Physical and photo-electrochemical properties of the spinel SrFe2O4: application to hydrogen production under visible light

SrFe 2 O 4 prepared by sol–gel method after annealing at 800 °C crystallizes in a normal spinel structure. The structural, morphological, magnetic, optical, transport, and photo-electrochemical properties were systematically investigated. The sol–gel permits to have nanocrystallites with an average...

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Veröffentlicht in:Journal of materials science. Materials in electronics 2022-05, Vol.33 (13), p.9976-9987
Hauptverfasser: Attia, S., Helaili, N., Rekhila, G., Bessekhouad, Y., Trari, M.
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container_issue 13
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creator Attia, S.
Helaili, N.
Rekhila, G.
Bessekhouad, Y.
Trari, M.
description SrFe 2 O 4 prepared by sol–gel method after annealing at 800 °C crystallizes in a normal spinel structure. The structural, morphological, magnetic, optical, transport, and photo-electrochemical properties were systematically investigated. The sol–gel permits to have nanocrystallites with an average size of ~ 30 nm. The UV–Visible diffuse reflectance analysis gives a direct transition of 1.80 eV, resulting from the Fe 3+ : 3d orbital splitting in octahedral site. Such degeneracy lifting into (t 2g –e g ) levels is properly matched to the sun spectrum. The capacitance–potential (C −2  −  E ) characteristic of SrFe 2 O 4 plotted in basic electrolyte (KOH 0.1 M) exhibits p -type comportment with a flat band potential of ( E fb ) of 0.01 V SCE , a holes density ( N A ) of 1.4 × 10 15  cm −3 , and an extended space charge region of 0.9 µm. The electrochemical impedance spectroscopy exhibits a semicircle characteristic of the charge transfer whose diameter decreases under irradiation, thus supporting the semiconducting character of SrFe 2 O 4 . The electrons in the conduction band (− 1.70 V) have a high reducing ability and cathodically positioned with respect to the H 2 O/H 2 level, thus producing H 2 evolution under visible light illumination with a concomitant oxidation of SO 3 2− /S 2 O 6 2− . The best activity occurs at pH ~ 11 with H 2 evolution rate of 35 μmol mn −1  g −1 and a quantum yield of 1.8% under visible light (29 mW cm −2 ).
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The structural, morphological, magnetic, optical, transport, and photo-electrochemical properties were systematically investigated. The sol–gel permits to have nanocrystallites with an average size of ~ 30 nm. The UV–Visible diffuse reflectance analysis gives a direct transition of 1.80 eV, resulting from the Fe 3+ : 3d orbital splitting in octahedral site. Such degeneracy lifting into (t 2g –e g ) levels is properly matched to the sun spectrum. The capacitance–potential (C −2  −  E ) characteristic of SrFe 2 O 4 plotted in basic electrolyte (KOH 0.1 M) exhibits p -type comportment with a flat band potential of ( E fb ) of 0.01 V SCE , a holes density ( N A ) of 1.4 × 10 15  cm −3 , and an extended space charge region of 0.9 µm. The electrochemical impedance spectroscopy exhibits a semicircle characteristic of the charge transfer whose diameter decreases under irradiation, thus supporting the semiconducting character of SrFe 2 O 4 . The electrons in the conduction band (− 1.70 V) have a high reducing ability and cathodically positioned with respect to the H 2 O/H 2 level, thus producing H 2 evolution under visible light illumination with a concomitant oxidation of SO 3 2− /S 2 O 6 2− . 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The structural, morphological, magnetic, optical, transport, and photo-electrochemical properties were systematically investigated. The sol–gel permits to have nanocrystallites with an average size of ~ 30 nm. The UV–Visible diffuse reflectance analysis gives a direct transition of 1.80 eV, resulting from the Fe 3+ : 3d orbital splitting in octahedral site. Such degeneracy lifting into (t 2g –e g ) levels is properly matched to the sun spectrum. The capacitance–potential (C −2  −  E ) characteristic of SrFe 2 O 4 plotted in basic electrolyte (KOH 0.1 M) exhibits p -type comportment with a flat band potential of ( E fb ) of 0.01 V SCE , a holes density ( N A ) of 1.4 × 10 15  cm −3 , and an extended space charge region of 0.9 µm. The electrochemical impedance spectroscopy exhibits a semicircle characteristic of the charge transfer whose diameter decreases under irradiation, thus supporting the semiconducting character of SrFe 2 O 4 . The electrons in the conduction band (− 1.70 V) have a high reducing ability and cathodically positioned with respect to the H 2 O/H 2 level, thus producing H 2 evolution under visible light illumination with a concomitant oxidation of SO 3 2− /S 2 O 6 2− . The best activity occurs at pH ~ 11 with H 2 evolution rate of 35 μmol mn −1  g −1 and a quantum yield of 1.8% under visible light (29 mW cm −2 ).</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s10854-022-07989-1</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0002-5988-7692</orcidid></addata></record>
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subjects Characterization and Evaluation of Materials
Charge transfer
Chemistry and Materials Science
Conduction bands
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrolytes
Hydrogen
Hydrogen evolution
Hydrogen production
Light
Magnetic properties
Materials Science
Morphology
Optical and Electronic Materials
Optical properties
Oxidation
Photocatalysis
Sol-gel processes
Space charge
Spinel
title Physical and photo-electrochemical properties of the spinel SrFe2O4: application to hydrogen production under visible light
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