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Browsing University of Pretoria: Research Output by UP Author "Dangbegnon, Julien K."
Now showing items 1-20 of 40
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Momodu, Damilola Y.; Madito, M.J. (Moshawe); Barzegar, Farshad; Bello, Abdulhakeem; Khaleed, Abubakar A.; Olaniyan, Okikiola; Dangbegnon, Julien K.; Manyala, Ncholu I. (Springer, 2017-03)Activated carbon from tree bark (ACB) has been synthesized by a facile and environmentally friendly activation and carbonization process at different temperatures (600, 700 and 800 °C) using potassium hydroxide (KOH) ...
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Barzegar, Farshad; Bello, Abdulhakeem; Dangbegnon, Julien K.; Manyala, Ncholu I.; Xia, Xiaohua (Elsevier, 2017-12)This work presents results obtained from the production of low-cost carbons from expanded graphite (EG) and pinecone (PC) biomass, activated in potassium hydroxide (KOH) and finally carbonized in argon and hydrogen atmosphere. ...
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Bello, Abdulhakeem; Barzegar, Farshad; Momodu, Damilola Y.; Dangbegnon, Julien K.; Taghizadeh, Fatemeh; Fabiane, Mopeli; Manyala, Ncholu I. (Elsevier, 2015-01)We present the electrochemical results of highly porous and interconnected carbon material by activation of graphene foam/polyvinyl alcohol-formaldehyde composite material designated as GF/PVA-F. Asymmetric supercapacitor ...
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Masikhwa, T.M. (Tshifhiwa); Barzegar, Farshad; Dangbegnon, Julien K.; Madito, M.J. (Moshawe); Bello, Abdulhakeem; Momodu, Damilola Y.; Manyala, Ncholu I. (Royal Society of Chemistry, 2016-04)VS2 nanosheets as the positive electrode and the activated carbon (AC) as the negative electrode with a 6 M KOH solution as electrolyte were fabricated as an asymmetric supercapacitor. These materials were combined to ...
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Manyala, Ncholu I.; Bello, Abdulhakeem; Barzegar, Farshad; Khaleed, Abubakar A.; Momodu, Damilola Y.; Dangbegnon, Julien K. (Elsevier, 2016-10)Low-cost biomass-derived activated porous carbon from natural pine cones is synthesized using hydrothermal approach followed by KOH activation and carbonization. The produced carbon materials have a high surface area of ...
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Barzegar, Farshad; Khaleed, Abubakar A.; Ugbo, F.U.; Oyeniran, K.O.; Momodu, Damilola Y.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Manyala, Ncholu I. (American Institute of Physics, 2016)This work present two-step synthesizes route to low-cost mesoporous carbon from coconut shell. The electrochemical characterization of the coconut shell based activated carbon (CSAC) material as electrode for supercapacitor ...
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Madito, M.J. (Moshawe); Bello, Abdulhakeem; Dangbegnon, Julien K.; Oliphant, C.J.; Jordaan, W.A.; Momodu, Damilola Y.; Masikhwa, T.M. (Tshifhiwa); Barzegar, Farshad; Fabiane, M.; Manyala, Ncholu I. (American Institute of Physics, 2016-01-07)A bilayer graphene film obtained on copper (Cu) foil is known to have a significant fraction of non-Bernal (AB) stacking and on copper/nickel (Cu/Ni) thin films is known to grow over a large-area with AB stacking. In ...
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Khaleed, Abubakar A.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Momodu, Damilola Y.; Madito, M.J. (Moshawe); Ugbo, F.U.; Akande, A.A.; Dhonge, B.P.; Barzegar, Farshad; Olaniyan, Okikiola; Mwakikunga, B.W.; Manyala, Ncholu I. (Elsevier, 2017-02)NiO/activated carbon (AC) composites were successfully synthesized via a hydrothermal reflux process as an electrode material for carbon monoxide (CO) gas sensor application. The X-ray diffraction (XRD) analysis was used ...
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Barzegar, Farshad; Dangbegnon, Julien K.; Bello, Abdulhakeem; Momodu, Damilola Y.; Johnson, Alan T. Charlie; Manyala, Ncholu I. (American Institute of Physics, 2015-09-24)This article is focused on polymer based gel electrolyte due to the fact that polymers are cheap and can be used to achieve extended potential window for improved energy density of the supercapacitor devices when compared ...
