0
Journal of Fuel Cell Science and Technology | Volume 8 | Issue 5 | Research Paper
Research Papers

Evaluation of SrTi1−x Cox O3 Perovskites (0 ≤ x ≤ 0.2) as Interconnect Materials for Solid Oxide Fuel Cells

[+] Author and Article Information
Masashi Mori1

Zhenwei Wang, Nobuyuki Serizawa

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196 Japan

Takanori Itoh

AGC Seimi Chemical Co., Ltd., 3-2-10 Chigasaki, Chigasaki-shi, Kanagawa-ken 253-8585 Japan

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(5), 051010 (Jun 20, 2011) (6 pages) doi:10.1115/1.4003761 History: Received May 18, 2010; Revised November 23, 2010; Published June 20, 2011; Online June 20, 2011
Article
References
Figures
Citing Articles

The compatibility of SrTi1− x Cox O3 perovskites (0 ≤ x ≤ 0.2) was evaluated for use as interconnect materials in solid oxide fuel cells (SOFCs). Although SrTi1− x Cox O3 perovskites have a single perovskite phase in the range of 0 ≤ x ≤ 0.2, it was observed for SrTi0.8 Co0.2 O3 that Co element agglomerated at the grain boundary during sintering. The dense SrTi0.8 Co0.2 O3 sample was destroyed and included Sr2 TiO4 as a secondary phase after reducing treatment at 1000 °C. As a result of Co doping, the linear thermal expansion coefficient (TEC) increased remarkably with increasing Co content, but the TEC of SrTi0.9 Co0.1 O3 was comparable with those of SOFC cathodes and anodes. Co doping of SrTiO3 effectively increased electrical conductivity in air, whereas the conductivity of Co-doped SrTiO3 in a reducing atmosphere was much lower than that in air. This suggests that the Co ions3+/4+ in the perovskites were earlier reduced into Co2+ ions, compared to Ti4+ ions.
FIGURES IN THIS ARTICLE
<>
Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
+Relative density of SrTi1− x Cox O3 as a function of firing temperature, where the holding time at the highest temperature was 5 h
View Large  |  Save Figure  |  Download Slide (.ppt)
Relative density of SrTi1− x Cox O3 as a function of firing temperature, where the holding time at the highest temperature was 5 h
Figure 4

Relative density of SrTi1− x Cox O3 as a function of firing temperature, where the holding time at the highest temperature was 5 h

Grahic Jump Location
+SEM micrographs of surface section of the dense samples after firing at 1400 °C. (a) SrTi0.95 Co0.05 O3 . (b) SrTi0.9 Co0.1 O3 .
View Large  |  Save Figure  |  Download Slide (.ppt)
SEM micrographs of surface section of the dense samples after firing at 1400 °C. (a) SrTi0.95 Co0.05 O3 . (b) SrTi0.9 Co0.1 O3 .
Figure 5

SEM micrographs of surface section of the dense samples after firing at 1400 °C. (a) SrTi0.95 Co0.05 O3 . (b) SrTi0.9 Co0.1 O3 .

Grahic Jump Location
+Dense SrTi0.8 Co0.2 O3 sample after firing at 1400 °C. Bright parts represent Co element. (a) SEM micrograph of surface section. (b) Co element distribution of EDX map.
View Large  |  Save Figure  |  Download Slide (.ppt)
Dense SrTi0.8 Co0.2 O3 sample after firing at 1400 °C. Bright parts represent Co element. (a) SEM micrograph of surface section. (b) Co element distribution of EDX map.
Figure 6

Dense SrTi0.8 Co0.2 O3 sample after firing at 1400 °C. Bright parts represent Co element. (a) SEM micrograph of surface section. (b) Co element distribution of EDX map.

