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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Official URL: https://hrcak.srce.hr/211743

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 title	Project leader	Project code	Project type
Nastajanje i svojstva 1D a-Fe2O3 nanostruktura dopiranih odabranim metalnim ionima-1D-DopedFeOX	Mira Ristić	IP-2016-06-8254	HRZZ
Potpora vrhunskim istraživanjima Centra izvrsnosti za napredne materijale i senzore-	Mile Ivanda; Milko Jakšić; Mario Stipčević; Marko Kralj	KK.01.1.1.01.0001	EK

Depositing User:

Stjepko Krehula

Date Deposited:

11 Jan 2019 12:47

URI:

http://fulir.irb.hr/id/eprint/4396

DOI:

10.5562/cca3402