Abstract
MIEC (Mixed Ionic Electronic Conductors) used as oxygen electrodes in Solid Oxide Cells are characterized by both high oxygen diffusion (D) and surface exchange (k) coefficients. To date, the reported measurements have been performed at ambient pressure and even below. However, to reach a higher efficiency at the system level, it would be helpful to operate the Solid Oxide Electrolysers under high pressure. A preliminary study is therefore mandatory, to assess the oxygen reduction/oxidation and the transport properties of the electrodes materials when submitted to high pressure. Then, an innovative setup able to operate up to a total pressure of 50 bar has been developed. Its technical characteristics will be described here. This setup has been used to characterize the properties of nickelates with MIEC properties. Oxygen exchanges have been performed in the range 500 < T°C < 700, under p(O2) ~ 6.5 bars. Preliminary results (oxygen over-stoichiometry, D* and k* coefficients) obtained on Ln2NiO4+ d (Ln=La, Pr, Nd) oxides are presented and discussed.
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