Oxygen Reactions at the Interface of Nonstoichiometric Fluorides LaF3 and CeF3 with Chemically Modified Electrodes |
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Authors: | Urchukova M M Kot S A Turaeva M S Murin I V |
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Institution: | (1) Chemical Faculty, St. Petersburg State University, Universitetskii pr. 2, St. Petersburg, 198904, Russia;(2) Research Institute of Agrophysics, Russian Academy of Agricultural Sciences, Grazhdanskii pr. 14, St. Petersburg, 195220, Russia |
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Abstract: | The oxygen reaction at the interface LaF3(CeF3)|electrode,O2(g) is studied in air on Pt and C electrodes and electrodes modified by supported oxides of Co, Sr, and/or La on C, Si, or Pt substrates. The experimental methods used are voltammetry with a linear potential change and stripping voltammetry and cyclic voltammetry. The voltammetric response is dependent on the nature of solid electrolyte and electrode, the balance between the substrate and active agent, and on the conditions of thermal treatment of electrodes. Mobile oxygen forms are discovered at interfaces CeF3|C (Co
x
O
y
), 2 (C] : Co] = 1 : 10, 1 : 20); CeF3|C (Co
x
O
y
), 2(C] : Co] = 1 : 10); and CeF3|Pt (Co
x
O
y
), O2(Pt] : Co] = 1 : 40). The peak current I
pa in the anodic curves increases with extending the limit of cathodic potential scan E
rc. The peak current I
pc in the cathodic curves increases with extending the limit of anodic potential scan E
ra. |
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Keywords: | |
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