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Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs
Author(s) -
Ramos T.,
Veltzé S.,
Sudireddy B. R.,
Jørgensen P. S.,
Theil Kuhn L.,
Holtappels P.
Publication year - 2014
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.201400013
Subject(s) - electrolyte , anode , cathode , materials science , electrochemistry , degradation (telecommunications) , chemical engineering , nuclear chemistry , electrode , chemistry , electrical engineering , engineering
Electrolyte supported cells (ESC), with Sc 2 O 3 ‐stabilized ZrO 2 (ScSZ) electrolytes, Gd‐doped ceria (CGO) or M/CGO (M = Ni, Ru) infiltrated Sr 0.94 Ti 0.9 Nb 0.1 O 3 (STN94) anodes and LSM/YSZ cathodes, were evaluated for their initial performance and long‐term stability. Power density for the Ru/CGO infiltrated cell reached ∼0.7 W cm –2 at 850 °C, 4% H 2 O/H 2 , whereas the Ni/CGO infiltrated cell reached ∼0.3 W cm –2 , with the current morphologies and loadings. Operation at 0.125 A cm –2 , 850 °C, feeding 50% H 2 O/H 2 to the anode and air to the cathode, for a period >300 h, showed superior stability for the Ru/CGO infiltrated cell, with ∼0.04 mV h –1 degradation rate, when compared to the Ni/CGO infiltrated cell (∼0.5 mV h –1 ). For the Ni/CGO case, the observed degradation has been tentatively linked to initial changes in the electrochemical active area and long‐term detrimental interactions between components.