Boosted electrochemical performance of ca‐cobaltite‐based composite electrodes for reversible solid oxide cells

Summary In this article, the electrode performance of the misfit‐layered calcium cobaltite (C349), as cathode for solid oxide fuel and anode for solid oxide electrolysis cell (SOEC), is analysed by electrochemical impedance spectroscopy using a 3‐probe cell configuration. The addition of Ce0.8Gd0.2O...

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Bibliographic Details
Published in:International journal of energy research 2022-12, Vol.46 (15), p.22070-22077
Main Authors: Araújo, Allan J. M., Loureiro, Francisco J. A., Holz, Laura I. V., Graça, Vanessa C. D., Grilo, João P. F., Macedo, Daniel A., Paskocimas, Carlos A., Fagg, Duncan P.
Format: Article
Language:English
Subjects:
Analytical methods
Anodes
anodic polarisation
Anodic polarization
Calcium
calcium cobaltite
Cathodes
cathodic polarisation
Current density
Electrical measurement
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Electrode polarization
Electrodes
Electrolysis
Electrolytic cells
impedance spectroscopy
Microstructure
oxygen electrode
Performance enhancement
Polarization
reversible solid oxide cell
Spectroscopy
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Summary:Summary In this article, the electrode performance of the misfit‐layered calcium cobaltite (C349), as cathode for solid oxide fuel and anode for solid oxide electrolysis cell (SOEC), is analysed by electrochemical impedance spectroscopy using a 3‐probe cell configuration. The addition of Ce0.8Gd0.2O2−δ (CGO20) as a composite electrode phase significantly boosts the electrochemical processes, decreasing the polarisation resistance (Rp) by approximately half an order of magnitude over the studied temperature range (550°C‐700°C). Electrical measurements under cathodic and anodic polarisation indicate that the C349/CGO20 composite is a promising oxygen electrode for reversible solid oxide cells with enhanced performance when operated as a SOEC anode. Short‐term stability testing of 50 h, under anodic polarisation at 700°C, demonstrates a stable current density with no observable microstructure delamination after measurements, being promising to avoid common degradation issues during SOEC operation. The electrode performance of the misfit layered calcium cobaltite (C349) with the addition of gadolinium‐doped ceria as oxygen composite electrode for reversible solid oxide cells is studied, showing an enhanced performance when operated as a solid oxide electrolyser cell anode.
ISSN:0363-907X
1099-114X
DOI:10.1002/er.8174