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Research Paper

Fabrication of Y2O3-Doped Zirconia/Gadolinia-Doped Ceria Bilayer Electrolyte Thin Film SOFC Cells of SOFCs by Single-Pulsed Laser Deposition Processing

[+] Author and Article Information
T. Mukai

e-mail: tmukai@chemeng.osakafu-u.ac.jp

S. Tsukui, M. Adachi

Department of Chemical Engineering,
Osaka Prefecture University,
1-1, Gakuen-cho, Naka-ku, Sakai,
Osaka 599-8531, Japan

K. Yoshida

Division of General Education,
Tokyo Metropolitan College of
Industrial Technology,
8-17-1, Minamisennju, Arakawa-ku,
Tokyo 116-0003, Japan

H. Ishibashi

Department of Physical Science,
Osaka Prefecture University,
1-1, Gakuen-cho, Naka-ku, Sakai,
Osaka 599-8531, Japan

T. Kusaka

Technology Research Institute of
Osaka Prefecture,
2-7-1, Ayumino, Izumi-si,
Osaka 594-1157, Japan

K. C. Goretta

International Office,
Air Force Office of Scientific Research,
Arlington, VA 22203-1768

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received June 1, 2013; final manuscript received July 8, 2013; published online September 13, 2013. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 10(6), 061006 (Sep 13, 2013) (6 pages) Paper No: FC-13-1059; doi: 10.1115/1.4025064 History: Received June 01, 2013; Revised July 08, 2013

An 8 -mol. % Y2O3-doped zirconia/10-mol. % GdO2-doped ceria (YSZ/GDC) bilayer electrolyte and a Gd0.5Sr0.5CoO3 (GSCO) cathode were deposited by a single-processing, pulsed laser deposition (PLD) method to fabricate anode support cells. No additional heat treatment was needed. Laser frequencies of 10, 20, and 100 Hz were used to deposit bilayer electrolytes between the NiO–YSZ (NiO:YSZ = 60:40 wt. %) anode substrate and the GSCO cathode thin film. The GDC thin film produced at 10 Hz was smooth, well-crystallized, and highly dense. The crystallinity of the GSCO cathode on the GDC was also improved. We concluded the GDC crystallinity affected the crystallinity of the cathode thin film. The resistivity of the YSZ single layer (5.7 μm thickness) was 1.4 times higher than that of the YSZ/GDC bilayer (YSZ 3.0 μm thickness, GDC 2.7 μm thickness) at 600 °C and that of the YSZ-GDC interface became low. The optimum YSZ thickness was found to be approximately 3.0 μm, at which thickness there was effective blocking of the passage of hydrogen molecules and electrons. A cell with a YSZ (3.0 μm thickness, fabricated at 20 Hz)/GDC (5.0 μm thickness, fabricated at 10 Hz) bilayer and GSCO cathode thin film exhibited a maximum power density of 400 mW·cm–2 at a comparatively low temperature of 600 °C.

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Figures

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Fig. 1

Surface SEM image of the NiO-YSZ substrate

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Fig. 2

Cross-sectional micrograph of the NiO-YSZ/YSZ/GSCO single electrolyte cell. YSZ was fabricated at 100 Hz of laser frequency: (a) SEM image and (b) EDX mapping

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Fig. 3

X-ray diffraction pattern (Cu Kα) of the NiO-YSZ/YSZ/GSCO single-electrolyte cell

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Fig. 4

Cross-sectional micrograph of the NiO-YSZ/YSZ/GDC/GSCO bilayer electrolyte cell. YSZ and GDC were fabricated at 100 Hz of laser frequency: (a) SEM image and (b) EDX mapping.

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Fig. 5

X-ray diffraction pattern (Cu Kα) of the NiO-YSZ/YSZ/GDC/GSCO bilayer electrolyte cell

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Fig. 6

Cross-sectional micrograph of the NiO-YSZ/YSZ/GDC/GSCO bilayer electrolyte cell: (a) GDC thin film deposited at 100 Hz and (b) GDC thin film deposited at 10 Hz

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Fig. 7

X-ray diffraction pattern (Cu Kα) of the NiO-YSZ/YSZ/GDC/GSCO bilayer electrolyte cell: (a) GDC thin film deposited at 100 Hz and (b) GDC thin film deposited at 10 Hz

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Fig. 8

Power densities and I-V characteristics of NiO-YSZ/YSZ/GSCO single electrolyte cell and NiO-YSZ/YSZ/GDC/GSCO bilayer electrolyte cell (GDC thin film deposited at 10 and 100 Hz) at 600 °C

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Fig. 9

Power densities and I-V characteristics of NiO-YSZ/YSZ/GDC/GSCO bilayer electrolyte cells with YSZ thin films deposited at different laser frequencies (20 and 100 Hz) at 600 °C

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Fig. 10

Power densities and I-V characteristics of NiO-YSZ/YSZ/GDC/GSCO bilayer electrolyte cells with different YSZ thicknesses (1.9, 2.7, 3.0, and 3.5 μm) at 600 °C. YSZ and GDC were deposited at 20 and 10 Hz, respectively.

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Fig. 11

Power densities and I-V characteristics of NiO-YSZ/YSZ (3.0 μm thickness, fabricated at 20 Hz)/GDC (5.0 μm thickness, fabricated at 10 Hz)/GSCO bilayer electrolyte cell

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