Abstract
The double perovskite oxide Dy2CoMnO6 (DCMO) has been synthesized by the sol‒gel citrate method in the form of nanoparticles with an average particle size of 110 ± 5 nm as obtained from TEM measurement. The Rietveld refinement of the X-ray diffraction (XRD) pattern suggests monoclinic P21/n crystal structure. The band gap of the material of 1.93 eV is obtained from the UV–vis diffuse reflectance spectrum. The X-ray photoemission spectroscopic study reveals the multiple oxidation states of Co and Mn in DCMO. The photocatalytic behavior of DCMO is evaluated by the photodegradation of rhodamine-B (Rh-B) under the visible light irradiation. The results indicate that DCMO nanoparticles exhibit remarkable photocatalytic efficiency by degrading the Rh-B almost 98% in 4 h. The Mott–Schottky experiment suggests the p-type semiconducting nature of DCMO. We have also schematically represented the possible photocatalytic reaction with the band edge positions of DCMO with respect to the reactive oxygen species formation potential. The electrical properties and the charge carrier dynamics of the material are investigated using the alternating current impedance spectroscopy in a wide range of temperature and frequency. The activation energy of 0.31 eV obtained from the temperature dependence Dc conductivity suggests the p-type polaronic conduction in DCMO.
Highlights
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The phase pure Dy2CoMnO6 nanostructured material is successfully synthesized by the sol–gel process.
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The Rh-B degradation efficiency of the material reaches 98% in 4 h under visible light.
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XPS study reveals multiple oxidation state of Co and Mn in DCMO.
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Mott–Schottky experiment suggests the p-type semiconducting nature of DCMO.
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Study of electrical properties also reveals p-type polaronic conduction in DCMO.
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Acknowledgements
RM (Reg. No. IF160046) acknowledges Department of Science and Technology for providing the financial support through Inspire Fellowship and SS gratefully acknowledges University Grants Commission, New Delhi for providing financial assistance in form of Dr. D. S. Kothari Postdoctoral Fellowship with award letter no. F.4-2/2006 (BSR)/PH/16-17/0026. AD thanks CSIR, New Delhi for providing the financial support in the form of SRA under the Grant No. 13(9099-A)/2020-Pool.
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Chanda, S., Maity, R., Saha, S. et al. Double perovskite nanostructured Dy2CoMnO6 an efficient visible-light photocatalysts: synthesis and characterization. J Sol-Gel Sci Technol 99, 600–613 (2021). https://doi.org/10.1007/s10971-021-05605-y
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DOI: https://doi.org/10.1007/s10971-021-05605-y