Performance of La0.5Sr1.5MnO4±δ Ruddlesden-Popper manganite as electrode material for symmetrical solid oxide fuel cells. Part B. the hydrogen oxidation reaction

The electrochemical performance of La0.5Sr1.5MnO4±δ (L5S15M) in reducing atmosphere was investigated using Electrochemical Impedance Spectroscopy (EIS) measurements on Au/L5S15M/GDC/YSZ/GDC/L5S15M/Au symmetrical cell. In this research, the electrochemical performance of symmetrical cells sintered at...

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Bibliographic Details
Published in:Electrochimica acta 2020-09, Vol.353, p.136494, Article 136494
Main Authors: Sandoval, Mónica V., Cardenas, Carolina, Capoen, Edouard, Roussel, Pascal, Pirovano, Caroline, Gauthier, Gilles H.
Format: Article
Language:English
Subjects:
Anode
Chemical Sciences
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrode materials
Electrode polarization
Electrodes
Frequency response
Hydrogen oxidation reaction
Manganite
Oxidation
Reducing atmospheres
Ruddlesden-popper
Sintering
Solid oxide fuel cells
Surface diffusion
Symmetrical SOFC
Yttria-stabilized zirconia
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Summary:The electrochemical performance of La0.5Sr1.5MnO4±δ (L5S15M) in reducing atmosphere was investigated using Electrochemical Impedance Spectroscopy (EIS) measurements on Au/L5S15M/GDC/YSZ/GDC/L5S15M/Au symmetrical cell. In this research, the electrochemical performance of symmetrical cells sintered at different temperatures cells was evaluated in various reducing atmospheres: 3% H2/Ar (3% H2O), dry 3% H2/Ar, and pure H2 (3% H2O). The lowest values for the area specific resistance (ASR) were acquired for the L5S15M electrode sintered at 1150 °C. For the hydrogen oxidation reaction, three rate limiting processes were identified and for all the electrode elaboration conditions, the low frequency response assigned to surface diffusion represents the highest contribution to the total polarization resistance. •The layered La0.5Sr1.5MnO4±δ manganite is studied as SOFC anode.•The sintering temperature strongly influences the electrochemical properties.•The lowest ASR values are obtained for L5S15M electrode sintered at 1150 °C.•Three rate limiting processes are identified for the hydrogen oxidation reaction.•Adsorbed H surface diffusion is identified as the slowest step of electrode process.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2020.136494