Original scientific paper

https://doi.org/10.5562/cca3402

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

Stjepko Krehula orcid.org/0000-0001-6956-4478 ; Division of Materials Chemistry, Ruđer Bošković Institute, P.O. Box 180, HR-10002 Zagreb, Croatia
Mira Ristić orcid.org/0000-0003-0033-9840 ; Division of Materials Chemistry, Ruđer Bošković Institute, P.O. Box 180, HR-10002 Zagreb, Croatia
Ivana Mitar orcid.org/0000-0002-0257-1283 ; Faculty of Science, University of Split, HR-21000 Split, Croatia
Chuchu Wu ; Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Xuning Li ; Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Luhua Jiang ; Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Junhu Wang ; Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Gongquan Sun ; Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Tao Zhang ; Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Marija Perović ; Condensed Matter Physics Laboratory, Institute of Nuclear Sciences “Vinca”, University of Belgrade, Belgrade, Serbia
Marko Bošković ; Condensed Matter Physics Laboratory, Institute of Nuclear Sciences “Vinca”, University of Belgrade, Belgrade, Serbia
Bratislav Antić ; Condensed Matter Physics Laboratory, Institute of Nuclear Sciences “Vinca”, University of Belgrade, Belgrade, Serbia
Svetozar Musić ; Croatian Academy of Sciences and Arts, Trg Nikole Šubića Zrinskog 11, HR-10000 Zagreb, Croatia

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.

This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

α-FeOOH; α-Fe2O3; Ni doping; XRPD; Mössbauer spectroscopy; FE-SEM; OER

Hrčak ID:

211743

URI

https://hrcak.srce.hr/211743

Publication date:

29.12.2018.

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