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Titolo:
Identification of the reaction mechanism of the Pt, O-2(g)vertical bar yttria-stabilized zirconia system - Part II: Model implementation, parameter estimation, and validation
Autore:
Mitterdorfer, A; Gauckler, LJ;
Indirizzi:
ETHich,ich, Swiss Fed Inst Technol, Dept Mat, Chair Nonmet Mat, CH-8092 Zur ETH Zurich Zurich Switzerland CH-8092 Mat, Chair Nonmet Mat, CH-8092 Zur
Titolo Testata:
SOLID STATE IONICS
fascicolo: 3-4, volume: 117, anno: 1999,
pagine: 203 - 217
SICI:
0167-2738(199902)117:3-4<203:IOTRMO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
PT(111) SURFACE; ELECTRODE POLARIZATION; PLATINUM-ELECTRODES; OXYGEN-ADSORPTION; DESORPTION; RESISTANCE; IMPEDANCE; INTERFACE; STICKING; KINETICS;
Keywords:
electrochemical kinetics; electrochemical impedance spectroscopy (EIS); state-space model; MATLAB/SIMULINK; oxygen adsorption;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Gauckler, LJ ETHich,ich, Swiss Fed Inst Technol, Dept Mat, Chair Nonmet Mat, CH-8092 Zur ETH Zurich Zurich Switzerland CH-8092 nmet Mat, CH-8092 Zur
Citazione:
A. Mitterdorfer e L.J. Gauckler, "Identification of the reaction mechanism of the Pt, O-2(g)vertical bar yttria-stabilized zirconia system - Part II: Model implementation, parameter estimation, and validation", SOL ST ION, 117(3-4), 1999, pp. 203-217

Abstract

In order to find the kinetic parameters of porous Pt, O-2(g)\yttria-stabilized zirconia electrodes, electrochemical impedance spectra were obtained at T=1071 K and 975 K in the p(O2) range of (1...10(-4)) atm. A numerical optimization technique was employed to estimate the unknown kinetic parameters of the reaction model examined in part I of the present paper. The exchange coefficient beta, the rate constants for the electron transfer k(1), foroxygen adsorption k(a), for oxygen desorption k(d), and the Fickian surface diffusion coefficient D(theta) of atomic oxygen on polycrystalline Pt were estimated at T=975 K and p(O2)=1 atm. The results were validated in termsof the proposed model. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 21/09/20 alle ore 05:47:00