Research Papers

Plasma-Sprayed Y2O3-Stabilized ZrO2 Electrolyte With Improved Interlamellar Bonding for Direct Application to Solid Oxide Fuel Cells

[+] Author and Article Information
Shan-Lin Zhang, Chang-Jiu Li

State Key Laboratory for Mechanical
Behavior of Materials,
School of Materials Science and Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China

Cheng-Xin Li

State Key Laboratory for Mechanical
Behavior of Materials,
School of Materials Science and Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: licx@mail.xjtu.edu.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received July 3, 2012; final manuscript received November 22, 2013; published online January 24, 2014. Assoc. Editor: Abel Hernandez-Guerrero.

J. Fuel Cell Sci. Technol 11(3), 031005 (Jan 24, 2014) (6 pages) Paper No: FC-12-1063; doi: 10.1115/1.4026143 History: Received July 03, 2012; Revised November 22, 2013

Atmospheric plasma spraying was employed to prepare anode, cathode, and Y2O3-stabilized ZrO2 (YSZ) electrolyte to aim at reducing manufacturing cost. YSZ electrolytes were deposited on the anode at different deposition temperatures of 200 °C, 400 °C and 600 °C to optimize the gas tightness of plasma-sprayed YSZ electrolyte. The influences of the deposition temperature on the microstructure and gas-tightness of plasma-sprayed YSZ electrolyte were investigated. The effect of microstructure and the gas-tightness of YSZ electrolyte on the open circuit voltage and the output performance of solid oxide fuel cells (SOFCs) were examined. The results showed with the increase of deposition temperature, the porosity of YSZ electrolytes almost decreased by about 80% and the microstructure of YSZ electrolytes changed from the typical lamellar structure to the continuous columnar crystal structure. At a deposition temperature of 600 °C the gas permeability decreased to 1.5 × 10−7 cm4gf−1s−1, and the highest open circuit voltage can reach 1.026 V, indicating the applicability of the as-sprayed YSZ directly to the SOFC electrolyte.

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Fig. 1

The morphology of the YSZ powders

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Fig. 2

The scheme of the tester for gas permeability

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Fig. 3

Microstructure of the polished single cell and electrolytes cross-section: (a) single cell; (b) YSZ electrolyte deposited at 200 °C; (c) YSZ electrolyte deposited at 400 °C; and (d) YSZ electrolyte deposited at 600 °C

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Fig. 4

Microstructure of the fractured electrolytes prepared at difference deposition temperatures: (a) and (b) deposited at 200 °C; (c) and (d) deposited at 400 °C; (e) and (f) deposited at 600 °C; (a), (c) and (e) at low magnification; and (b), (d) and (f) at high magnification

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Fig. 5

(a) Porosity and (b) gas leakage rate of electrolytes at different deposition temperatures

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Fig. 6

Open circuit voltage of the as-sprayed cells with different electrolyte deposition temperature

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Fig. 7

Output performance of as-sprayed cells: (a) I-V and I-P curves at 1000 °C for the cell with different electrolyte deposition temperature; (b) maximum output power density at different working temperature for the cell with different electrolyte deposition temperature




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