Tytuł pozycji:
Solventless synthesis of nanospinel Ni1−xCoxFe2O4 (0 ≤ x ≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance
- Tytuł:
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Solventless synthesis of nanospinel Ni1−xCoxFe2O4 (0 ≤ x ≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance
- Autorzy:
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Nyokong, Tebello
Gupta, Ram K.
Mashazi, Philani
Revaprasadu, Neerish
Malima, Nyemaga Masanje
Choi, Jonghyun
Khan, Malik Dilshad
- Współwytwórcy:
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Department of Chemistry, University of Zululand, South Africa
Department of Chemistry, Rhodes University, South Africa
Department of Chemistry, Pittsburg State University, USA
Institute for Nanotechnology Innovation, Rhodes University, South Africa
Department of Chemistry, College of Natural and Mathematical Sciences, University of Dodoma, Tanzania
Institute of Physical Chemistry, Polish Academy of Sciences
- Słowa kluczowe:
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nanospinel ferrite solid solutions
electrochemical water splitting
- Data publikacji:
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2021-09-20
- Wydawca:
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Royal Society of Chemistry
- Język:
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angielski
- Linki:
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https://pubs.rsc.org/en/content/articlelanding/2021/RA/D1RA04833C  Link otwiera się w nowym oknie
https://depot.ceon.pl/handle/123456789/20821  Link otwiera się w nowym oknie
- Prawa:
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http://creativecommons.org/licenses/by/3.0/pl/
- Dostawca treści:
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Repozytorium Centrum Otwartej Nauki
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Przejdź do źródła  Link otwiera się w nowym oknie
European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 847413 for funding. Scientific work published as part of an international co-financed project founded from the programme of the Minister of Science and Higher Education entitled “PMW” in the years 2020 - 2024; agreement no. 5005/H2020-MSCA-COFUND/2019/2.
The 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.