Nanostructured activated carbons from natural precursors for electrical double layer capacitors

Wei, Lu; Yushin, Gleb

doi:10.1016/j.nanoen.2012.05.002

Cited by 488 publications

(292 citation statements)

References 109 publications

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“…1,43,44 Among microporous carbons, advanced activated carbons (AC) 1,[44][45][46][47][48][49][50] and carbide derived carbons (CDC) 8,[51][52][53][54][55][56][57] have been investigated the most. At the same time, microporous zeolite templatedcarbons (ZTCs) pioneered by Kyotani et al received significantly smaller attention.…”

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confidence: 99%

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Moon

Kim

Lee

et al. 2015

J. Electrochem. Soc.

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Enhancement of the specific capacitance in electrochemical double layer capacitors (EDLCs) is of high interest due to the ever increasing demand for high power density energy storage devices. Zeolite templated carbon (ZTC) is a promising EDLC electrode material with large specific surface area and straight, ordered well-defined micropores. In this study, ZTC samples were synthesized using a low pressure chemical vapor deposition (LP CVD) of carbon on sacrificial zeolite Y powder using acetylene gas as a precursor. We demonstrate for the first time how various post-treatments of the produced samples can affect the ZTC microstructure and porosity and how such modifications may significantly improve electrochemical performance characteristics of the ZTC-based EDLC electrodes. The effects of CO 2 activation, ball milling and high temperature annealing process were systematically studied. The best performing samples achieved very large capacitance of over 240 Fg −1 at 1 mVs −1 in 1 M solution of tetraethylammonium tetrafluoroborate in acetonitrile and stable performance in symmetric EDLC devices with no noticeable degradation for over 20,000 cycles at a very high current density of 20 Ag Electrochemical double layer capacitors (EDLCs), also called supercapacitors and ultra-capacitors, have attracted extensive attention as EDLCs can provide high power delivery or update, high cycle efficiency, thermal stability, practically unlimited cycle life and relatively low cost of manufacturing.1 Furthermore, a wide operational temperature range and a relatively easy determination of the state of charge can be considered as additional advantageous aspects.1 Hence, there is an increasing growth in demand for EDLCs in industrial equipments, electronic devices, transportation market, and automotive applications.1-5 Yet, significantly smaller energy density (ca. 5 Wh kg −1 ) compared to the state of art rechargeable Li ion batteries (ca. 180 Wh kg −1 ) urgently calls for improvement in capacitance of EDLCs. 6,7 In addition, for some applications it is crucial to further increase the charge-discharge rate capability without deteriorating energy density characteristics. 1The value of the double layer capacitance formed at the electrode/ electrolyte interface (which directly impacts the energy density of EDLCs) is believed to depend on multiple factors, such as specific surface area (SSA) of the electrically conductive porous carbon electrodes, 1,8-11 pore size distribution (PSD) of the carbon electrodes (which may affect both the pore access by electrolyte ions and the solvation shell distortion and the resulting pore wall -ion separation distance), 1,3,9,12 electron density of states in carbon (which may affect the capacitance of the electrode side of the double layer), 13 electrolyte-carbon interfacial energy (which may affect electrolyte wetting in both large and sub-nm sized pores), 14,15 electrolyte-carbon interactions (which may impact electron density of states in carbon), 16 the presence of doping species within carbon (which...

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confidence: 99%

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Moon

Kim

Lee

et al. 2015

J. Electrochem. Soc.

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“…En la literatura especializada esta adherencia se ha explicado por medio del modelo de Gouy-ChapmanStern para una doble capa, de acuerdo al efecto de atracción electrostática por inducción del tipo Helmholtz (Wei & Yushin, 2012).…”

Section: Resultados Y Discusiónunclassified

Fabricación y caracterización de carbón activado y de nanoplaquetas de carbón a partir de Guadua angustifolia Kunth para aplicaciones en electrónica

Prías‐Barragán

Echeverry-Montoya

Calderón

2015

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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Se fabricaron y caracterizaron muestras de carbón activado y nanoplaquetas de carbón obtenidas de Guadua angustifolia Kunth empleada como precursor para aplicaciones en electrónica flexible. El carbón activado se obtuvo en un sistema de pirólisis bajo atmósfera controlada de nitrógeno a una temperatura de 573 K durante una hora y las nanoplaquetas, a una temperatura de 973 K durante una hora. El carbón se activó empleando hidróxido de sodio e hidróxido de potasio con una temperatura de activación de 973 K. Las nanoplaquetas se obtuvieron mediante procesos de molienda mecánica en mortero y procesos de cavitación durante seis horas. Las muestras de carbón activado se caracterizaron mediante isotermas de adsorción y se encontró un área superficial de 408,0 m²/g y 308,9 m²/g para el carbón activado con hidróxido de sodio e hidróxido de potasio, respectivamente. Se utilizó la difracción de rayos X para determinar la presencia de electrólitos remanentes del proceso de activación. Las imágenes obtenidas con el microscopio electrónico de barrido revelaron la estructura porosa del carbón y la presencia de las sales electrolíticas remanentes. Mediante voltametría cíclica se determinó una capacitancia específica máxima de 111 F/g. El carbón activado se empleó en la fabricación de un supercondensador flexible y se logró una capacitancia de 7,9 mF. Las nanoplaquetas se caracterizaron mediante las técnicas de difracción de rayos X, microscopía electrónica de barrido, espectrometría infrarroja con transformada de Fourier y microscopía electrónica de transmisión, con las que se corroboró la presencia de nanoplaquetas de grafito oxidado con espesores inferiores a 13 nm; las curvas de intensidad-voltaje evidenciaron un comportamiento no lineal, atribuido a efectos de percolación de los portadores de carga eléctrica. Estos resultados sugieren que el carbón activado y las nanoplaquetas de carbón son excelentes candidatos para aplicaciones electrónicas.

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“…Uptake wavelength addressed in Fig. 5 obtained absorption wavelengths of specific compounds of MnO 2 can be observed in the area around 922 cm -1 , in addition to the vibrations of the compound Mn-O can also be observed in the area of 829 and 520 cm -1 [9]. Then analyzed respectively in Fig.…”

Section: Methodsmentioning

confidence: 96%

Characterization of CNT-MnO2 nanocomposite by electrophoretic deposition as potential electrode for supercapacitor

Darari

Ardiansah²,

Arifin³

et al. 2016

AIP Conference Proceedings

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Nanostructured activated carbons from natural precursors for electrical double layer capacitors

Cited by 488 publications

References 109 publications

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Increasing Capacitance of Zeolite-Templated Carbons in Electric Double Layer Capacitors

Fabricación y caracterización de carbón activado y de nanoplaquetas de carbón a partir de Guadua angustifolia Kunth para aplicaciones en electrónica

Characterization of CNT-MnO2 nanocomposite by electrophoretic deposition as potential electrode for supercapacitor

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