Magnetic ion oxidation state dependent magnetoelectric coupling strength in Fe doped BCT ceramics

Chawla, Aanchal; Singh, Anupinder; Babu, P. D.; Singh, Mandeep

doi:10.1039/d0ra00969e

Cited by 7 publications

(1 citation statement)

References 54 publications

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“…Accordingly, the increase in Fe 2+ indicates more inversion of Fe 3+ into Fe 2+ , that is, an increase in Fe 2+ at the tetrahedral sites. In this case, oxygen can easily escape from the lattice structure owing to the charge compensation effect [50], thus clarifying the increase in oxygen vacancies. Moreover, the Zn 2p spectra (Fig.…”

Section: Surface Defects Electrochemical Active Surface Area and Carr...mentioning

confidence: 88%

Defect-rich spinel ferrites with improved charge collection properties for efficient solar water splitting

Tan¹,

Jeong²,

Li³

et al. 2023

Journal of Advanced Ceramics

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Spinel zinc ferrite (ZnFe 2 O 4 , ZFO) is a potential photoanode material for photoelectrochemical (PEC) water splitting because of its ideal bandgap (1.9-2.1 eV) and superior chemical stability in aqueous solutions. However, the low charge collection efficiency significantly hinders the improvement in PEC activity. Herein, we report an ultrafast and effective flame activation route to enhance the charge collection properties of ZFO. First, high-temperature flame (> 1300 ℃) facilitated surface and grain boundary diffusions, increasing the grain size and connectivity of the ZFO nanoparticles. Second, the reducing atmosphere of the flame enabled the formation of surface defects (oxygen vacancy and Fe 2+ ), thereby increasing the charge carrier density and surface adsorption sites. Significantly, these two factors promoted charge transport and transfer kinetics, resulting in a 10-fold increase in the photocurrent density over the unactivated ZFO. Furthermore, we deposited a thin Al 2 O 3 overlayer to passivate the ZFO surface and then the NiFeO x oxygen evolution catalyst (OEC) to expedite hole injection into the electrolyte. This surface passivation and OEC deposition led to a remarkable photocurrent density of ~1 mA/cm 2 at 1.23 V versus the reversible hydrogen electrode, which is the highest value among all reported ZFO photoanodes. Notably, the NiFeO x /Al 2 O 3 /F-ZFO photoanode achieved excellent photocurrent stability over 55 h (96% retention) and superior faradaic efficiency (FE > 94%). Our flame activation method is also effective in improving the photocurrent densities of other spinel ferrites: CuFe 2 O 4 (93 times), MgFe 2 O 4 (16 times), and NiFe 2 O 4 (12 times).

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Section: Surface Defects Electrochemical Active Surface Area and Carr...mentioning

confidence: 88%

Defect-rich spinel ferrites with improved charge collection properties for efficient solar water splitting

Tan¹,

Jeong²,

Li³

et al. 2023

Journal of Advanced Ceramics

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Phase evolution and magnetoelectric coupling studies in multiferroic Fe doped BST solid solutions

et al. 2021

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Role of Eu and Fe in TiO2 for magneto-opto-electronic applications

Rehani

Saxena²,

Balal

et al. 2022

Appl. Phys. A

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Magnetic ion oxidation state dependent magnetoelectric coupling strength in Fe doped BCT ceramics

Abstract: Polycrystalline samples of Ba0.96Ca0.04Ti0.91Fe0.09O3 were prepared using a conventional solid state reaction route with different Fe starting precursors (Fe2O3, Fe3O4). A significant difference in the magnetic and ferroelectric properties was observed.

Cited by 7 publications

References 54 publications

Defect-rich spinel ferrites with improved charge collection properties for efficient solar water splitting

Defect-rich spinel ferrites with improved charge collection properties for efficient solar water splitting

Phase evolution and magnetoelectric coupling studies in multiferroic Fe doped BST solid solutions

Role of Eu and Fe in TiO2 for magneto-opto-electronic applications

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