Grahic Jump Location
+Amount of oxygen deficiencies in SrTi1− x Cox O3−δ in air and in the H2 atmosphere, when the oxygen deficiency of the unfired Co-doped perovskites is assumed to be zero at 25 °C. (a) In air during the 1st heating cycle. (b) In the H2 atmosphere during the first heating cycle. (c) In the H2 atmosphere during the first cooling cycle.
View Large  |  Save Figure  |  Download Slide (.ppt)
Amount of oxygen deficiencies in SrTi1− x Cox O3−δ in air and in the H2 atmosphere, when the oxygen deficiency of the unfired Co-doped perovskites is assumed to be zero at 25 °C. (a) In air during the 1st heating cycle. (b) In the H2 atmosphere during the first heating cycle. (c) In the H2 atmosphere during the first cooling cycle.
Figure 7

Amount of oxygen deficiencies in SrTi1− x Cox O3−δ in air and in the H2 atmosphere, when the oxygen deficiency of the unfired Co-doped perovskites is assumed to be zero at 25 °C. (a) In air during the 1st heating cycle. (b) In the H2 atmosphere during the first heating cycle. (c) In the H2 atmosphere during the first cooling cycle.

Grahic Jump Location
+XANES spectra of SrTi0.9 Co0.1 O3−δ perovskites as sintered and reduced, and reference materials. (a) Co K-edge. (b) Ti K-edge.
View Large  |  Save Figure  |  Download Slide (.ppt)
XANES spectra of SrTi0.9 Co0.1 O3−δ perovskites as sintered and reduced, and reference materials. (a) Co K-edge. (b) Ti K-edge.
Figure 8

XANES spectra of SrTi0.9 Co0.1 O3−δ perovskites as sintered and reduced, and reference materials. (a) Co K-edge. (b) Ti K-edge.

Grahic Jump Location
+Thermal expansions of SrTi1− x Cox O3 in air, and in the H2 atmosphere during the first/second heating cycles, respectively. (a) In air during the 1st heating cycle. (b) In the H2 atmosphere during the first heating cycle. (c) In the H2 atmosphere during the second heating cycle.
View Large  |  Save Figure  |  Download Slide (.ppt)
Thermal expansions of SrTi1− x Cox O3 in air, and in the H2 atmosphere during the first/second heating cycles, respectively. (a) In air during the 1st heating cycle. (b) In the H2 atmosphere during the first heating cycle. (c) In the H2 atmosphere during the second heating cycle.
Figure 9

Thermal expansions of SrTi1− x Cox O3 in air, and in the H2 atmosphere during the first/second heating cycles, respectively. (a) In air during the 1st heating cycle. (b) In the H2 atmosphere during the first heating cycle. (c) In the H2 atmosphere during the second heating cycle.

Grahic Jump Location
+Differential coefficient of thermal expansion – temperature curves of (i) SrTiO3 and (ii) SrTi0.9 Co0.1 O3 in air and in the H2 atmosphere during the first cycles, respectively. (a) In air. (b) In the H2 atmosphere.
View Large  |  Save Figure  |  Download Slide (.ppt)
Differential coefficient of thermal expansion – temperature curves of (i) SrTiO3 and (ii) SrTi0.9 Co0.1 O3 in air and in the H2 atmosphere during the first cycles, respectively. (a) In air. (b) In the H2 atmosphere.
Figure 10

Differential coefficient of thermal expansion – temperature curves of (i) SrTiO3 and (ii) SrTi0.9 Co0.1 O3 in air and in the H2 atmosphere during the first cycles, respectively. (a) In air. (b) In the H2 atmosphere.

