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The electrochemical behavior of Pt/YSZ electrodes in oxygen containing atmosphere at 450 A degrees C has been investigated by double-step chronoamperometry and programmed linear sweep cyclic voltammetry. The response of the O-2(g),Pt/YSZ system in these experiments could be separated into a time dependent and a steady state contribution, the former being dominated by pseudocapacitive processes. It is proposed that Pt-O type species were stored via different processes at three different locations in the O-2(g),Pt/YSZ system: (1) Build-up of a platinum oxide monolayer at the Pt/YSZ binary interface. (2) Formation of Pt-O species at the triple phase boundary and their spreading-out along the Pt/gas interface. (3) Growth of the platinum oxide layer from the binary Pt/YSZ interface toward the bulk of the platinum electrode.
Jan Van Herle, Suhas Nuggehalli Sampathkumar, Khaled Lawand, Zoé Mury
Jan Van Herle, Stefan Diethelm, Guillaume Jeanmonod, Philippe Aubin, Suhas Nuggehalli Sampathkumar, Maria del Mar Perez Fortes, David Constantin
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