Oxygen electrode reaction on stabilized zirconia under high oxygen pressure (up to 100 bar)

The polarization resistance of various electrode materials on stabilized zi rconia has been measured, using impedance spectroscopy, at oxygen pressures ranging from 1 to 100 bar. Two metallic deposits have been tested: a metal dissolving no oxygen, i.e. platinum, and a metal dissolving high oxygen co ntent, i.e. silver. The results are interpreted in terms of oxide formation . The behavior of an oxide with perovskite structure (doped lanthanum manga nite) is interpreted by a change of the stoichiometric ratio at high oxygen pressure. (C) 2000 Elsevier Science B.V. All rights reserved.