Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors

dc.contributor.authorMirghni, Abdulmajid Abdallah
dc.contributor.authorMomodu, Damilola Y.
dc.contributor.authorOyedotun, Kabir Oyeniran
dc.contributor.authorDangbegnon, Julien K.
dc.contributor.authorManyala, Ncholu I.
dc.contributor.emailncholu.manyala@up.ac.zaen_ZA
dc.date.accessioned2018-07-26T05:36:58Z
dc.date.issued2018-09
dc.description.abstractIn this paper, we explore the successful hydrothermal approach to make Co3(PO4)2·4H2O/GF micro-flakes composite material. The unique sheet-like structure of the graphene foam (GF) significantly improved the conductivity of the pristine Co-based material, which is a key limitation in supercapacitors application. The composite electrode material exhibited superior capacitive conduct in 6 M KOH aqueous electrolyte in a 3-electrode set-up as compared to the pristine cobalt phosphate material. The material was subsequently adopted as a cathode in an asymmetric cell configuration with carbonization of Fe cations adsorbed onto polyaniline (PANI) (C-Fe/PANI), as the anode. The Co3(PO4)2·4H2O/GF//C-FP hybrid device showed outstanding long life cycling stability of approximately 99% without degradation up to 10000 cycles. A specific energy density as high as 24 W h kg−1, with a corresponding power density of 468 W kg−1 was achieved for the device. The results demonstrated the efficient utilization of the faradic-type Co3(PO4)2·4H2O/GF composite along with a functionalized carbonaceous electric double layer (EDL)-type material to produce a hybrid device with promising features suitable for energy storage applications.en_ZA
dc.description.departmentPhysicsen_ZA
dc.description.embargo2019-09-01
dc.description.librarianhj2018en_ZA
dc.description.sponsorshipThe South African Research Chairs Initiative (SARChI) of the Department of Science and Technology and the National Research Foundation (NRF) of South Africa (Grant No. 61056). Abdulmajid A. Mirghni acknowledges the financial support from University of Pretoria, the NRF through the SARChI in Carbon Technology and Materials, and also Al Fashir University, Sudan.en_ZA
dc.description.urihttp://www.elsevier.com/locate/electactaen_ZA
dc.identifier.citationMirghni, A.A., Momodu, D., Oyedotun, K.O. et al. 2018, 'Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors', Electrochimica Acta, vol. 283, pp. 374-384.en_ZA
dc.identifier.issn0013-4686 (print)
dc.identifier.issn1873-3859 (online)
dc.identifier.other10.1016/j.electacta.2018.06.181
dc.identifier.urihttp://hdl.handle.net/2263/65985
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2018 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Electrochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Electrochimica Acta, vol. 283, pp. 374-384, 2018. doi : 10.1016/j.electacta.2018.06.181.en_ZA
dc.subjectGraphene foam (GF)en_ZA
dc.subjectElectric double layer (EDL)en_ZA
dc.subjectCobalt phosphateen_ZA
dc.subjectIron-carbonized polyanilineen_ZA
dc.subjectHybrid capacitorsen_ZA
dc.subjectEnergy storageen_ZA
dc.subjectFoamsen_ZA
dc.subjectSpecific energy densityen_ZA
dc.subjectSheet-like structureen_ZA
dc.subjectElectrochemical analysisen_ZA
dc.subjectComposite electrodeen_ZA
dc.subjectAsymmetric capacitorsen_ZA
dc.subjectSupercapacitoren_ZA
dc.subjectPotassium hydroxideen_ZA
dc.subjectPositive ionsen_ZA
dc.subjectPolyanilineen_ZA
dc.subjectGrapheneen_ZA
dc.subjectElectrolytesen_ZA
dc.subjectElectrochemistryen_ZA
dc.subjectElectrochemical electrodesen_ZA
dc.subjectCobalt depositsen_ZA
dc.subjectCobalt compoundsen_ZA
dc.subjectCathodesen_ZA
dc.subjectCarbonizationen_ZA
dc.subjectAnodesen_ZA
dc.titleElectrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitorsen_ZA
dc.typePostprint Articleen_ZA

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