Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods

Popov, Nina; Bošković, Marko; Perović, Marija; Németh, Zoltán; Wang, Junhu; Kuang, Zhichong; Reissner, Michael; Kuzmann, Ernő; Homonnay, Zoltán; Kubuki, Shiro; Marciuš, Marijan; Ristić, Mira; Musića, Svetozar; Stanković, Dalibor; Krehula, Stjepko

doi:10.1016/j.jpcs.2020.109929

Pregled bibliografske jedinice broj: 1107091

Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods

Popov, Nina; Bošković, Marko; Perović, Marija; Németh, Zoltán; Wang, Junhu; Kuang, Zhichong; Reissner, Michael; Kuzmann, Ernő; Homonnay, Zoltán; Kubuki, Shiro et al.

Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods // Journal of physics and chemistry of solids, 152 (2021), 109929-109944 doi:10.1016/j.jpcs.2020.109929 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 1107091 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods

Autori
Popov, Nina ; Bošković, Marko ; Perović, Marija ; Németh, Zoltán ; Wang, Junhu ; Kuang, Zhichong ; Reissner, Michael ; Kuzmann, Ernő ; Homonnay, Zoltán ; Kubuki, Shiro ; Marciuš, Marijan ; Ristić, Mira ; Musića, Svetozar ; Stanković, Dalibor ; Krehula, Stjepko

Izvornik
Journal of physics and chemistry of solids (0022-3697) 152 (2021); 109929-109944

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Hematite ; Nanorods ; Low-spin Co3+ ; Morin transition ; Mössbauer spectroscopy

Sažetak
Pure hematite nanorods and very long and thin cobalt-doped hematite nanorods (nanoneedles) were prepared by a combined precipitation and annealing method. The influence of the level of cobalt doping on different properties of hematite nanorods was investigated. Incorporation of cobalt in the form of low-spin Co3+ ions into the structure of hematite by substitution for high-spin Fe3+ ions was proved by determination of a significant unit cell contraction by powder X-ray diffraction (PXRD) and characteristic positions of the absorption edge in X-ray absorption near edge structure (XANES) spectra and peaks in X-ray emission (XES) spectra. Cobalt doping caused a gradual elongation and thinning of hematite nanorods – very long and thin 1D nanoparticles (nanoneedles) were formed in the presence of 10 and 12 mol% Co. Magnetic measurements showed a strong increase in low-temperature remanent magnetization and coercivity upon cobalt doping, as well as a disappearance of the Morin transition, which was also confirmed by Mössbauer spectroscopy. Cobalt doping significantly affected optical properties of hematite nanorods – absorption in the visible and NIR ranges increased, which was accompanied by narrowing of the optical band gap. Compared with pure hematite nanorods cobalt-doped hematite nanoneedles showed a significantly better electrocatalytic activity for the oxygen evolution reaction (OER).

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA

Projekti:
HRZZ-IP-2016-06-8254 - Nastajanje i svojstva 1D α-Fe2O3 nanostruktura dopiranih odabranim metalnim ionima (1D-DopedFeOX) (Krehula, Stjepko; Ristić, Mira, HRZZ ) ( CroRIS)

Ustanove:
Institut "Ruđer Bošković", Zagreb

Profili:

Marijan Marciuš (autor)