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

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dc.contributor.author Mirghni, Abdulmajid Abdallah
dc.contributor.author Momodu, Damilola Y.
dc.contributor.author Oyedotun, Kabir O.
dc.contributor.author Dangbegnon, Julien K.
dc.contributor.author Manyala, Ncholu I.
dc.date.accessioned 2018-07-26T05:36:58Z
dc.date.issued 2018-09
dc.description.abstract In 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.department Physics en_ZA
dc.description.embargo 2019-09-01
dc.description.librarian hj2018 en_ZA
dc.description.sponsorship The 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.uri http://www.elsevier.com/locate/electacta en_ZA
dc.identifier.citation Mirghni, 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.issn 0013-4686 (print)
dc.identifier.issn 1873-3859 (online)
dc.identifier.other 10.1016/j.electacta.2018.06.181
dc.identifier.uri http://hdl.handle.net/2263/65985
dc.language.iso en en_ZA
dc.publisher Elsevier en_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.subject Graphene foam (GF) en_ZA
dc.subject Electric double layer (EDL) en_ZA
dc.subject Cobalt phosphate en_ZA
dc.subject Iron-carbonized polyaniline en_ZA
dc.subject Hybrid capacitors en_ZA
dc.subject Energy storage en_ZA
dc.subject Foams en_ZA
dc.subject Specific energy density en_ZA
dc.subject Sheet-like structure en_ZA
dc.subject Electrochemical analysis en_ZA
dc.subject Composite electrode en_ZA
dc.subject Asymmetric capacitors en_ZA
dc.subject Supercapacitor en_ZA
dc.subject Potassium hydroxide en_ZA
dc.subject Positive ions en_ZA
dc.subject Polyaniline en_ZA
dc.subject Graphene en_ZA
dc.subject Electrolytes en_ZA
dc.subject Electrochemistry en_ZA
dc.subject Electrochemical electrodes en_ZA
dc.subject Cobalt deposits en_ZA
dc.subject Cobalt compounds en_ZA
dc.subject Cathodes en_ZA
dc.subject Carbonization en_ZA
dc.subject Anodes en_ZA
dc.title Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors en_ZA
dc.type Postprint Article en_ZA


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