| Autor: |
Peter Ondrejka, Michaela Sojková, Valerii Kotok, Patrik Novák, Ivan Hotovy, Martin Kemény, Miroslav Mikolášek |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Materials Research Express, Vol 10, Iss 6, p 065508 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2053-1591 |
| DOI: |
10.1088/2053-1591/acdfaa |
| Popis: |
Nickel-based sulfides (particularly NiS _2 ) are regarded as promising materials for highly efficient electrochemical generation and storage devices. The conventional fabrication methods of nanostructured NiS _X electrodes involve several complex steps using multiple precursors and techniques. In this paper, the NiS _X electrodes are prepared by a plain one-step process of one-zone sulfurization of Ni foam. The evolution of highly electroactive 2D-nanoflakes reliant on sulfurization temperature is studied. Scanning electron microscopy, x-ray diffractometry, and energy-dispersive x-ray spectroscopy confirmed the presence of NiS _X (x = 1 and 2) in the prepared structures. A strong dependence of sample morphology and 2D-nanoflakes density on sulfurization temperature was demonstrated. The electrochemical properties of samples were characterized by cyclic voltammetry and electrochemical impedance spectroscopy measurements. Owing to the 2D-nanoflake structure, the NiS _2 showed attractive electrochemical performance, including a high specific capacitance of 648 mF cm ^−2 and a capacitance retention rate of 90,7% after 3000 cycles. Our study shows that the composition and crystal growth of NiS _X can be tuned by reaction temperature during the sulfurization and high perspective of sulfurization in the synthesis of highly electroactive large-scale electrodes for supercapacitors. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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