Oxygen isotope exchange between the gas-phase and the electrochemical cell O2, Pt | YSZ | Pt, O2 under conditions of applied potential difference

• Published in: Russian journal of electrochemistry 2017-08, Vol.53 (8), p.838-845
• Main Authors: Khodimchuk, A. V., Anan’ev, M. V., Eremin, V. A., Tropin, E. S., Farlenkov, A. S., Porotnikova, N. M., Kurumchin, E. Kh, Bronin, D. I.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Electrochemistry; Electrodes; Oxygen; Physical Chemistry; Yttria-stabilized zirconia; Yttrium oxide; Zirconium dioxide
• ISSN: 1023-1935; 1608-3342
• DOI: 10.1134/S1023193517080109

The kinetics of oxygen isotope exchange between gas-phase oxygen and the electrochemical cell O 2 , Pt | ZrO 2 + 10 mol % Y 2 O 3 (YSZ) | Pt, O 2 with applied potential difference (Δ U = ±1.2 V) is studied in the temperature range of 600–800°С and the oxygen pressure interval of 3–13 kPa. An original design of a vacuum electrochemical cell with the separated gas space is put forward for studying how the potential difference on the electrochemical cell influences the kinetics of interaction of gas-phase oxygen with the gas electrode O 2 , Pt | YSZ in the electrochemical cell. It is shown that the oxygen interphase exchange rate is the higher the more negative the charge on the electrode studied; moreover, the mechanism of gas-phase oxygen exchange with the gas electrode O 2 , Pt | YSZ in the electrochemical cell depends fundamentally on the electrode charge sign. The possible reasons for the revealed differences are discussed; the corresponding models are proposed.