Morphological characterization and impedance spectroscopy study of porous 3D carbons based on graphene foam-PVA/phenol-formaldehyde resin composite as an electrode material for supercapacitors

dc.contributor.authorAbdulhakeem, Bello
dc.contributor.authorFarshad, Barzegar
dc.contributor.authorDamilola, Momodu
dc.contributor.authorFatimeh, Taghizadeh
dc.contributor.authorMopeli, Fabiane
dc.contributor.authorJulien, Dangbegnon
dc.contributor.authorNcholu, Manyala
dc.contributor.emailncholu.manyala@up.ac.zaen_US
dc.date.accessioned2014-10-06T05:47:24Z
dc.date.issued2014
dc.description.abstractThe design and fabrication of porous electrode materials is highly desirable for improving the performance of electrochemical supercapacitors (ECs) and thus, it is important to produce such porous materials in large quantities. In this study, we used a microwave method to produce porous carbonaceous materials designated as graphene foam/polyvinyl alcohol/formaldehyde (GF/PVA/F) and graphene foam-polyvinyl alcohol/phenol-formaldehyde (GF/PVA/PF) from graphene foam, phenol formaldehyde and polyvinyl alcohol (PVA). Scanning electron microscopy (SEM), Raman spectroscopy and Fourier-Transform Infrared Spectroscopy (FTIR) were used to characterize the surface morphology, structural defects and functional groups of the materials respectively. Based on these porous materials, the two symmetrical ECs fabricated exhibited a specific capacitance in the range of 0.62–1.92 F cm 2, phase angles of 81 and 84 and resistor–capacitor (RC) relaxation time constants of 4 and 14 seconds. The physicochemical properties of the electrolyte ion (diffusion) and its influence on the capacitive behavior of the porous materials were elucidated. These encouraging results demonstrate the versatile potential of these porous materials (GF/PVA/F and GF/PVA/PF) in developing high energy storage devices.en_US
dc.description.librarianhb2014en_US
dc.description.sponsorshipSouth African Research Chairs Initiative of the South African Department of Science and Technology (SARCHi-DST), the National Research Foundation (NRF) and the University of Pretoria.en_US
dc.description.urihttp://www.rsc.org/advancesen_US
dc.identifier.citationAbdulhakeem, B, Farshad, B, Damilola, M, Fatemeh, T, Mopeli, F, Julien, D & Ncholu, M 2014, 'Morphological characterization and impedance spectroscopy study of porous 3D carbons based on graphene foam-PVA/phenol-formaldehyde resin composite as an electrode material for supercapacitors', RSC Advances', vol. 73, no. 4, pp. 39066-39072.en_US
dc.identifier.issn2046-2069 (online)
dc.identifier.other10.1039/C4RA05425C
dc.identifier.urihttp://hdl.handle.net/2263/42233
dc.language.isoenen_US
dc.publisherRoyal Society of Chemistryen_US
dc.rights© The Royal Society of Chemistry 2014.en_US
dc.subjectMorphological characterizationen_US
dc.subjectSpectroscopy studyen_US
dc.subjectElectrochemical supercapacitors (ECs)en_US
dc.subjectGraphene foam/polyvinyl alcohol/formaldehyde (GF/PVA/F)en_US
dc.subjectGraphene foam-polyvinyl alcohol/phenol-formaldehyde (GF/PVA/PF)en_US
dc.titleMorphological characterization and impedance spectroscopy study of porous 3D carbons based on graphene foam-PVA/phenol-formaldehyde resin composite as an electrode material for supercapacitorsen_US
dc.typePostprint Articleen_US

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