Abstract
The mixed conductive perovskite La1−xCaxFeO3−δ (LCF) exhibits high oxygen permeability. For further improvement of the oxygen permeability as well as the chemical stability, this study investigates the impact of the doping elements on the perovskite B-site. The cobalt (Co) doping of the LCF improved both the oxygen diffusion and the oxygen surface exchange. However, the oxygen semi-permeation flux of the Co-doped LCF sample was not stable at high temperatures under the high oxygen partial pressure difference (air/argon). The magnesium (Mg) doping in the B-site significantly improved the chemical stability of the LCF membranes, with the oxygen semi-permeation performances close to those obtained with the Co-doped LCF membranes. Thus, the Mg-doped LCF presented the best compromise between chemical stability and oxygen semi-permeation performance, which is applicable to the oxygen transport membranes or the cathodes in solid oxide fuel cells.
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The datasets generated during and/or analyzed during the current study are available from the second author or the corresponding author on reasonable request.
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Acknowledgments
This work was partially supported by Nagoya Kougyoukai and funds from JSPS KAKENHI Grant Number: 17H03391.
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This work was partially supported by Nagoya Kougyoukai and funds from JSPS KAKENHI Grant Number: 17H03391.
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Minami, S., Geffroy, PM., Kagomiya, I. et al. Chemical stability and oxygen transport properties of La1−xCaxFe1−yByO3−δ (with B = Co, Ni, Mg) perovskite membranes. Journal of Materials Research 36, 1241–1249 (2021). https://doi.org/10.1557/s43578-021-00212-7
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DOI: https://doi.org/10.1557/s43578-021-00212-7