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Theoretical study of the optical and thermodynamic properties of LaxSr1−xCo1−yFeyO3−δ (x/y = 0.25, 0.5, 0.75) perovskites

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Abstract

The performance of LaxSr1−xCo1−yFeyO3−δ perovskite systems in applications such as solid oxide fuel cells and catalysis is related to the proportion of substitution atoms. Using a density functional theory method, we investigate the doping effect on the electronic, optical, and thermodynamic properties of LaxSr1−xCo1−yFeyO3−δ (x/y = 0.25, 0.5, 0.75). Our results show that La doping introduces an empty state and pushes the Fermi level upwards. The doping Fe derived states locate away from the Fermi level as compared with Co states. From the results of optical absorption, the peak at 200–300 nm is enhanced and experiences a blue-shift with increasing La concentration. The corresponding peak at 400–700 nm also shows a blue-shift induced by both La and Fe doping, and it could be enhanced by Fe doping while being suppressed by La doping. And the peak above 1500 nm is enhanced by the cooperation of La and Fe doping. From thermodynamic calculations via an Ellingham diagram, it is found that the parent SrCoO3 is the most favorable composition for releasing O2, with both La and Fe doping hampering the reduction reaction. Therefore, the optical and thermodynamic properties of LaxSr1−xCo1−yFeyO3−δ could be adjusted by special doping values.

Graphical abstract: Theoretical study of the optical and thermodynamic properties of LaxSr1−xCo1−yFeyO3−δ (x/y = 0.25, 0.5, 0.75) perovskites

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Publication details

The article was received on 04 Sep 2019, accepted on 02 Nov 2019 and first published on 04 Nov 2019


Article type: Paper
DOI: 10.1039/C9CP04921E
Phys. Chem. Chem. Phys., 2019, Advance Article

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    Theoretical study of the optical and thermodynamic properties of LaxSr1−xCo1−yFeyO3−δ (x/y = 0.25, 0.5, 0.75) perovskites

    T. Jia, P. Ohodnicki, B. Chorpening, J. Lekse, G. Hackett and Y. Duan, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP04921E

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