Synthesis and characterization of porous carbon derived from activated banana peels with hierarchical porosity for improved electrochemical performance

dc.contributor.authorFasakin, Oladepo
dc.contributor.authorDangbegnon, Julien K.
dc.contributor.authorMomodu, Damilola Y.
dc.contributor.authorMadito, M.J. (Moshawe)
dc.contributor.authorOyedotun, Kabir Oyeniran
dc.contributor.authorEleruja, M.A.
dc.contributor.authorManyala, Ncholu I.
dc.contributor.emailncholu.manyala@up.ac.zaen_ZA
dc.date.accessioned2018-04-25T05:53:28Z
dc.date.issued2018-02
dc.description.abstractBanana peels, a common fruit waste was adopted as a material precursor in this study to synthesize highly porous activated carbon from banana peels (ABP) which serves as an electrode material for a symmetric supercapacitor device. The activation was done using KOH pellets at different carbonization temperatures ranging from 750 °C to 950 °C. The ABP sample obtained from the 900 °C carbonization temperature (ABP900) exhibited unique material properties such as hierarchical porous nano-architecture containing micropores, and mesopores with the highest specific surface area (1362 m2 g−1). Electrochemical performance investigation in different neutral aqueous electrolytes showed that the best response was obtained in NaNO3 for the ABP900 electrode. The symmetric device subsequently assembled using 1 M NaNO3 operated in a potential window of 1.8 V, exhibited a specific capacitance of 165 F g−1 with a corresponding energy density of 18.6 W h kg−1 at 0.5 A g−1. A 100% capacitance retention and columbic efficiency were obtained after 10000 continuous charge-discharge cycles at 5 A g−1. Remarkably, after subjecting the symmetric device to a voltage holding test for 60 h, the specific capacitance was observed to increase from 165 F g−1 to 328 F g−1 with a corresponding increased energy density to about 36.9 W h kg−1 at 0.5 A g−1, suggesting a 98% increase in device energy density from its initial value after voltage holding. Thus, the results reported showcase the ABP900 material as a potential nanostructured porous material useful in the design of high-performance electrodes for stable electrochemical capacitors.en_ZA
dc.description.departmentPhysicsen_ZA
dc.description.embargo2019-02-01
dc.description.librarianhj2018en_ZA
dc.description.sponsorshipThe South African Research Chairs Initiative (SARChI) of the Department of Science and Technology, the National Research Foundation (NRF) of South Africa (Grant No. 61056).en_ZA
dc.description.urihttp://www.elsevier.com/locate/electactaen_ZA
dc.identifier.citationFasakin, O., Dangbegnon, J.K., Momodu, D.Y. et al. 2018, 'Synthesis and characterization of porous carbon derived from activated banana peels with hierarchical porosity for improved electrochemical performance', Electrochimica Acta, vol. 262, pp. 187-196.en_ZA
dc.identifier.issn0013-4686 (print)
dc.identifier.issn1873-3859 (online)
dc.identifier.other10.1016/j.electacta.2018.01.028
dc.identifier.urihttp://hdl.handle.net/2263/64713
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. 262, pp. 187-196, 2018. doi : 10.1016/j.electacta.2018.01.028.en_ZA
dc.subjectActivated banana peel (ABP)en_ZA
dc.subjectElectrodesen_ZA
dc.subjectHigh energy densityen_ZA
dc.subjectRaman spectraen_ZA
dc.subjectElectrolytesen_ZA
dc.subjectCapacitorsen_ZA
dc.subjectSupercapacitors (SCs)en_ZA
dc.subjectElectrochemical capacitors (ECs)en_ZA
dc.subjectRice husken_ZA
dc.subjectHydrated ionsen_ZA
dc.titleSynthesis and characterization of porous carbon derived from activated banana peels with hierarchical porosity for improved electrochemical performanceen_ZA
dc.typePostprint Articleen_ZA

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