Interaction of Solid Electrolyte La_0.88Sr_0.12Ga_0.82Mg_0.18O_2.85
with Hydrogen, Water Vapor, and Carbon Dioxide

S. N. Shkerin^a,z, S. A. Kovyazina^b, S. M. Beresnev^a,
N. A. Kalashnikova^a, and Z. S. Martem’yanova^a

^a Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 20, Yekaterinburg, 620219 Russia
^b Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences,
Yekaterinburg, Russia

Received February 18, 2004; in final form, May 27, 2004

Abstract—The air,Au/La_0.88Sr_0.12Ga_0.82Mg_0.18O_2.85/Au,air cells are studied by an impedancemetry method
before and after a week-long exposure at 700°C to atmospheres of hydrogen, humid air, and carbon dioxide.
Blank specimens of the same electrolyte are examined by methods of x-ray diffraction, Raman scattering (RS),
and x-ray photoelectron spectroscopy. The fact that the shape of the RS spectra and the shape of the electrode
impedance dispersion alter unequivocally suggests that, at the very least, the electrode surface interacts with all
the gases. The interaction in question is reversible in the case of hydrogen and carbon dioxide. In the case of
water vapor, the interaction is irreversible.

Key words: solid electrolyte, lanthanum gallate, chemical interaction

Pleiades Publishing home page | journal home page | top

If you have any problems with this server, contact webmaster.