High temperature cyclic voltammetry of Pt catalyst-electrodes in solid electrolyte cells
✍ Scribed by Jiang Yi; Anthony Kaloyannis; Constaintinos G. Vayenas
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 712 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0013-4686
No coin nor oath required. For personal study only.
✦ Synopsis
Abstraet+clic 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% Y,O, stabilii-xirconia (YSZ) solid electrolyte cells at temperatures between 350 and 650°C and oxygen pressures of l-10' 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).