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Elementary Reaction Kinetics of the CO/CO2/Ni/YSZ Electrode

Yurkiv, Vitaliy and Starukhin, Dzmitry and Volpp, Hans-Robert and Bessler, Wolfgang (2011) Elementary Reaction Kinetics of the CO/CO2/Ni/YSZ Electrode. Journal of The Electrochemical Society, 158 (1), B5-B10. Electrochemical Society, Inc.. doi: 10.1149/1.3505296.

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Official URL: http://dx.doi.org/10.1149/1.3505296

Abstract

Results of combined experimental and theoretical investigations of elementary chemical reaction processes of CO�CO2 gas mixtures at nickel/yttria-stabilized zirconia (Ni/YSZ) solid oxide fuel cell (SOFC) model anode systems are presented. Temperature-programmed desorption and reaction measurements were performed in order to determine adsorption/desorption kinetic data as well as thermodynamic parameters for the CO/CO2/Ni and CO/CO2/yttria-stabilized zirconia (YSZ) heterogeneous reaction systems. From these data, an elementary kinetic reaction mechanism of the electrochemical CO oxidation at Ni/YSZ anodes was developed. Numerical simulations were performed for three different spillover mechanisms. Steady-state polarization curves and electrochemical impedance spectra were calculated, allowing for a direct comparison with experiments performed by Lauvstad et al. [J. Electrochem. Soc., 149, E506 (2002)]. Best agreement with the experimental data was obtained when assuming two consecutive charge-transfer steps from YSZ�O2� via YSZ�O� to Ni�O, the second step being accompanied by oxygen spillover over the three-phase boundary.

Item URL in elib:https://elib.dlr.de/71557/
Document Type:Article
Title:Elementary Reaction Kinetics of the CO/CO2/Ni/YSZ Electrode
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Yurkiv, Vitaliyvitaliy.yurkiv (at) dlr.deUNSPECIFIED
Starukhin, Dzmitrysdz (at) pci.uni-heidelberg.deUNSPECIFIED
Volpp, Hans-Robertaw2 (at) ix.urz.uni-heidelberg.deUNSPECIFIED
Bessler, WolfgangWolfgang.Bessler (at) dlr.deUNSPECIFIED
Date:January 2011
Journal or Publication Title:Journal of The Electrochemical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:158
DOI :10.1149/1.3505296
Page Range:B5-B10
Publisher:Electrochemical Society, Inc.
Status:Published
Keywords:adsorption, carbon compounds, chemical reactions, electrochemical electrodes, electrochemical impedance spectroscopy, gas mixtures, nickel, numerical analysis, oxidation, polarisation, solid oxide fuel cells, thermally stimulated desorption, thermodynamic properties, yttrium compounds, zirconium compounds
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Yurkiv, Vitaliy
Deposited On:08 Nov 2011 11:25
Last Modified:08 Mar 2018 18:45

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