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Article

Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation

by
Thabo Matthews
1,
Tarekegn Heliso Dolla
2,
Sandile Surprise Gwebu
1,
Tebogo Abigail Mashola
1,
Lihle Tshepiso Dlamini
1,
Emanuela Carleschi
3,
Patrick Ndungu
1 and
Nobanathi Wendy Maxakato
1,*
1
Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa
2
Department of Chemistry, Wolaita Sodo University, Wolaita Sodo P.O. Box 138, Ethiopia
3
Department of Physics, University of Johannesburg, Auckland Park 2006, South Africa
*
Author to whom correspondence should be addressed.
Catalysts 2021, 11(9), 1059; https://doi.org/10.3390/catal11091059
Submission received: 19 July 2021 / Revised: 26 August 2021 / Accepted: 27 August 2021 / Published: 31 August 2021
(This article belongs to the Special Issue Electrocatalytic Activity of Nanocomposites Containing Carbon Materials)
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Abstract

Mn-doped spinel oxides MnxNi1−xCo2O4 (x = 0, 0.3, 0.5, 0.7, and 1) were synthesized using the citric acid-assisted sol–gel method. The Mn0.5Ni0.5Co2O4 (x = 0.5) supported on carbon nanosheets, Mn0.5Ni0.5Co2O4/C, was also prepared using the same method employing NaCl and glucose as a template and carbon source, respectively, followed by pyrolysis under an inert atmosphere. The electrocatalytic oxygen reduction reaction (ORR) activity was performed in alkaline media. Cyclic voltammetry (CV) was used to investigate the oxygen reduction performance of MnxNi1−xCo2O4 (x = 0, 0.3, 0.5, 0.7, and 1), and Mn0.5Ni0.5Co2O4 was found to be the best-performing electrocatalyst. Upon supporting the Mn0.5Ni0.5Co2O4 on a carbon sheet, the electrocatalytic activity was significantly enhanced owing to its large surface area and the improved charge transfer brought about by the carbon support. Rotating disk electrode studies show that the ORR electrocatalytic activity of Mn0.5Ni0.5Co2O4/C proceeds via a four-electron pathway. Mn0.5Ni0.5Co2O4/C was found to possess E1/2(V) = 0.856, a current density of 5.54 mA cm−2, and a current loss of approximately 0.11% after 405 voltammetric scan cycles. This study suggests that the interesting electrocatalytic performance of multimetallic transition metal oxides can be further enhanced by supporting them on conductive carbon materials, which improve charge transfer and provide a more active surface area.
Keywords: spinel oxide; electrocatalyst; oxygen reduction reaction; alkaline fuel cells spinel oxide; electrocatalyst; oxygen reduction reaction; alkaline fuel cells
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MDPI and ACS Style

Matthews, T.; Dolla, T.H.; Gwebu, S.S.; Mashola, T.A.; Dlamini, L.T.; Carleschi, E.; Ndungu, P.; Maxakato, N.W. Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation. Catalysts 2021, 11, 1059. https://doi.org/10.3390/catal11091059

AMA Style

Matthews T, Dolla TH, Gwebu SS, Mashola TA, Dlamini LT, Carleschi E, Ndungu P, Maxakato NW. Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation. Catalysts. 2021; 11(9):1059. https://doi.org/10.3390/catal11091059

Chicago/Turabian Style

Matthews, Thabo, Tarekegn Heliso Dolla, Sandile Surprise Gwebu, Tebogo Abigail Mashola, Lihle Tshepiso Dlamini, Emanuela Carleschi, Patrick Ndungu, and Nobanathi Wendy Maxakato. 2021. "Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation" Catalysts 11, no. 9: 1059. https://doi.org/10.3390/catal11091059

APA Style

Matthews, T., Dolla, T. H., Gwebu, S. S., Mashola, T. A., Dlamini, L. T., Carleschi, E., Ndungu, P., & Maxakato, N. W. (2021). Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation. Catalysts, 11(9), 1059. https://doi.org/10.3390/catal11091059

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