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Impedance Studies on Chromite‐Titanate Porous Electrodes under Reducing Conditions
Author(s) -
GonzálezCuenca M.,
Zipprich W.,
Boukamp B.A.,
Pudmich G.,
Tietz F.
Publication year - 2001
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 - 10.1002/1615-6854(200112)1:3/4<256::aid-fuce256>3.0.co;2-i
Subject(s) - materials science , lanthanum , conductivity , strontium titanate , electrode , perovskite (structure) , ceramic , titanium , chromite , anode , titanate , porosity , chromium , chemical engineering , mineralogy , inorganic chemistry , metallurgy , composite material , chemistry , nanotechnology , thin film , engineering
Two types of lanthanum based chromite‐titanate perovskite materials have been tested for use as porous ceramic anodes in SOFC applications. The calcium‐ or strontium‐ doped chromium‐rich materials, with composition La 0.7 A 0.3 Cr 0.8 Ti 0.2 O 3–δ ( A = Ca, Sr), showed p ‐type conductivity under reducing conditions. The titanium‐rich composition, La 0.7 Ca 0.3 Cr 0.2 Ti 0.8 O 3–δ , showed n ‐type conductivity. Both type of materials were active electrodes in a H 2 /H 2 O gas mixture at 850 °C. The electronic conductivity becomes an important limiting factor when the electrode thickness is reduced from 100 μm to 20 μm. For the 20