Optimization of MnO2, NiO and MnO2@NiO electrodes using graphene oxide for supercapacitor applications

Raphael M. Obodo; Hope E. Nsude; Chimezie U. Eze; Benjamin O. Okereke; Sabastine C. Ezugwu; Ishaq Ahmad; M. Maaza; Fabian I. Ezema

Current Research in Green and Sustainable Chemistry (Jan 2022)

Optimization of MnO2, NiO and MnO2@NiO electrodes using graphene oxide for supercapacitor applications

Raphael M. Obodo,
Hope E. Nsude,
Chimezie U. Eze,
Benjamin O. Okereke,
Sabastine C. Ezugwu,
Ishaq Ahmad,
M. Maaza,
Fabian I. Ezema

Affiliations

Raphael M. Obodo: Department of Physics, University of Agriculture and Environmental Sciences, Umuagwo, P. M. B. 1038, Owerri, Imo State, Nigeria; Department of Physics and Astronomy, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria; National Center for Physics, Quaid-i-Azam University, Islamabad, 44000, Pakistan; NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi'an, 710072, China; Corresponding author. Department of Physics, University of Agriculture and Environmental Sciences, Umuagwo, P. M. B. 1038, Owerri, Imo State, Nigeria.
Hope E. Nsude: Department of Physics and Astronomy, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria
Chimezie U. Eze: Department of Physics, Federal University of Technology, Owerri, Imo State, Nigeria
Benjamin O. Okereke: Department of Physics, Federal University of Technology, Owerri, Imo State, Nigeria
Sabastine C. Ezugwu: Department of Physics & Astronomy, University of Western Ontario, 1151 Richmond Street, London, ON, N6A 3K7, Canada
Ishaq Ahmad: National Center for Physics, Quaid-i-Azam University, Islamabad, 44000, Pakistan; NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi'an, 710072, China; Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West, 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa
M. Maaza: Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West, 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa; UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa
Fabian I. Ezema: Department of Physics and Astronomy, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria; Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West, 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa; UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa; Africa Centre of Excellence for Sustainable Power and Energy Development (ACE-SPED), University of Nigeria, Nsukka, Nigeria; Corresponding author. Department of Physics and Astronomy, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria.

Journal volume & issue: Vol. 5
p. 100345

Abstract

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MnO2@GO, NiO@GO and MnO2@NiO@GO electrodes were hydrothermally fabricated for applications in supercapacitor energy storage devices. Because of its large surface area and low electrical resistance, graphene oxide (GO) was added to the nanocomposites during electrode fabrication. The mutual co-operation of diverse components and composites with GO increased the performance, longevity, and hardness of electrodes. The greatest specific capacitance measured by cyclic voltammetry (CV) at 10 mV/s scan rates and GCD at 1.0 A/g current density for MnO2@GO, NiO@GO, and MnO2@NiO@GO, respectively, was 652, 425, 985 and 773, 487, 1141 F/g for MnO2@GO, NiO@GO, and MnO2@NiO@GO. Performances of various electrodes clearly show that composites of two transition metal oxides/GO had better performance when compared to single transition metal oxide/GO and the addition of graphene oxide enhanced the supercapacitive performances of the electrodes.

Published in Current Research in Green and Sustainable Chemistry

ISSN: 2666-0865 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Chemistry
Website: https://www.journals.elsevier.com/current-research-in-green-and-sustainable-chemistry

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