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Strontium‐ and Manganese‐Doped Lanthanum Gallate as a Potential Anode Material for Intermediate‐Temperature Solid Oxide Fuel Cells
Author(s) -
Dong Xihui,
Gardner Paul,
Reitz Thomas L.,
Huang Kevin,
Chen Fanglin
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04221.x
Subject(s) - materials science , anode , perovskite (structure) , conductivity , electrolyte , lanthanum , ionic conductivity , solid oxide fuel cell , cathode , inorganic chemistry , analytical chemistry (journal) , oxide , electrochemistry , chemical engineering , chemistry , metallurgy , electrode , chromatography , engineering
Sr‐ and Mn‐doped LaGaO 3 (La 0.8 Sr 0.2 Ga 0.5 Mn 0.5 O 3−δ , LSGMn) has been synthesized using a glycine nitrate combustion method. Powder X‐ray diffraction examinations show that the synthesized LSGMn has a pure single cubic perovskite phase. Four‐probe direct current conductivity characterization indicates that the conductivity of the sintered LSGMn in wet H 2 is lower than that in air, whereas the activation energy in wet H 2 is higher than that in air. Such an expected p ‐type conduction mechanism is the result of the valence change of Mn, which enables LSGMn to be a mixed ionic and electronic conductor. Using LSGMn as an anode and LSCF as a cathode, the peak power density at 800°C of the LSGM electrolyte supported all‐perovskite cells can reach 460 mW/cm 2 using wet H 2 as fuel and ambient air as an oxidant. Further, LSGMn anode has showed reasonable sulfur tolerance in H 2 ‐containing 100 ppm H 2 S and the all‐perovskite cell has demonstrated good performance stability in the short‐term operation at a constant cell voltage of 0.7 V.