Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7739728 | Journal of Power Sources | 2013 | 6 Pages |
Abstract
Pore-free microelectrodes (20-100 μm diameter, 100 nm thick) of mixed-conducting perovskites are prepared on dense pellets of Y-doped BaZrO3 (4-15% Y) as proton-conducting electrolyte. The oxygen reduction reaction is investigated in gas-symmetric cells using AC impedance spectroscopy. The electronic resistance owing to the non-negligible hole conductivity of acceptor-doped BaZrO3 in oxidizing atmosphere can - even though much larger than the ionic resistance - be much lower than the resistance of the oxygen exchange reaction. This results in a substantial impact of electronic leakage current on the impedance spectroscopic investigations of the oxygen reduction process. Solutions to this problem are demonstrated. The impact of this effect for porous electrodes is discussed.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Daniel Poetzsch, Rotraut Merkle, Joachim Maier,