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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/654154E8-8465-439C-8FD3-C634433D2DA7 | ||
| Year | 2023 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | I. A. Poimenidis, M. Lykaki, N. Papakosta, P. A. Loukakos, N. Kallithrakas Kontos, and M. Konsolakis, “One-step electrodeposition of NiS heterostructures on nickel foam electrodes for hydrogen evolution reaction: on the impact of thiourea content,” Results Chem., vol. 6, Dec. 2023, doi: 10.1016/j.rechem.2023.101216. https://doi.org/10.1016/j.rechem.2023.101216 | ||
| Appears in Collections |
Herein, we report on the one-step growth of nickel sulfide (NiS) heterostructures on nickel foam (NF) substrate via a facile electrodeposition method, employing Ni(NO3)2·6H2O and CH4N2S as Ni and S precursors, respectively. For the first time, a systematic study was carried out on the impact of the Ni/S molar ratio on the electrochemical performance of as-prepared electrodes for water splitting. The optimum performance was obtained for a Ni:S ratio equal to 2:1, whereas lower or higher ratios resulted in much inferior performance. The NiS@NF electrode with a Ni:S ratio of 2:1 exhibited the lowest overpotentials |η10| = 136 mV, |η100| = 209 mV, extremely low Tafel slope (60 mV dec-1), and very high double layer capacitance value (2.78 mF cm−2). Field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), and X-ray photoelectron spectroscopy (XPS) revealed the formation of a coral-like nanoarchitecture, resulting in enhanced HER activity.
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