High temperature cyclic voltammetry of Pt catalyst-electrodes in solid electrolyte cells
1993; Elsevier BV; Volume: 38; Issue: 17 Linguagem: Inglês
10.1016/0013-4686(93)80149-t
ISSN1873-3859
AutoresYi Jiang, Anthony Kaloyannis, C.G. Vayenas,
Tópico(s)Advancements in Solid Oxide Fuel Cells
ResumoCyclic voltammetry was used in conjunction with steady-state current—overpotential measurements to investigate the chemisorptive and charge-transfer properties of porous Pt catalyst films also used as electrodes in 8 mol% Y2O3 stabilized-zirconia (YSZ) solid electrolyte cells at temperatures between 350 and 650°C and oxygen pressure of 1–105 Pa. The results can be interpreted within the theory of cyclic voltammetry for aqueous systems and provide useful information both about the charge transfer reactions at the three-phase boundaries Pt—YSZ—gas and also about the chemisorptive properties of the gas-exposed Pt electrode surface. Two types of oxygen are found to exist on the gas-exposed Pt surface: dissociatively chemisorbed oxygen and oxidic oxygen. The latter may be related to the recently found effect of non-faradaic electrochemical modification of catalytic activity (NEMCA).
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