Capacitive behavior of graphene–ZnO composite film for supercapacitors

Zhang, Yanping; Li, Haibo; Pan, Likun; Lü, Ting; Sun, Zhenrong

doi:10.1016/j.jelechem.2009.07.010

Cited by 329 publications

(113 citation statements)

References 28 publications

(33 reference statements)

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“…All the CV loops clearly display a pair of redox peaks, suggesting that RGO/Cu 2 O/Cu composites have excellent capacitance [58,59], which was contributed by double layer capacitors and pseudo capacitors in their structure.…”

Section: Resultsmentioning

confidence: 97%

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Dong

Wang

Zhao

et al. 2014

Journal of Alloys and Compounds

111

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Reduced graphene oxide/cuprous oxide (RGO/Cu2O) composite films were directly synthesized on the surface of copper foil substrates through a straight redox reaction between GO and Cu foil via a hydrothermal approach. Characterization of the resultant composites with X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and field emission scanning electron microscope (FESEM) confirms the formation of Cu2O and reduction of GO, in which Cu2O nanoparticles were well covered by RGO. The resultant composites (referred to as RGO/Cu2O/Cu) were directly used as electrodes for supercapacitors, and their electrochemical performance was assessed by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectrometry (EIS) in 1 M KOH aqueous solution. A specific capacitance of 98.5 F g−1 at 1 A g−1 was obtained, which is much higher than that of pure Cu2O prepared under the same conditions, due to the presence of RGO. Keywordssupercapacitors, synthesis, rgo, cu2o, composite, films, cu, foil, direct Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsDong, X., Wang, K., Zhao, C., Qian, X., Chen, S., Li, Z., Liu, H. & Dou, S. (2014) at 1 A g -1 was obtained, which is much higher than that of pure Cu 2 O prepared under the same conditions, due to the presence of RGO.

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Section: Resultsmentioning

confidence: 97%

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Dong

Wang

Zhao

et al. 2014

Journal of Alloys and Compounds

111

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“…Recently, GR-supported composites have attracted a great deal of attention for their enhanced material properties such as their electrical conductivity and chemical and electrical properties. Many works have been reported on the preparation of GR-based composites (Stankovich et al 2006;Li and Kaner 2008;Si and Samulski 2008;Xu et al 2008;Kou et al 2009;Li et al 2009;Williams and Kamat 2009;Yoo, Okata et al 2009;Zhang et al 2009). Previous studies were mostly conducted to synthesize the composites using various liquid-phase chemical methods such as chemical reduction with hydrazine, the impregnation-reduction method, the colloidal method, and the polyol method.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Pt-Nanoparticles-Laden Graphene Crumples by Aerosol Spray Pyrolysis and Evaluation of Their Electrocatalytic Activity

Jang

Kim

Chang

et al. 2013

Aerosol Science and Technology

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Pt-nanoparticles-laden graphene (GR) crumples were directly synthesized from a colloidal mixture of aqueous chloroplatinic acid (H 2 PtCl 6 ) and graphene oxide (GO) sheets via aerosol spray pyrolysis (ASP). Effects of Pt content in the Pt/GR composite and temperature of heating zone on the particle morphology, diffraction pattern, and specific surface area were investigated. The morphology of Pt/GR was the shape of a crumpled sheet of paper and the average size of the composite was around 1.3 µm in diameter. As Pt content increased from 2 to 20 wt%, higher numbers of Pt nanoparticles are observed on the GR at higher Pt content and the specific surface area of the composite also increased from 122 to 146 m 2 /g. Also, the intensity of the GR peak decreased, but that of the Pt peak increased. As temperature increased from 500• C to 900 • C, an increase of the particle size of Pt due to sintering was observed. Electrocatalytic application of the Pt/GR composites was examined through methanol oxidation reaction. The 20 wt% Pt/GR synthesized at 900• C showed higher performance on methanol oxidation than a commercial 20 wt% Pt/carbon black catalyst.

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“…To improve the capacitive behavior of graphene-based materials further, only a few studies have investigated the use of graphene coupled with conducting polymers [8][9][10][11]. Also, some researchers are trying to introduce the transition metal oxides/hydroxides with high theoretical specific capacitances into graphene systems [12][13][14][15][16]. In particular, Ni(OH) 2 hexagonal nanoplates grown on graphene sheets have shown both high-power and energy capabilities [17].…”

mentioning

confidence: 99%

“…Also, some researchers are trying to introduce the transition metal oxides/hydroxides with high theoretical specific capacitances into graphene systems [12][13][14][15][16]. In particular, Ni(OH) 2 hexagonal nanoplates grown on graphene sheets have shown both high-power and energy capabilities [17].…”

mentioning

confidence: 99%

Tert-butylhydroquinone-decorated graphene nanosheets and their enhanced capacitive behaviors

Wang

Chang

et al. 2011

Chin. Sci. Bull.

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In the present work, tert-butylhydroquinone (TBHQ) was used to decorate graphene nanosheets to obtain a novel and environmentally friendly electrode material for supercapacitors. The fast redox reactions between hydroquinone and quinone generate pseudocapacitance. Graphene layers which have adsorbed TBHQ interact with each other to construct a three-dimensional network. Through this network, electrolyte ions can easily access the surface of graphene to generate electric double-layer capacitance. Electrochemical measurements have shown that using TBHQ as a redox modifier of graphene can obtain a maximum value of 302 F g -1 and provide a 51% enhancement in specific capacitance. Furthermore, excellent rate capability and cycling ability are achieved using the TBHQ-decorated graphene nanosheet electrode. To improve the capacitive behavior of graphene-based materials further, only a few studies have investigated the use of graphene coupled with conducting polymers [8][9][10][11]. Also, some researchers are trying to introduce the transition metal oxides/hydroxides with high theoretical specific capacitances into graphene systems [12][13][14][15][16]. In particular, Ni(OH) 2 hexagonal nanoplates grown on graphene sheets have shown both high-power and energy capabilities [17]. However, inorganic materials are non-renewable. Their excessive consumption usually causes a series of environmental problems. There are some organic molecules with reversible electrochemical redox couples that could generate pseudocapacitance under a set of given conditions. For instance, 2-nitro-1-naphthol and anthraquinone have been introduced into carbon black [18] and carbon fabric [19], respectively. In the former case, voltammetric and impedance data obtained in a conventional three-electrode cell were reported, but the modified carbon black was not evaluated as a supercapacitor. In the latter case, the use of anthraquinone as a Graphene

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Capacitive behavior of graphene–ZnO composite film for supercapacitors

Cited by 329 publications

References 28 publications

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

One-Step Synthesis of Pt-Nanoparticles-Laden Graphene Crumples by Aerosol Spray Pyrolysis and Evaluation of Their Electrocatalytic Activity

Tert-butylhydroquinone-decorated graphene nanosheets and their enhanced capacitive behaviors

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