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Densification and Cell Performance of Gadolinium‐Doped Ceria (GDC) Electrolyte/NiO–GDC Anode Laminates
Author(s) -
Nagamori Minako,
Shimonosono Taro,
Sameshima Soichiro,
Hirata Yoshihiro,
Matsunaga Naoki,
Sakka Yoshio
Publication year - 2009
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.1551-2916.2008.02646.x
Subject(s) - materials science , electrolyte , anode , non blocking i/o , sintering , shrinkage , cathode , composite material , electrode , gadolinium , composite number , power density , doping , metallurgy , catalysis , electrical engineering , chemistry , biochemistry , power (physics) , physics , optoelectronics , quantum mechanics , engineering
A thin film (60 μm thick) of a gadolinium‐doped ceria (GDC) electrolyte was prepared by the doctor blade method. This film was laminated with freeze‐dried 42 vol% NiO–58 vol% GDC mixed powder and pressed uniaxially or isostatically under a pressure of 294 MPa. This laminate was cosintered at 1100 °–1500 °C in air for 4–12 h. The laminate warped because of the difference in the shrinkage of the electrolyte and electrode during the sintering. A higher shrinkage was measured for the electrode at 1100 °–1200 °C and for the electrolyte at 1300 °–1500 °C. The increase of the thickness of anode was effective in decreasing the warp and in increasing the density of the laminated composite. The maximum electric power density with a SrRuO 3 cathode using 3 vol% H 2 O‐containing H 2 fuel was 100 mW/cm 2 at 600 °C and 380 mW/cm 2 at 800 °C, respectively, for the anode‐supported GDC electrolyte with 30 μm thickness.