Enhanced electrochemical response of activated carbon nanostructures from tree-bark biomass waste in polymer-gel active electrolytes

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dc.contributor.author Momodu, Damilola Y.
dc.contributor.author Bello, Abdulhakeem
dc.contributor.author Oyedotun, Kabir O.
dc.contributor.author Ochai-Ejeh, Faith O.
dc.contributor.author Dangbegnon, Julien K.
dc.contributor.author Madito, M.J. (Moshawe)
dc.contributor.author Manyala, Ncholu I.
dc.date.accessioned 2017-09-11T05:39:51Z
dc.date.available 2017-09-11T05:39:51Z
dc.date.issued 2017-07-26
dc.description.abstract Activated carbon (ACB) obtained from tree bark waste biomass was obtained by adopting an optimized activation and carbonization route using potassium hydroxide (KOH) pellets. The morphological and structural characteristics of the optimized carbon material revealed a porous network suitable for charge storage. The potential of the ACB material as a suitable supercapacitor electrode was investigated in a symmetric two electrode cell configuration using a polymer-gel/KOH active electrolyte. The KOH was included to improve ionic mobility within the polyvinyl alcohol (PVA) gel, while carbon acetylene black and a polymer-fullerene blend acted as the conductive additives. The cell exhibited an EDLC behaviour in all electrolytes with the PVA/KOH/carbon black (PKCB) electrolyte portraying the best electrochemical response with a 1.4 V voltage window. A specific capacitance (CSP) of 227 F g 1 was obtained with a corresponding energy density of 15.5 W h kg 1 and power density of 700 W kg 1 at a current density of 0.5 A g 1. An excellent stability was exhibited with a coulombic efficiency of 98% after 5000 continuous cycles at 5.0 A g 1 and a slight deterioration of the ideal electrochemical behavior was observed after further subjecting the electrode to a floating test for 120 h (5 days) at 1.4 V. Interestingly, the gel-based electrolyte showed a peculiar “recuperating behavior” after further floating process and negligible charge loss after a self-discharge process for 30 h at 1.0 A g 1 which demonstrates the viability for adopting gel-electrolytes in SC devices from plant biomass waste. en_ZA
dc.description.department Physics en_ZA
dc.description.librarian am2017 en_ZA
dc.description.sponsorship The South African Research Deparment Initiative of the Department of Science and Technology, Republic of South Africa and National Research Foundation of South Africa (Grant no. 61056). en_ZA
dc.description.uri http://www.rsc.org/advances en_ZA
dc.identifier.citation Momodu, D., Bello, A., Oyedotun, K., Ochai-Ejeh, F., Dangbegnon, J., Madito, M. & Manyala, N. Enhanced electrochemical response of activated carbon nanostructures from tree-bark biomass waste in polymer-gel active electrolytes. RSC Advances, 2017, 7, 37286-37295. en_ZA
dc.identifier.issn 2046-2069 (online)
dc.identifier.other 10.1039/c7ra05810a
dc.identifier.uri http://hdl.handle.net/2263/62201
dc.language.iso en en_ZA
dc.publisher Royal Society of Chemistry en_ZA
dc.rights © The Royal Society of Chemistry 2017. This article is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. en_ZA
dc.subject Potassium hydroxide en_ZA
dc.subject Activated carbon (ACB) en_ZA
dc.subject Polyelectrolytes en_ZA
dc.subject Supercapacitor electrodes en_ZA
dc.subject Structural characteristics en_ZA
dc.subject Specific capacitance en_ZA
dc.subject Polyvinyl alcohol gels en_ZA
dc.subject Polymer-fullerene blends en_ZA
dc.subject Electrochemical response en_ZA
dc.subject Electrochemical behaviors en_ZA
dc.subject Nanostructures en_ZA
dc.subject Carbon en_ZA
dc.subject Solid electrolytes en_ZA
dc.subject Polymers en_ZA
dc.subject Forestry en_ZA
dc.subject Electrolytes en_ZA
dc.subject Electrodes en_ZA
dc.subject Electrochemical electrodes en_ZA
dc.subject Electric discharges en_ZA
dc.subject Carbonization en_ZA
dc.subject Capacitance en_ZA
dc.subject Biomass en_ZA
dc.title Enhanced electrochemical response of activated carbon nanostructures from tree-bark biomass waste in polymer-gel active electrolytes en_ZA
dc.type Article en_ZA


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