capacitance of 101.4 F g -1 at a current density of 0.5 A g -1 with a maximum energy density as high as 28 Wh kg -1 and a power density of 1420 W kg -1 . Furthermore, the supercapacitor also exhibited an excellent cycling stability with ∼ 100% capacitance retention after 5000 charging-discharging cycles at a current density of 2 Ag -1 . The results obtained show the potential use of the CoAl-LDH/GF//AEG material as suitable electrode for enhanced energy storage as supercapacitor.

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Section: Structure and Morphology Characterizationmentioning

confidence: 99%

High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

et al. 2016

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“…All of curves could maintain approximate rectangles for EDLC characteristic, evidencing the fast charge transport rates within the electrode material. [25] With the increasement of scan rate, the corresponding rectangle area was increased and there was some deformation of CV shape under high scan rate.…”

Section: Electrochemical Performancesmentioning

confidence: 98%

Preparation of Hierarchical Porous Carbon from Wheat Bran for Free‐Standing Electrode of High Areal Capacitance Supercapacitor

et al. 2019

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It is impressive that biomass gives out another option for carbon electrode fabrication in supercapacitors which has low cost and sustainable source. In this work, waste of wheat bran was used to synthesize porous carbon via alkali activation. Under mass ratio of NaOH/precursor as 4, the wheat bran carbon presented hierarchical hexagon pores with prominent surface area of 2562 m 2 g À 1 . Utilizing two symmetrical freestanding electrodes, the as-prepared carbon exhibited gravi-metric capacitance of 294.3 F g À 1 at 0.5 A g À 1 and cyclic life of 94 % for 50,000 cycles at 2 A g À 1 , while commercial carbon showed 269.7 F g À 1 and 75 % stability under the same condition. With large mass loading of 20 mg cm À 2 , the wheat bran carbon revealed superior areal capacitance of 3.08 F cm À 2 , and the value could still maintain as 2.80 F cm À 2 over 10,000 cycles. Consequently, the wheat bran has been found as a promising precursor for advanced carbon electrode.

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“…Tuning the structure of graphite unlocks the potential in DIBs owing to its loose and porous graphitic structure. The modified graphite can be also called expanded graphite (EG) because the loose layered structure may colonize the space for accommodating anions, thus delivering a higher stability than nature graphite during the charge/discharge process . In addition, EG has many virtues such as material abundance and non‐toxicity .…”

Section: Introductionmentioning

confidence: 99%

Carbon‐Based Dual‐Ion Battery with Enhanced Capacity and Cycling Stability

Shi

Deng

et al. 2018

ChemElectroChem

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A high cycling stability of dual‐ion batteries is greatly challenging, as the size required for inserting anions matches only insufficiently with the interlayer spacing of graphite which is often used as positive electrode. Herein, an activated expanded graphite (AEG) electrode is successfully prepared via KOH treatment. The loose structure of AEG accommodates the volume expansion caused by anion intercalation, and the large specific surface area facilitates the immersion of electrolyte ions to afford more energy density. Thus, the cycling stability is largely enhanced without losing capacity. Matching with activated carbon as negative electrode and an ionic liquid electrolyte, the assembled dual‐ion battery achieves an energy density of 43 Wh kg−1 at the power density of 756 W kg−1 within a working window of 0–3.6 V. Specifically, the energy density retains 83 % after 50 cycles. Such effective and low‐cost electrode optimization opens up a new route toward full enhancement on the cycling performance of positive electrodes for dual‐ion batteries.

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Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte

Cited by 85 publications

References 48 publications

High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

Preparation of Hierarchical Porous Carbon from Wheat Bran for Free‐Standing Electrode of High Areal Capacitance Supercapacitor

Carbon‐Based Dual‐Ion Battery with Enhanced Capacity and Cycling Stability

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