Supercapacitors specialities - Materials review

Obreja, V.V.N.

doi:10.1063/1.4878482

Cited by 34 publications

(14 citation statements)

References 102 publications

(113 reference statements)

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“…[36,37] Moreover, the AC-based electrodes are typically produced by depositing an AC-based paste (prepared by mixing ACs with conductivity enhancers and binders in the form of slurry) on a metallic substrate, acting as current collector. [38] By adopting this method, the deposition of active material can reach mass loadings up to~10 mg cm À 2 . However, higher active material mass loadings result in brittle films, which undermine the mechanical integrity of the final EDLCs as well as light device packaging with flexible polymeric components.…”

Section: Introductionmentioning

confidence: 99%

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

et al. 2019

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The fabrication of electrochemical double‐layer capacitors (EDLCs) with high areal capacitance relies on the use of elevated mass loadings of highly porous active materials. Herein, we demonstrate a high‐throughput manufacturing of graphene/carbon nanotubes hybrid EDLCs. The wet‐jet milling (WJM) method is exploited to exfoliate the graphite into single‐few‐layer graphene flakes (WJM‐G) in industrial volumes (production rate ca. 0.5 kg/day). Commercial single‐/double‐walled carbon nanotubes (SDWCNTs) are mixed with graphene flakes in order to act as spacers between the flakes during their film formation. The WJM‐G/SDWCNTs films are obtained by one‐step vacuum filtration of the material dispersions, resulting in self‐standing, metal‐ and binder‐free flexible EDLC electrodes with high active material mass loadings up to around 30 mg cm−2. The corresponding symmetric WJM‐G/SDWCNTs EDLCs exhibit electrode energy densities of 539 μWh cm−2 at 1.3 mW cm−2 and operating power densities up to 532 mW cm−2 (outperforming most of the reported EDLC technologies). The EDCLs show excellent cycling stability and outstanding flexibility even in highly folded states (up to 180°).

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Section: Introductionmentioning

confidence: 99%

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

et al. 2019

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“…The reduced graphene oxide (RGO) is inferior to graphene in its electrical and thermal properties, but in spite of that it attracts interest of many researchers. This interest is due to capabilities of use of RGO as transparent electrodes, photodetectors, elements of power sources and others [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Study of Electrical Conductivity of Thermally Reduced Graphene Oxide

Neustroev¹,

Nogovitsyna²,

Solovyova³

et al. 2015

RENSIT

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“…The value can be compared with other types of AC used in EDLC that specific capacitance of 75-300 F/g in aqueous electrolytes and 40-120 F/g in organic electrolytes [2,4,9,12]. The symmetric EDLC with AC material (90:10) in two electrodes also represents the characteristic of surface charge distribution in the potential 0-1 V (Figure 4a).…”

Section: Resultsmentioning

confidence: 99%

“…The valuable parameters of AC for use in EDLC are specific surface area (SSA) and pore size distribution determining the specific capacitance [2,9,11]. The chemical composition of AC includes about 90 wt% of carbon amount and some of impurities or moisture with low content (Table 1).…”

Section: Resultsmentioning

confidence: 99%

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Tra Bac Activated Carbon Used as Electrode Material in Aqueous Supercapacitor

Tran¹

2018

JST

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Carbon materials i.e. activated carbon, carbon aerogel, carbon nanotubes (CNTs)… store a high electric power and a great stable cyclability when they are used as electrode materials in electrical double-layers capacitor (EDLC). In this work, activated carbon from coconut shells which was cooperatively provided by the Tra Bac Joint Stock Corporation-TRABACO was investigated as electrode materials in EDLC. Raw carbon material with large particle size was crushed and sieved to obtain a 43 µm grain size fraction for electrochemical characterization. The symmetric EDLC configuration based on Tra Bac carbon was tested in Swagelok-type cell using KOH electrolyte in the potential range 0-1 V. The CV curves indicated that charges can be stored enormously with a high reversibility and stability. The high performance of EDLC based carbon in KOH electrolyte could be further improved by variation of electrode composition. The rate capability of the material was also studied under different current ranges. In our best results, a specific capacitance of 20 F/g was obtained at the charge-discharge current of 1 A/g. Even at very high applied current range, the capacitance dropped slowly, less than fifteen percent.

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Supercapacitors specialities - Materials review

Cited by 34 publications

References 102 publications

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

Study of Electrical Conductivity of Thermally Reduced Graphene Oxide

Tra Bac Activated Carbon Used as Electrode Material in Aqueous Supercapacitor

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