Journal
JOURNAL OF POWER SOURCES
Volume 438, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.226996
Keywords
Energy conversion; Reversible solid oxide cells; Proton conductors; Misfit layered phases; Long-term stability; DRT analysis
Funding
- Government of the Russian Federation [02.A03.21.0006]
- Council of the President of the Russian Federation [CH-161.2018.1]
- Russian Foundation for Basic Research [19-58-45004]
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Reversible solid oxide cells (rSOCs) based on proton-conducting electrolytes represent an advanced electrochemical technology aimed at reversible energy conversion. Their high levels of efficiency, minimal impact on the environment and economic viability point to a positive future for rSOCs. In this study we present the results of electrochemical characterization of the Ca3Co4O9+delta-based oxygen (or steam) electrodes for rSOCs with the BaCe0.5Zr0.3Y0.2O3-delta electrolyte. The electrodes developed display excellent electrochemical activity both in the symmetrical and reversible cells. In detail, the electrode polarization resistance at 700 degrees C amounts to less than 0.25 Omega cm(2) after long-term measurements (1500 h, symmetrical cell mode of operation) and lower than 0.13 Omega cm(2) (open circuit voltage mode of operation), exceeding the electrode performances of other Co-based materials of 112 (LnBaCo(2)O(5+delta), Ln is the lanthanide) and 114 (YBaCo4O7+delta) families. Analysis of these data shows that Ca3Co4O9+delta can be considered to be a promising alternative to the state-of-the-art electrodes utilized in protonic ceramic fuel and electrolysis cells.
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