Performance of La0.5Sr1.5MnO4±δ Ruddlesden-Popper manganite as electrode material for symmetrical solid oxide fuel cells. Part B. the hydrogen oxidation reaction. (1st September 2020)

• Record Type: Journal Article
• Authors: Sandoval, Mónica V.; Cardenas, Carolina; Capoen, Edouard; Roussel, Pascal; Pirovano, Caroline; Gauthier, Gilles H.
• Is Part Of: Electrochimica acta. Volume 353(2020)
• Publication Date: 2020-09-01
• Subjects: Symmetrical SOFC -- Anode -- Ruddlesden-popper -- Manganite -- Electrochemical impedance spectroscopy -- Hydrogen oxidation reaction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136494
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The electrochemical performance of La0.5 Sr1.5 MnO4±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% H2 O), dry 3% H2 /Ar, and pure H2 (3% H2 O). 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. Highlights: The layered La0.5 Sr1.5 MnO4±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.