Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared β-Ni(OH) 2 nanostructures
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2018
Authors
Krehula, Stjepko
Ristić, Mira

Wu, Chuchu
Li, Xuning
Jiang, Luhua
Wang, Junhu H.
Sun, Gongquan
Zhang, Tao
Perović, Marija M.

Bošković, Marko

Antić, Bratislav

Kratofil Krehula, Ljerka
Kobzi, Balazs
Kubuki, Shiro

Musić, Svetozar

Article (Published version)

© 2018 Elsevier B.V.
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This paper systematically examines the influence of the level of Fe(III) doping on the crystal structure and other properties of Ni(OH)(2). Reference beta-Ni(OH)(2) and Fe-doped Ni(OH)(2) samples were synthesized by hydrothermal precipitation of mixed Ni(II) and Fe(III) nitrate aqueous solutions in a highly alkaline medium. The samples were investigated using X-ray powder diffraction (XRPD), scanning and transmission electron microscopy (FE-SEM and TEM), energy dispersive X-ray spectroscopy (EDS), Mossbauer spectroscopy, magnetic measurements, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy, thermogravimetric analysis (TGA) and electrochemical measurements. Incorporation of Fe in beta-Ni(OH)(2) by cation substitution was confirmed from the shifts in position of XRPD lines due to the difference in the ionic radius of Fe3+ and Ni-2. The Fe-3-for-Ni2+ substitution in beta-Ni(OH)(2) caused formation of an interstratifled structur...e with beta-Ni(OH)(2) and alpha-Ni(OH)(2) structural units interconnected within the same structural layers and crystallites. Mossbauer spectra revealed the presence of Fe3+ ions in highly distorted octahedral sites, presumably at the boundary between the alpha-Ni(OH)(2) and beta-Ni(OH)(2) structural units within the same structural layer. Electrochemical measurements showed significant increase in oxygen evolution reaction (OER) catalytic activity of Fe-doped Ni(OH)(2) compared to pure phase. (C) 2018 Elsevier B.V. All rights reserved.
Keywords:
nickel hydroxide / beta-Ni(OH)(2) / iron doping / interstratification / Mossbauer spectroscopy / OER catalystSource:
Journal of Alloys and Compounds, 2018, 750, 687-695Projects:
- Croatian Science Foundation (IP-2016-06-8254)
- SAFU (KK.01.1.1.01.0001)
- Strategic Priority Research Program of the Chinese Academy of Sciences (XDA09030104)
- Natural Science Foundation of China (21576258)
- Natural Science Foundation of China (21476232)
- bilateral Croatian-Chinese scientific project "Synthesis and characterization of iron oxide nanoparticles and nanofibers and their application in environmental catalysis"
- bilateral Croatian-Serbian scientific project " Nanostructured iron oxides for environmental applications"
DOI: 10.1016/j.jallcom.2018.04.032
ISSN: 0925-8388; 1873-4669