Preparation of reduced graphene oxide/cobalt oxide composites and their enhanced capacitive behaviors by homogeneous incorporation of reduced graphene oxide sheets in cobalt oxide matrix

Wang, Huanwen; Hu, Zhongai; Chang, Yan-Qin; Chen, Yanli; Zhang, Ziyu; Yang, Yuying; Wu, Hongying

doi:10.1016/j.matchemphys.2011.07.043

Cited by 147 publications

(38 citation statements)

References 43 publications

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“…Graphite powder (4 g) was added and the mixture was stirred for 1 day at ambient conditions. 16,17 The treated GO/Co/chitosan particles were washed for 20 minutes with deionized (DI) water, centrifuged at 7,500 rpm, and dried overnight at 60 • C. To modify GO with CoCl 2 · 6H 2 O, 0.02 mol GO was dispersed in 2.0 M CoCl 2 · 6H 2 O for 18 h to obtain the GO/Co suspension. NH 4 OH (30%) was added to the mixture to extend the Co(OH) 2 and to form the Co(OH) 2 layer on the GO surface by increasing pH to 9.0.…”

Section: Methodsmentioning

confidence: 99%

Development of Electron Transfer Mediator Using Modified Graphite Oxide/Cobalt for Enzymatic Fuel Cell

Kim

Yang

et al. 2015

J. Electrochem. Soc.

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In an enzymatic fuel cell system, mediation of electron transfer is one of most important components supporting enzymes on electrode surfaces and transferring electrons from oxidation reaction. Various materials were tested as mediators for efficient electron transfer. The electrode preparation process was optimized using the selected material. Cobalt (Co) showed good performance as an electron transfer mediator. CoCl 2 of 0.02 mol was the most effective concentration for a high-quality graphite oxide (GO)/Co composite. A reaction time of 18 h was optimal for significantly improved power density. Self-assembled glucose oxidase (GOx) and laccase were used as the anode biocatalyst and cathode biocatalyst, respectively, on Au electrodes. The enzymatic fuel cell produced a cell voltage of −0.578 V vs Ag/AgCl. The highest power density (1,058 μW/cm 2 ) was generated at the optimal condition. Molecular properties of the developed electron transfer mediator using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were identified by observing the changes of the composite at the micro-surface level.

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Section: Methodsmentioning

confidence: 99%

Development of Electron Transfer Mediator Using Modified Graphite Oxide/Cobalt for Enzymatic Fuel Cell

Kim

Yang

et al. 2015

J. Electrochem. Soc.

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“…could be assigned to the skeletal vibrations of unoxidized graphitic domains. By contrast, the spectra of Co 3 O 4 /GO differed from that of GO, as proven by the weakening of the peaks of C O and O H at 1630 and 3439 cm −1 , respectively[73]. In addition, they show strong absorptions at 660 and 575 cm −1 because of the formation of Co 3 O 4 .…”

mentioning

confidence: 88%

Supported cobalt oxide on graphene oxide: Highly efficient catalysts for the removal of Orange II from water

Shi

Zhu

et al. 2012

Journal of Hazardous Materials

170

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“…This powder also has a very high capacitive retaining of 88% in more than 1000 cycles. Likewise, Wang et al developed a Co 3 O 4 in GO nanocomposites with a well‐enhanced performance, this nanocomposite was produced from GO‐Co(OH) 2 in which its performance is far much better compared with cobalt alone, and Nwanya et al used simple successive ionic layer adsorption and reaction (SILAR) method and also obtained high‐performance Co 3 O 4 electrodes.…”

Section: Introductionmentioning

confidence: 99%

Conjugated NiO‐ZnO/GO nanocomposite powder for applications in supercapacitor electrodes material

et al. 2020

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Summary The nanocomposite of NiO‐ZnO/graphene oxide (GO) was synthesized for applications in supercapacitor electrodes material. GO was produced using the modified Hummers' method, and the nanocomposite of NiO‐ZnO/GO was synthesized using the co‐precipitation method. Thin films of nanocomposite powder were deposited on quartzite (glass) and fluorine‐doped tin oxide substrates by a drop casting technique. X‐ray diffraction revealed the crystallographic information of NiO‐ZnO/GO nanocomposites. The surface morphology and elemental composition were studied using a scanning electron microscopy and energy‐dispersive X‐ray spectroscopy, respectively. The electrochemical properties were examined using cyclic voltammetry in a 1.0 M solution of Na2SO4 electrolyte with a three‐electrode system. Moreover, the NiO‐ZnO/GO binary metal oxides nanocomposite based electrodes fabricated for supercapacitor delivered a high specific capacitance of 1690 F g−1 for 1:1/GO sample at a scan rate of 10 mV s−1 and has excellent conductivity due to reduced band gap energy range of 1.52‐1.79 eV and with electrodes resistance of 0.02 Ω. The absence of semicircle in the Nyquist plot denotes low charge transfer resistance of the electrodes. The highest energy densities obtained for 1:1/GO and 2:1/GO are 192 and 148 Wh kg−1, respectively, while the highest power density obtained for 1:1/GO and 2:1/GO are 8.46 and 7.42 W kg−1, respectively. Our study paves way for a facile, affordable, nontoxic, and fast way to synthesis binary transition metal oxides/GO‐based electrodes material for high‐performance supercapacitor.

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Preparation of reduced graphene oxide/cobalt oxide composites and their enhanced capacitive behaviors by homogeneous incorporation of reduced graphene oxide sheets in cobalt oxide matrix

Cited by 147 publications

References 43 publications

Development of Electron Transfer Mediator Using Modified Graphite Oxide/Cobalt for Enzymatic Fuel Cell

Development of Electron Transfer Mediator Using Modified Graphite Oxide/Cobalt for Enzymatic Fuel Cell

Supported cobalt oxide on graphene oxide: Highly efficient catalysts for the removal of Orange II from water

Conjugated NiO‐ZnO/GO nanocomposite powder for applications in supercapacitor electrodes material

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