Graphene materials preparation methods have dramatic influence upon their capacitance

Buglione, Lucia; Chng, Elaine Lay Khim; Ambrosi, Adriano; Sofer, Zdeněk; Pumera, Martin

doi:10.1016/j.elecom.2011.09.013

Cited by 103 publications

(68 citation statements)

References 30 publications

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“…As the electrolyte is KOH it is probable that the first charging processes are needed to build double layers inside the electrodes like in activated porous carbons [19]. These results are similar to those obtained in literature [20] for graphite oxide. Typically higher values are obtained for a three-electrode test cell than for two-electrode system [21], but the latter is more relevant for capacity measurements.…”

Section: Resultssupporting

confidence: 82%

Capacitive behavior of highly-oxidized graphite

Ciszewski

Mianowski

2014

Materials Science-Poland

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Capacitive behavior of a highly-oxidized graphite is presented in this paper. The graphite oxide was synthesized using an oxidizing mixture of potassium chlorate and concentrated fuming nitric acid. As-oxidized graphite was quantitatively and qualitatively analyzed with respect to the oxygen content and the species of oxygen-containing groups. Electrochemical measurements were performed in a two-electrode symmetric cell using KOH electrolyte.It was shown that prolonged oxidation causes an increase in the oxygen content while the interlayer distance remains constant. Specific capacitance increased with oxygen content in the electrode as a result of pseudo-capacitive effects, from 0.47 to 0.54 F/g for a scan rate of 20 mV/s and 0.67 to 1.15 F/g for a scan rate of 5 mV/s. Better cyclability was observed for the electrode with a higher oxygen amount.

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Section: Resultssupporting

confidence: 82%

Capacitive behavior of highly-oxidized graphite

Ciszewski

Mianowski

2014

Materials Science-Poland

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“…Buglione et al have reported that the methods used to reduce GO have a dramatic influence upon the capacitance, and that thermally reduced GO exhibited the highest values [38]. However, thermal reduction is limited in this work because of the low stability of the fabric at high temperature.…”

Section: Properties Of Rgo Coated Stretchable Conductive Fabricmentioning

confidence: 58%

Reduced graphene oxide and polypyrrole/reduced graphene oxide composite coated stretchable fabric electrodes for supercapacitor application

Zhao

Shu

Wang

et al. 2015

Electrochimica Acta

109

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. (2015). Reduced graphene oxide and polypyrrole/reduced graphene oxide composite coated stretchable fabric electrodes for supercapacitor application. Electrochimica Acta, Reduced graphene oxide and polypyrrole/reduced graphene oxide composite coated stretchable fabric electrodes for supercapacitor application AbstractThe advent of self-powered functional garments has given rise to a demand for stretchable energy storage devices that are amendable to integration into textile structures. The electromaterials (anode, cathode and separator) are expected to sustain a deformation of 3% to 55% associated with body movement. Here, we report a stretchable fabric supercapacitor electrode using commonly available nylon lycra fabric as the substrate and graphene oxide (GO) as a dyestuff. It was prepared via a facile dyeing approach followed by a mild chemical reduction. This reduced graphene oxide (rGO) coated fabric electrode retains conductivity at an applied strain of up to 200%. It delivers a specific capacitance of 12.3 F g −1 at a scan rate of 5 mV s −1 in 1.0 M lithium sulfate aqueous solution. The capacitance is significantly increased to 114 F g −1 with the addition of a chemically synthesized polypyrrole (PPy) coating. This PPy-rGO-fabric electrode demonstrates an improved cycling stability and a higher capacitance at 50% strain when compared to the performance observed with no strain.Keywords supercapacitor, electrodes, fabric, stretchable, graphene, coated, application, composite, reduced, polypyrrole, oxide Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsZhao, C., Shu, K., Wang, C., Gambhir, S. & Wallace, G. G. (2015 AbstractThe advent of self-powered functional garments has given rise to a demand for stretchable energy storage devices that are amendable to integration into textile structures. The electromaterials (anode, cathode and separator) are expected to sustain a deformation of 3% to 55% associated with body movement. Here, we report a stretchable fabric supercapacitor electrode using commonly available nylon lycra fabric as the substrate and graphene oxide (GO) as a dyestuff. It was prepared via a PPy-rGO-fabric electrode demonstrates an improved cycling stability and a higher capacitance at 50% strain when compared to the performance observed with no strain.

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“…The higher specific surface area, the higher charge contact interface; however, an increase in capacitance may be also obtained by intercalation of an active species like conducting polymers, metal nanoparticles, and metal oxides. Composite materials containing metal oxide are generally classified as conversion electrodes [1], where capacitance arises from typical charge separation and pseudocapacitance caused by Faradaic reactions [2]. Redox reactions between electrolyte and metal oxide can significantly increase the specific capacitance.…”

Section: Introductionmentioning

confidence: 99%

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

Ciszewski

Mianowski

Szatkowski

et al. 2014

Ionics

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We have reported a new reduced graphene oxidebismuth oxide composite that can be used as a supercapacitor electrode. Bi 2 O 3 was synthesized from bismuth nitrate pentahydrate and oxalic acid as a precipitating agent using a hydrothermal process in an aqueous graphene oxide suspension. Instead of mixing graphene oxide with bismuth oxide, we have developed a bismuth oxalate precipitation between the layers. As prepared, composite of hydrated bismuth oxalate and graphene oxide was converted to bismuth oxide and reduced graphene oxide by thermal decomposition in a muffle stove. The material exhibited the specific capacitance of 94 F/ g at current density 0.2 A/g. Using the cyclic voltammetry, the specific capacitance was as high as 55 F/g at scan rate 5 mV/s over the potential range 0-1 V. The material exhibited longterm cycle stability retaining 90 % specific capacitance after 3,000 cycles. Except Bi 3+ ions present in Bi 2 O 3 , some amount of higher energy Bi 5+ was confirmed.

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Graphene materials preparation methods have dramatic influence upon their capacitance

Cited by 103 publications

References 30 publications

Capacitive behavior of highly-oxidized graphite

Capacitive behavior of highly-oxidized graphite

Reduced graphene oxide and polypyrrole/reduced graphene oxide composite coated stretchable fabric electrodes for supercapacitor application

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

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