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A Degradation Model for Solid Oxide Fuel Cell Anodes Due to Impurities in Coal Syngas: Part II Estimation of Tolerance Limits
Author(s) -
Cayan F. N.,
Sezer H.,
Celik I.
Publication year - 2016
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201500056
Subject(s) - arsine , syngas , anode , coal , impurity , materials science , extrapolation , cathode , stack (abstract data type) , vaporization , electrolyte , solid oxide fuel cell , oxide , volatilisation , chemical engineering , degradation (telecommunications) , nuclear engineering , analytical chemistry (journal) , chemistry , catalysis , electrode , phosphine , metallurgy , chromatography , organic chemistry , electrical engineering , computer science , mathematical analysis , mathematics , programming language , engineering
An engineering analysis based on calibrated numerical predictions was performed to estimate the minimum allowable impurity concentrations in coal syngas intended to be used in Solid Oxide Fuel Cells (SOFCs) operating for over 10,000 h. Arsine and phosphine, impurities that are known to have the most deleterious effects on the cell performance due to their affinity to have strong relations with the anode catalyst by formation of secondary phases, were investigated. Time to failure was taken as the operation time when 60% performance loss is incurred, estimated by the previously developed one‐dimensional degradation model. Limiting concentrations were determined for arsine and phosphine fuel contaminants for electrolyte and anode supported SOFCs. Predicted lifetimes for single cells can provide a basis for estimation of SOFC stack lifetimes operating on coal syngas. Extrapolation of results from the numerical simulations based on accelerated laboratory tests at relatively higher concentrations can provide guidance into predicting the cell failure at low impurity concentrations.