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    On the Predictions of Carbon Deposition on the Nickel Anode of a SOFC and Its Impact on Open-Circuit Conditions

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    Type
    Article
    Authors
    Lee, W. Y.
    Hanna, J.
    Ghoniem, A. F.
    KAUST Grant Number
    KUS-11-010-01
    Date
    2012-12-04
    Online Publication Date
    2012-12-04
    Print Publication Date
    2012-12-04
    Permanent link to this record
    http://hdl.handle.net/10754/599066
    
    Metadata
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    Abstract
    Previous thermodynamic analyses of carbon formation in SOFCs assumed that graphite could be used to represent the properties of carbon formed in the anode. It is generally observed, however, that catalytically grown carbon nanofibers (CNF) are more likely to form in the SOFC anode with nickel catalysts. The energetic and entropic properties of CNF are different from those of graphite.We compare equilibrium results based on thermochemical properties for graphite, to new results based on a previously reported value of an empirically determined Gibbs free energy for carbon fibers grown on a nickel support (with fitted values of H°CNF = 54.46 kJ/mol and S°CNF = 68.90 J/mol/K for a nickel crystal size of 5.4 nm). There is little difference in predictions of carbon formation under open-circuit conditions between the two carbon types for methane mixtures, with graphite predicted to form at lower temperatures than CNF. There is a much bigger difference in predictions for methanol mixtures, especially at low steam-carbon ratios. The differences for propane are even more pronounced, and the improved predictions assuming CNF are in closer agreement with past observations.We show a strong dependence of CNF formation and "coking threshold" on nickel crystallite size, supporting previous reports that the nickel particle size is a dominating parameter for controlling filament growth. If both carbon types are included in the calculations, only the thermodynamically favored form (i.e., the type having the lowest formation energy) exists. Predicted Nernst potentials are more-or-less independent of the carbon type and in agreement with measured open-circuit voltages. © 2012 The Electrochemical Society.
    Citation
    Lee WY, Hanna J, Ghoniem AF (2012) On the Predictions of Carbon Deposition on the Nickel Anode of a SOFC and Its Impact on Open-Circuit Conditions. Journal of the Electrochemical Society 160: F94–F105. Available: http://dx.doi.org/10.1149/2.051302jes.
    Sponsors
    This work has been supported by an award from King Abdullah University of Science and Technology, grant number KUS-11-010-01, and a grant from the Tsinghua-Cambridge-MIT Low Carbon Energy University Alliance.
    Publisher
    The Electrochemical Society
    Journal
    Journal of the Electrochemical Society
    DOI
    10.1149/2.051302jes
    ae974a485f413a2113503eed53cd6c53
    10.1149/2.051302jes
    Scopus Count
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