Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared β-Ni(OH) 2 nanostructures
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Wang, Junhu H.
Perović, Marija M.
Kratofil Krehula, Ljerka
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 catalyst
Source:Journal of Alloys and Compounds, 2018, 750, 687-695
- 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"
ISSN: 0925-8388 (print); 1873-4669 (electronic)