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Journal Article

Water splitting on model-composite La0.6Sr0.4FeO3-δ (LSF) electrodes in H2/H2O atmosphere

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Rameshan,  Raffael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
University of Innsbruck, Institute of Physical Chemistry;

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Blume,  Raoul
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Abt. Solarenergieforschung, Helmhotz-Zentrum Berlin;

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Hävecker,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Abt. Solarenergieforschung, Helmhotz-Zentrum Berlin;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Opitz, A. K., Nenning, A., Kogler, S., Rameshan, C., Rameshan, R., Blume, R., et al. (2015). Water splitting on model-composite La0.6Sr0.4FeO3-δ (LSF) electrodes in H2/H2O atmosphere. ECS Transactions, 68(1), 3333-3343. doi:10.1149/06801.3333ecst.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-3B7E-E
Abstract
Mixed conducting cathodes for solid oxide electrolysis cells (SOECs) offer a promising alternative to the nowadays used Ni/YSZ cermet. Here, the water splitting kinetics of mixed conducting perovskite-type La0.6Sr0.4FeO3-δ (LSF) thin film electrodes was investigated in humid reducing atmospheres at 600 – 650 °C. Under equilibrium conditions an area specific surface resistance of ca. 15 Ωcm2 was obtained on freshly prepared electrodes. Upon cathodic polarization of more than 20 mV a strong decrease of the surface resistance was observed. This acceleration of the water splitting kinetics was accompanied by the formation of metallic iron particles on the LSF surface, which was observed by means of near-ambient pressure XPS experiments.