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Synthesis and Properties of Ni-doped Goethite and Ni-doped Hematite Nanorods

Krehula, Stjepko; Ristić, Mira; Mitar, Ivana; Wu, Chuchu; Li, Xuning; Jiang, Luhua; Wang, Junhu; Sun, Gongquan; Zhang, Tao; Perović, Marija; Bošković, Marko; Antić, Bratislav; Musić, Svetozar (2018) Synthesis and Properties of Ni-doped Goethite and Ni-doped Hematite Nanorods. Croatica Chemica Acta, 91 (3). pp. 389-401. ISSN 0011-1643

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Abstract

Ni-doped goethite (α-FeOOH) nanorods were synthesized from mixed Fe(III)-Ni(II) nitrate solutions with various Ni/(Ni+Fe) ratios (0, 5, 10, 20, 33 and 50 mol % Ni) by hydrothermal precipitation in a highly alkaline medium using the strong organic alkali, tetramethyl¬ammonium hydroxide (TMAH). Ni-doped hematite (α-Fe2O3) nanorods were obtained by calcination of Ni- doped goethite nanorods at 400 °C. The Ni2+- for-Fe3+ substitution in goethite and hematite was confirmed by determination of the unit cell expansion (due to the difference in the ionic radii of Fe3+ and Ni2+) using XRPD and determination of the reduction of a hyperfine magnetic field (due to the difference in magnetic moments of Fe3+ and Ni2+) using Mössbauer spectroscopy. Single- phase goethite nanorods were found in samples containing 0 or 5 mol % Ni. A higher Ni content in the precipitation system (10 mol % or more) resulted in a higher Ni2+-for-Fe3+ substitution in goethite, and larger Ni-doped goethite nanorods, though with the presence of low crystalline Ni-containing ferrihydrite and Ni ferrite (NiFe2O4) as additional phases. Significant changes in FT-IR and UV-Vis-NIR spectra of prepared samples were observed with increasing Ni content. Electrochemical measurements of samples showed a strong increase in oxygen evolution reaction (OER) electrocatalytic activity with increasing Ni content.

Item Type: Article
Uncontrolled Keywords: α-FeOOH ; α-Fe2O3 ; Ni doping ; XRPD ; Mössbauer spectroscopy ; FE-SEM ; OER
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Chemistry
Projects:
Project titleProject leaderProject codeProject type
Nastajanje i svojstva 1D a-Fe2O3 nanostruktura dopiranih odabranim metalnim ionima-1D-DopedFeOXMira RistićIP-2016-06-8254HRZZ
Depositing User: Sofija Konjević
Date Deposited: 11 Jan 2019 12:47
Last Modified: 11 Jan 2019 12:47
URI: http://fulir.irb.hr/id/eprint/4396
DOI: 10.5562/cca3402

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