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Ndiaye, Ndeye Maty; Masikhwa, T.M. (Tshifhiwa); Ngom, B.D.; Madito, M.J. (Moshawe); Oyedotun, Kabir Oyeniran; Dangbegnon, Julien K.; Manyala, Ncholu I. (Elsevier, 2018-08)In this work, we report the time-dependent morphological evolution of the as-prepared vanadium dioxide (VO2) and its electrochemical performance for supercapacitor applications. VO2 with different morphologies (microspheres ...
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Mirghni, Abdulmajid Abdallah; Momodu, Damilola Y.; Oyedotun, Kabir Oyeniran; Dangbegnon, Julien K.; Manyala, Ncholu I. (Elsevier, 2018-09)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 ...
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Moyo, Belinda; Momodu, Damilola Y.; Fasakin, Oladepo; Bello, Abdulhakeem; Dangbegnon, Julien K.; Manyala, Ncholu I. (Springer, 2018-04)In this study, activated carbon was derived from polypyrrole (PPY) using a K2CO3 activating agent with varying mass ratios of the activating agent to PPY polymer (AA:PP), for the optimization of the hierarchical pore ...
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Guellati, O.; Harat, A.; Momodu, Damilola Y.; Dangbegnon, Julien K.; Romero, T.; Begin, D.; Pham-Huu, C.; Manyala, Ncholu I.; Guerioune, M. (Elsevier, 2018-06)Please read abstract in the article.
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Bello, Abdulhakeem; Fashedemi, Omobosede O.; Momodu, Damilola Y.; Barzegar, Farshad; Masikhwa, T.M. (Tshifhiwa); Madito, M.J. (Moshawe); Taghizadeh, Fatemeh; Dangbegnon, Julien K.; Manyala, Ncholu I. (Elsevier, 2015-08)A microwave irradiation method has been used to prepare mixed nickel cobalt sulfide (NixCoyS4) nanosheets with different stoichiometric composition as electrodes for electrochemical capacitors. This study has been ...
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Momodu, Damilola Y.; Bello, Abdulhakeem; Oyedotun, Kabir Oyeniran; Ochai-Ejeh, F.O. (Faith); Dangbegnon, Julien K.; Madito, M.J. (Moshawe); Manyala, Ncholu I. (Royal Society of Chemistry, 2017-07-26)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 ...
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Khaleed, Abubakar A.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Ugbo, F.U.; Barzegar, Farshad; Momodu, Damilola Y.; Madito, M.J. (Moshawe); Masikhwa, T.M. (Tshifhiwa); Olaniyan, Okikiola; Manyala, Ncholu I. (Springer, 2016-06)Ni(OH)2/graphene foam (GF) electrode was synthesized for electrochemical application by a facile hydrothermal reflux technique. The results obtained from the scanning electron microscopy showed that the Ni(OH)2 spheres ...
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Bello, Abdulhakeem; Fabiane, Mopeli; Momodu, Damilola Y.; Khamlich, Saleh; Dangbegnon, Julien K.; Manyala, Ncholu I. (Springer, 2014-09)We report on a non-covalent functionalization of graphene foam (GF) synthesized via chemical vapour deposition (CVD). The GF was treated with pyrene carboxylic acid (PCA) which acted as a source of oxygen and/or ...
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Bello, Abdulhakeem; Dangbegnon, Julien K.; Momodu, Damilola Y.; Ochai-Ejeh, F.O. (Faith); Oyedotun, Kabir Oyeniran; Manyala, Ncholu I. (Royal Society of Chemistry, 2018)Porous carbon nanostructures have long been studied because of their importance in many natural phenomena and their use in numerous applications. A more recent development is the ability to produce porous carbon materials ...
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Fabiane, Mopeli; Khamlich, Saleh; Bello, Abdulhakeem; Dangbegnon, Julien K.; Momodu, Damilola Y.; Johnson, Alan T. Charlie; Manyala, Ncholu I. (American Institute of Physics, 2013-11)We present a simple and very convincing approach to visualizing that subsequent layers of graphene grow between the existing monolayer graphene and the copper catalyst in chemical vapor deposition (CVD). Graphene samples ...
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Ochai-Ejeh, F.O. (Faith); Bello, Abdulhakeem; Dangbegnon, Julien K.; Khaleed, Abubakar A.; Madito, M.J. (Moshawe); Bazegar, Farshad; Manyala, Ncholu I. (Springer, 2017-09)Activated carbon (AC) derived from biomass lightweight cork (Quercus suber) material was synthesized by KOH activation with different mass ratios of Q. suber: KOH in order to investigate the electrochemical properties of ...
Now showing items 1-20 of 40