Solventless synthesis of nanospinel Ni 1− x Co x Fe 2 O 4 (0≤ x≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance

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dc.creatorMalima, Nyemaga Masanje
dc.creatorMalik, Dilshad Khan
dc.creatorChoi, Jonghyun
dc.creatorGupta, Ram K.
dc.creatorMashazi, Philani
dc.creatorNyokong, Tebello
dc.creatorRevaprasadu, Neerish
dc.date2022-07-08T08:35:32Z
dc.date2022-07-08T08:35:32Z
dc.date2021
dc.date.accessioned2022-10-20T13:09:31Z
dc.date.available2022-10-20T13:09:31Z
dc.descriptionFull text article. Also available at https://doi.org/10.1039/D1RA04833C
dc.descriptionThe formation of solid solutions represents a robust strategy for modulating the electronic properties and improving the electrochemical performance of spinel ferrites. However, solid solutions have been predominantly prepared via wet chemical routes, which involve the use of harmful and/or expensive chemicals. In the present study, a facile, inexpensive and environmentally benign solventless route is employed for the composition-controlled synthesis of nanoscopic Ni1−xCoxFe2O4 (0 ≤ x ≤ 1) solid solutions. The physicochemical characterization of the samples was performed by p-XRD, SEM, EDX, XPS, TEM, HRTEM and UV-Vis techniques. A systematic investigation was also carried out to elucidate the electrochemical performance of the prepared nanospinels towards energy generation and storage. Based on the results of CV, GCD, and stability tests, the Ni0.4Co0.6Fe2O4 electrode showed the highest performance for the supercapacitor electrode exhibiting a specific capacitance of 237 F g−1, superior energy density of 10.3 W h kg−1 and a high power density with a peak value of 4208 W kg−1, and 100% of its charge storage capacity was retained after 4000 cycles with 97% coulombic efficiency. For HER, the Ni0.6Co0.4Fe2O4 and CoFe2O4 electrodes showed low overpotentials of 168 and 169 mV, respectively, indicating better catalytic activity. For OER, the Ni0.8Co0.2Fe2O4 electrode exhibited a lower overpotential of 320 mV at a current density of 10 mA cm−2, with a Tafel slope of 79 mV dec−1, demonstrating a fast and efficient process. These results indicated that nanospinel ferrite solid solutions could be employed as promising electrode materials for supercapacitor and water splitting applications.
dc.identifierMalima, N. M., Khan, M. D., Choi, J., Gupta, R. K., Mashazi, P., Nyokong, T., & Revaprasadu, N. (2021). Solventless synthesis of nanospinel Ni 1− x Co x Fe 2 O 4 (0≤ x≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance. RSC Advances, 11(49), 31002-31014.
dc.identifierDOI: 10.1039/D1RA04833C
dc.identifierhttp://hdl.handle.net/20.500.12661/3527
dc.identifier.urihttp://hdl.handle.net/20.500.12661/3527
dc.languageen
dc.publisherThe Royal Society of Chemistry
dc.subjectsolid solution
dc.subjectElectronic properties
dc.subjectSpinel ferrites
dc.subjectNanospinel
dc.subjectSupercapacitance
dc.subjectNi1−xCoxFe2O4 (0 ≤ x ≤ 1)
dc.subjectNanospinel ferrite
dc.subjectNanospinel ferrite solid solutions
dc.titleSolventless synthesis of nanospinel Ni 1− x Co x Fe 2 O 4 (0≤ x≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance
dc.typeArticle

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