An asymmetric anthraquinone-modified carbon/ruthenium oxide supercapacitor

Algharaibeh, Zaher; Liu, Xiaorong; Pickup, Peter G.

doi:10.1016/j.jpowsour.2008.11.012

Cited by 151 publications

(91 citation statements)

References 17 publications

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“…The rest (66%) would mainly consist of carbonyls which are not electrochemically active at least in the potential range of the present study, such as a single carbonyl. For example, the redox potential of perinaphthenone, 66 which has only one carbonyl group, is much lower than the redox potential of anthraquinone, 67 which has two carbonyl groups. Cazorla-Amorós et al have systematically investigated the pseudocapacitance behaviors of various activated carbons that were chemically oxidized with HNO 3 .…”

Section: ¹1mentioning

confidence: 99%

Large Pseudocapacitance in Quinone-Functionalized Zeolite-Templated Carbon

Itoi

Nishihara²,

Ishii³

et al. 2013

Bulletin of the Chemical Society of Japan

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Zeolite-templated carbon (ZTC), which can be obtained as a negative replica of a zeolite, consists of buckybowllike nanographenes assembled into a three-dimensional regular network. ZTC is characterized not only by this unique framework structure but also by a very large number of carbon edge sites. In this paper, we report that the edge sites of ZTC are easily functionalized by a large amount of quinone groups through electrochemical oxidation unlike general carbonaceous materials, and the quinone-functionalized ZTC shows a high electrochemical capacitance (ca. 300 500 F g ¹1 ) in an aqueous electrolyte solution (1 M H 2 SO 4 ) as a result of the large pseudocapacitance derived from a quinone/hydroquinone redox couple. Moreover, ZTC keeps its high capacitance even after thousands of charge discharge cycles.Fullerenes, 1 single-walled carbon nanotubes (SWCNTs), 2,3 and graphenes 4,5 are nanocarbon materials with 0D, 1D, and 2D topologies, respectively. Though fullerenes form poorly conductive van der Waals crystals, SWCNTs 6,7 and graphenes 811 are electrically conductive, and are promising as electrode materials for electrochemical capacitors. 12 Their building unit, a graphene sheet, has a large theoretical surface area (2630 m 2 g ¹1 ), and therefore potentially has a large capacitance. However, the actual BrunauerEmmettTeller (BET) surface areas of SWCNTs 13 and graphenes 8 are at most 1250 and 705 m 2 g ¹1 , respectively, because of the aggregation/stacking of the graphene sheets as a result of strong van der Waals interactions. To expose the entire surface, a graphene sheet has to be formed into a self-standing 3D network, like carbon schwarzite 14,15 or pillared graphene, 16 both of which are imaginary materials and have only been proposed theoretically. Thus far our group has demonstrated that it is possible to synthesize a graphene-based architecture with a 3D topology inside the confined-nanospace network of a zeolite crystal, as shown in Figures 1a1c. 1720The zeolite-templated carbon (ZTC) thus obtained consists of a buckybowl-like nanographene assembled into a 3D regular network (Figures 1c and 1d). Both sides of the buckybowllike unit are fully exposed, and, in addition, the narrow nanographene-based framework has a significant number of edge sites. 18 Consequently, ZTC has a very large geometric (theoretical) surface area of 3432 m 2 g ¹1 , and such a large surface area has indeed been observed experimentally.18 ZTC possesses unique spin/magnetic properties 21 and is predicted to have a unique band structure. 22 Moreover, it has a high hydrogen-storage capacity 23,24 and superior performance as an electrode for electrochemical capacitors.2527 Modifications of ZTC with electrochemically active species are expected to further enhance its performance. Graphene-based materials are generally modified by doping of graphene with other functional components such as metal nanoparticles, 2830 metal oxides/ hydroxides, 3134 and conductive polymers. 35 Another modification method is to functionalize graphenes...

