Activated carbon nanocomposite electrodes for high performance supercapacitors

Jang, Yunseok; Jo, Jeongdai; Choi, Yun‐Jaie; Kim, In-Young; Lee, Seung–Hyun; Kim, Daewon; Yoon, Seong Man

doi:10.1016/j.electacta.2013.04.020

Cited by 46 publications

(29 citation statements)

References 21 publications

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“…Such functional groups improve hydrophillicity of CNTs leading to enhanced wettability and also facilitate rapid electrolyte ion transfer within the microspores of the CNTs. Pseudocapacitance induced from the surface oxygenated functional groups also contributes to total capacitance and improve performance of SCs [6,52]. The CV profile of FCNT and FZ-1 at different scan rate from 10 to 500 mV/s within the potential window of -0.4 to +0.6 V are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Capacitive behaviour of functionalized carbon nanotube/ZnO composites coated on a glassy carbon electrode

Suroshe

Garje

2015

J. Mater. Chem. A

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An efficient and simple method has been developed to synthesize functionalized multiwall carbon nanotube (FCNTs)/ZnO composites which are employed as supercapacitor (SCs) materials. The multiwall carbon nanotubes (MWCNTs) have been oxidised in presence of concentrated HNO 3 at 120 0 C for 2 h to generate oxygenated functional groups on the tubeends along with side walls of FCNTs to enhance their inherent capacitance. The synthesis of FCNTs/ZnO composites have been carried out by solvothermal decomposition of single source precursor (SSP), ZnCl 2 (benzscz) 2 (benzscz = benzaldehyde semicarbazone). FCNT/ZnO composites are well characterized by different techniques viz. X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) etc. FCNT/ZnO/glassy carbon (GC) electrodes are fabricated by deposition of FCNT/ZnO composites on the surface of GC which are further tested for their electrochemical performances by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronopotentiometry. FCNT/ZnO composite electrodes show better reversible charging/discharging ability and higher capacitance values compared to bareFCNTs and ZnO electrodes due to synergistic effect of FCNTs and ZnO. Results show that the composite FZ-1 (FCNT/ZnO (1:1)) displays higher capacitance (157 F/g), maximum energy density (32.15 Wh/kg) and good cycle stability. It retains over 96% of its initial specific capacitance even after 1000 cycles.

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Section: Resultsmentioning

confidence: 99%

“…The functionalized MWCNTs were thoroughly washed several times with double distilled water until the pH of the filtrate was neutral and dried in an oven at 110 0 C. 6 …”

Section: Functionalization Of Mwcntsmentioning

confidence: 99%

Capacitive behaviour of functionalized carbon nanotube/ZnO composites coated on a glassy carbon electrode

Suroshe

Garje

2015

J. Mater. Chem. A

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“…It should be noted that, unlike many previous publications [28,39,40], the ESR values from the charge/ discharge curves were used, not those from the Nyquist plot which gives much smaller ESR values and consequently a higher power density. From the Nyquist plots scanned from 100 kHz to 10 mHz (Fig.…”

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confidence: 99%

High energy density supercapacitors from lignin derived submicron activated carbon fibers in aqueous electrolytes

Zhang

Pan

et al. 2014

Journal of Power Sources

223

111

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“…In contrast to previous approaches, we used a functionalized activated carbon (FAC) used in our previous work. 16 Because MnO 2 film was made from aqueous solution containing sodium permanganate, functional groups such as hydroxyl and carboxylic group on the FAC 16 enhance the compatibility between FAC and an aqueous permanganate solution and make homogenous MnO 2 layer on the FAC. And a relatively high surface area of FAC maximizes the contact of FAC/ MnO 2 hybrid electrode and the electrolyte solution, which maximizes the redox reaction of MnO 2 on FAC/MnO 2 hybrid electrode.…”

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confidence: 99%

“…As shown in our previous work, 16 polyvinyl phenol (PVP, Aldrich, Inc.) and poly(melamine-co-formaldehyde) (PMF, Aldrich, Inc.) were dissolved in propylene glycol methyl ether acetate (PGMEA, Aldrich, Inc.) as the binder materials of the FAC electrode. FAC electrodes with rectangular patterns covering an area of 2 Â 2 cm 2 were deposited by spray-coating the FAC solution on the SUS304 sheet.…”

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confidence: 99%

Activated carbon/manganese dioxide hybrid electrodes for high performance thin film supercapacitors

Jang

et al. 2014

Applied Physics Letters

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We combine the activated carbon (AC) and the manganese dioxide (MnO2) in a AC/MnO2 hybrid electrode to overcome the low capacitance of activated carbon and MnO2 by exploiting the large surface area of AC and the fast reversible redox reaction of MnO2. An aqueous permanganate (MnO4−) is converted to MnO2 on the surface of the AC electrode by dipping the AC electrode into an aqueous permanganate solution. The AC/MnO2 hybrid electrode is found to display superior specific capacitance of 290 F/g. This shows that supercapacitors classified as electric double layer capacitors and pseudocapacitors can be combined together.

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Activated carbon nanocomposite electrodes for high performance supercapacitors

Cited by 46 publications

References 21 publications

Capacitive behaviour of functionalized carbon nanotube/ZnO composites coated on a glassy carbon electrode

Capacitive behaviour of functionalized carbon nanotube/ZnO composites coated on a glassy carbon electrode

High energy density supercapacitors from lignin derived submicron activated carbon fibers in aqueous electrolytes

Activated carbon/manganese dioxide hybrid electrodes for high performance thin film supercapacitors

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