Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode

In this work, a birnessite-type MnO2/carbon composite with hierarchical nanostructures was synthesized using KMnO4 solution and spent printing carbon grains. A hybrid electrochemical supercapacitor device was fabricated based on the birnessite-type MnO2–carbon composite electrode and carbonized iron...

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Main Authors:	M. N. Rantho, M. J. Madito, K. O. Oyedotun, D. J. Tarimo, N. Manyala
Format:	Article
Language:	English
Published:	AIP Publishing LLC 2020-06-01
Series:	AIP Advances
Online Access:	http://dx.doi.org/10.1063/5.0011862

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spelling	doaj-11238ace921d4197ada40e674e9e2ec32020-11-25T03:10:46ZengAIP Publishing LLCAIP Advances2158-32262020-06-01106065113065113-1410.1063/5.0011862Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrodeM. N. Rantho0M. J. Madito1K. O. Oyedotun2D. J. Tarimo3N. Manyala4Department of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South AfricaDepartment of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South AfricaDepartment of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South AfricaDepartment of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South AfricaDepartment of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South AfricaIn this work, a birnessite-type MnO2/carbon composite with hierarchical nanostructures was synthesized using KMnO4 solution and spent printing carbon grains. A hybrid electrochemical supercapacitor device was fabricated based on the birnessite-type MnO2–carbon composite electrode and carbonized iron-polyaniline/nickel graphene foam as positive and negative electrodes, respectively. At the lowest specific current of 1.0 A g−1 and cell potential of 2.2 V in 2.5M KNO3 electrolyte, the device displayed a high energy and power density of 34.6 W h kg−1 and 1100.0 W kg−1, respectively. The device further displayed long-term cycling stability with a capacitance retention of 98% over 10 000 galvanostatic charge–discharge cycles at 10 A g−1. This device displays the overall excellent electrochemical performance.http://dx.doi.org/10.1063/5.0011862
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	M. N. Rantho M. J. Madito K. O. Oyedotun D. J. Tarimo N. Manyala
spellingShingle	M. N. Rantho M. J. Madito K. O. Oyedotun D. J. Tarimo N. Manyala Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode AIP Advances
author_facet	M. N. Rantho M. J. Madito K. O. Oyedotun D. J. Tarimo N. Manyala
author_sort	M. N. Rantho
title	Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode
title_short	Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode
title_full	Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode
title_fullStr	Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode
title_full_unstemmed	Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode
title_sort	hybrid electrochemical supercapacitor based on birnessite-type mno2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode
publisher	AIP Publishing LLC
series	AIP Advances
issn	2158-3226
publishDate	2020-06-01
description	In this work, a birnessite-type MnO2/carbon composite with hierarchical nanostructures was synthesized using KMnO4 solution and spent printing carbon grains. A hybrid electrochemical supercapacitor device was fabricated based on the birnessite-type MnO2–carbon composite electrode and carbonized iron-polyaniline/nickel graphene foam as positive and negative electrodes, respectively. At the lowest specific current of 1.0 A g−1 and cell potential of 2.2 V in 2.5M KNO3 electrolyte, the device displayed a high energy and power density of 34.6 W h kg−1 and 1100.0 W kg−1, respectively. The device further displayed long-term cycling stability with a capacitance retention of 98% over 10 000 galvanostatic charge–discharge cycles at 10 A g−1. This device displays the overall excellent electrochemical performance.
url	http://dx.doi.org/10.1063/5.0011862
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Hybrid electrochemical supercapacitor based on birnessite-type MnO2/carbon composite as the positive electrode and carbonized iron-polyaniline/nickel graphene foam as a negative electrode

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