Abstract
The electrochemical cells with electrodes based on La0.8Sr0.2MnO3 (LSM) and supporting solid electrolytes La0.88Sr0.12Ga0.82Mg0.18O2.85 (LSGM) and Ce0.80Sm0.20O1.90 (SDC) were studied comparatively. Characteristics of LSM electrodes and composite electrodes comprising a mixture of LSM and electrolytes of different origins [LSGM, SDC, and Zr0.82Sc0.18O1.91 (SSZ) in the mass ratio of 1:1] were analyzed. It was shown that: 1) the electrode polarization conductivity and the ohmic resistance of the cells with the LSM–LSGM composite electrodes on the LSGM and SDC electrolytes had very similar values, while they were largely different from all the other electrodes, 2) the electrochemical activity of the electrodes on the SDC electrolyte was much higher than on the LSGM electrolyte, and 3) the ohmic resistance of the cells with the SDC electrolyte corresponded to the electrolyte resistance, whereas, the ohmic resistance of the cells with the LSGM electrolyte was much larger than the electrolyte resistance. The obtained results are due to the interaction between the LSM and LSM-containing electrodes with the LSGM electrolyte during sintering, leading to the formation of a product with a very low conductivity.
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Acknowledgements
The authors wish to thank the Russian Foundation for Basic Research for the financial support of Project No. 04-03-96084, under which this study was performed. They are grateful to Z. Martemyanova for her XRD assistance, to A. Pankratov for his help in obtaining SEM images, and especially to Alex Pickering for her assistance in critically reading the manuscript.
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Bronin, D.I., Kuzin, B.L., Yaroslavtsev, I.Y. et al. Behavior of manganite electrodes in contact with LSGM electrolyte: the nature of low electrochemical activity. J Solid State Electrochem 10, 651–658 (2006). https://doi.org/10.1007/s10008-006-0128-9
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DOI: https://doi.org/10.1007/s10008-006-0128-9