Grahic Jump Location
+TEC values of SrTi1− x Cox O3 in the temperature range from 50 to 1000 °C in air and in the H2 atmosphere
View Large  |  Save Figure  |  Download Slide (.ppt)
TEC values of SrTi1− x Cox O3 in the temperature range from 50 to 1000 °C in air and in the H2 atmosphere
Figure 11

TEC values of SrTi1− x Cox O3 in the temperature range from 50 to 1000 °C in air and in the H2 atmosphere

Grahic Jump Location
+Arrhenius plots of electrical conductivity in air, in the 30%H2 -N2 atmosphere and in a dual atmosphere. (a) SrTi0.95 Co0.05 O3 . (b) SrTi0.9 Co0.1 O3
View Large  |  Save Figure  |  Download Slide (.ppt)
Arrhenius plots of electrical conductivity in air, in the 30%H2 -N2 atmosphere and in a dual atmosphere. (a) SrTi0.95 Co0.05 O3 . (b) SrTi0.9 Co0.1 O3
Figure 12

Arrhenius plots of electrical conductivity in air, in the 30%H2 -N2 atmosphere and in a dual atmosphere. (a) SrTi0.95 Co0.05 O3 . (b) SrTi0.9 Co0.1 O3

Grahic Jump Location
+Arrhenius plots of electrical conductivity of SrTi0.9 Co0.1 O3 tablet with thickness of 0.4 mm in air and in the 30%H2 -N2 atmosphere and in a dual atmosphere
View Large  |  Save Figure  |  Download Slide (.ppt)
Arrhenius plots of electrical conductivity of SrTi0.9 Co0.1 O3 tablet with thickness of 0.4 mm in air and in the 30%H2 -N2 atmosphere and in a dual atmosphere
Figure 13

Arrhenius plots of electrical conductivity of SrTi0.9 Co0.1 O3 tablet with thickness of 0.4 mm in air and in the 30%H2 -N2 atmosphere and in a dual atmosphere

Grahic Jump Location
+Lattice parameters of of SrTi1− x Cox O3 perovskites with cubic symmetry before and after reducing at 1000 °C in the H2 atmosphere
View Large  |  Save Figure  |  Download Slide (.ppt)
Lattice parameters of of SrTi1− x Cox O3 perovskites with cubic symmetry before and after reducing at 1000 °C in the H2 atmosphere
Figure 3

Lattice parameters of of SrTi1− x Cox O3 perovskites with cubic symmetry before and after reducing at 1000 °C in the H2 atmosphere

Grahic Jump Location
+XRD patterns of SrTi1− x Cox O3 perovskites after reducing at 1000 °C for 20 h in the H2 atmosphere: (a) x = 0.05, (b) x = 0.1, (c) x = 0.2. The symbols (×) represent the second phase.
View Large  |  Save Figure  |  Download Slide (.ppt)
XRD patterns of SrTi1− x Cox O3 perovskites after reducing at 1000 °C for 20 h in the H2 atmosphere: (a) x = 0.05, (b) x = 0.1, (c) x = 0.2. The symbols (×) represent the second phase.
Figure 2

XRD patterns of SrTi1− x Cox O3 perovskites after reducing at 1000 °C for 20 h in the H2 atmosphere: (a) x = 0.05, (b) x = 0.1, (c) x = 0.2. The symbols (×) represent the second phase.

Grahic Jump Location
+Experimental equipment for electrical conductivity measurement of the SrTi0.9 Co0.1 O3 placed in an SOFC atmosphere
View Large  |  Save Figure  |  Download Slide (.ppt)
Experimental equipment for electrical conductivity measurement of the SrTi0.9 Co0.1 O3 placed in an SOFC atmosphere
Figure 1

Experimental equipment for electrical conductivity measurement of the SrTi0.9 Co0.1 O3 placed in an SOFC atmosphere

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Lay-Up and Start-Up Practices
Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration> Chapter 7
Upset Conditions and Countermeasures
Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration> Chapter 6
Investigation of the Dynamic Characteristics of Cardio-Respiratory Response OT Treadmill Running Exercise for Interval Training
International Conference on Measurement and Control Engineering 2nd (ICMCE 2011)
On the Evaluation of Thermal and Mechanical Factors in Low-Speed Sliding
Tribology of Mechanical Systems> Chapter 11
Recovery of Gold Ions from Copper Anode Slime by Means of Magnetite Nanoparticles
International Conference on Computer and Electrical Engineering 4th (ICCEE 2011)
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In