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Section: ¹1mentioning

confidence: 99%

Large Pseudocapacitance in Quinone-Functionalized Zeolite-Templated Carbon

Itoi

Nishihara²,

Ishii³

et al. 2013

Bulletin of the Chemical Society of Japan

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“…Where x CH stands for the hydrogen inserted into the nano-textured carbon during charging and oxidized during discharging Transition metal oxides (TMOs), conducting polymers and their corresponding composites materials are promising candidates for ECs applications and are mostly used as positive electrode [11][12][13]. TMOs are widely considered as positive electrode because of their inherent "pseudocapacitance" which is due to rapid and reversible electron exchange reactions at the electrode interface.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric supercapacitor based on nanostructured graphene foam/polyvinyl alcohol/formaldehyde and activated carbon electrodes

Bello

Barzegar

Momodu

et al. 2015

Journal of Power Sources

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We present the electrochemical results of highly porous and interconnected carbon material by activation of graphene foam/polyvinyl alcohol-formaldehyde composite material designated as GF/PVA-F. Asymmetric supercapacitor devices were fabricated using the activated material (GF/PVA-F) and activated carbon (AC) as the positive and negative electrodes respectively. The device exhibited a maximum energy density of 42 mWh cm -2 , a power density of 0.5 W cm -2 and 98% retention of its initial capacitance after 2000 cycles in an extended cell potential window of 1.8 V in 1 M Na 2 SO 4 aqueous electrolyte. This work shows the great potential of this material for high performance energy storage application.

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“…Two different O-protected catechol diazonium salts were synthetized and reacted with microporous Norit-S50 carbon to investigate the impact of the protecting group on the electrochemical performances of supercapacitor electrodes in 1 M H 2 SO 4 . Carbon products were characterized by thermal gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) experiments and nitrogen gas adsorptiondesorption measurements to investigate the film composition, as well as the impact of the grafting on the textural properties of the Norit-S50.…”

Section: Introductionmentioning

confidence: 99%

Improvement of electrochemical performances of catechol-based supercapacitor electrodes by tuning the redox potential via different-sized O-protected catechol diazonium salts

Touzé

Gohier

Daffos

et al. 2018

Electrochimica Acta

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a b s t r a c tTwo different O-protected catechol diazonium salts were synthetized and reacted with microporous Norit-S50 carbon to investigate the impact of the protecting group on the electrochemical performances of supercapacitor electrodes in 1 M H 2 SO 4 . Carbon products were characterized by thermal gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) experiments and nitrogen gas adsorptiondesorption measurements to investigate the film composition, as well as the impact of the grafting on the textural properties of the Norit-S50. Supercapacitor electrodes, prepared from carbon products, were studied by cyclic voltammetry at different scan rates and by galvanostatic charge/discharge experiments after deprotection of catechol-attached groups. It was found that the specific charge was improved by introducing catechol groups under protected forms and that the potential at which the redox reaction occurred depends on the protecting group used. With bulky triisopropylsilyl protecting groups, the formal potential of catechol-attached moieties shifted in the positive direction by about 300 mV, yielding an energy gain significantly increased, compared to the same charge stored in the level of catechol groups introduced with methyl protecting groups. 1100 repetitive charge/discharge curves at 1 A g À1 were achieved to study the stability of supercapacitors electrodes. Results obtained were tentatively explained in terms of the porous structure of the carbon.

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An asymmetric anthraquinone-modified carbon/ruthenium oxide supercapacitor

Cited by 151 publications

References 17 publications

Large Pseudocapacitance in Quinone-Functionalized Zeolite-Templated Carbon

Large Pseudocapacitance in Quinone-Functionalized Zeolite-Templated Carbon

Asymmetric supercapacitor based on nanostructured graphene foam/polyvinyl alcohol/formaldehyde and activated carbon electrodes

Improvement of electrochemical performances of catechol-based supercapacitor electrodes by tuning the redox potential via different-sized O-protected catechol diazonium salts

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