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Thermogravimetric and Electrocatalytic Study of Carbon Deposition of Ag‐doped Ni/YSZ Electrodes under Internal CH 4 Steam Reforming Conditions
Author(s) -
Gavrielatos I.,
Montinaro D.,
Orfanidi A.,
Neophytides S. G.
Publication year - 2009
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.200800181
Subject(s) - thermogravimetric analysis , yttria stabilized zirconia , materials science , catalysis , anode , inorganic chemistry , carbon fibers , nickel , electrode , chemical engineering , chemistry , metallurgy , composite material , organic chemistry , cubic zirconia , ceramic , composite number , engineering
The effect of Ag addition on Ni/YSZ Carbon tolerance was studied by means of thermogravimetric, catalytic and electrocatalytic experiments. Ni/YSZ activity towards C deposition can be significantly decreased by adding 1 to 5 at.‐% (atomic ratio) Ag with respect to Ni. It was found that the activation energy of CH 4 dissociation was increased from 61 kJ mol –1 on Ni/YSZ to 137 kJ mol –1 on Ni(5Ag)/YSZ. The electrode was significantly improved with regard to its C tolerance, even at a methane to water ratio as high as 4.35, at temperatures ranging between 923–1,023 K. At higher temperature most probably due to Ag evaporation from Ag‐doped Ni/YSZ surface, a severe anode catalytic and electrocatalytic activity degradation was observed.