Goodwin, David G. and Zhu, Huayang and Colclasure, Andrew M. and Kee, Robert J. (2009) Modeling Electrochemical Oxidation of Hydrogen on Ni–YSZ Pattern Anodes. Journal of the Electrochemical Society, 156 (9). B1004-B1021. ISSN 0013-4651 http://resolver.caltech.edu/CaltechAUTHORS:20090808-142500969
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A computational model is developed to represent the coupled behavior of elementary chemistry, electrochemistry, and transport in the vicinity of solid-oxide fuel cell three-phase boundaries. The model is applied to assist the development and evaluation of H_2 charge-transfer reaction mechanisms for Ni–yttria-stabilized zirconia (YSZ) anodes. Elementary chemistry and surface transport for the Ni and YSZ surfaces are derived from prior literature. Previously published patterned-anode experiments [J. Mizusaki et al., Solid State Ionics, 70/71, 52 (1994)] are used to evaluate alternative electrochemical charge-transfer mechanisms. The results show that a hydrogen-spillover mechanism can explain the Mizusaki polarization measurements over wide ranges of gas-phase composition with both anodic and cathodic biases.
|Additional Information:||© 2009 The Electrochemical Society. Submitted 2 February 2009; revised 6 April 2009; published 6 July 2009. We gratefully acknowledge insightful discussions with Professor Wolfgang Bessler (University of Heidelberg and DLR, Stuttgart), Professor Olaf Deutschmann (University of Karlesruhe), Professor Greg Jackson (University of Maryland), and Dr. Graham Goldin (Ansys, Inc.) during the course of this research. The effort was supported by a DoD Research Tools Consortium (RTC) program administered by the Office of Naval Research under grant no. N00014-05-1-0339. California Institute of Technology assisted in meeting the publication costs of this article. PACS * 82.45.Fk Electrochemical electrodes * 82.47.Ed Solid-oxide fuel cells (SOFC) * 82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces * 82.45.Jn Surface structure, reactivity and catalysis (electrochemistry) * 82.30.Fi Ion-molecule, ion-ion, and charge-transfer chemical reactions|
|Subject Keywords:||charge exchange, electrochemical electrodes, hydrogen, nickel compounds, oxidation, solid oxide fuel cells, surface chemistry, yttrium compounds, zirconium compounds|
|Official Citation:||Modeling Electrochemical Oxidation of Hydrogen on Ni--YSZ Pattern Anodes David G. Goodwin, Huayang Zhu, Andrew M. Colclasure, and Robert J. Kee, J. Electrochem. Soc. 156, B1004 (2009), DOI:10.1149/1.3148331|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||George Porter|
|Deposited On:||01 Sep 2009 23:17|
|Last Modified:||26 Dec 2012 11:09|
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