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Research Papers

Fabrication of Anode-Supported Tubular Solid Oxide Fuel Cells by Slip Casting in Combination With Dip Coating Technique

[+] Author and Article Information
Yaohui Zhang, Juan Yin

College of Chemistry, South China University of Technology, Guangzhou 510640, People’s Republic of China

Jiang Liu1

College of Chemistry, South China University of Technology, Guangzhou 510640, People’s Republic of Chinajiangliu@scut.edu.cn

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(1), 011014 (Nov 10, 2009) (5 pages) doi:10.1115/1.3119058 History: Received November 10, 2007; Revised January 15, 2008; Published November 10, 2009; Online November 10, 2009

Abstract

Dense and microcrack free yttria-stabilized zirconia (YSZ) was deposited onto porous NiO-YSZ anode tubes by dip coating without any vacuum assistance. The anode tubes were prepared by slip casting. Open circuit voltage of 1.05 V was obtained at $800°C$, implying that the gas tightness of dip coating YSZ membranes is eligible for solid oxide fuel cell application. A fuel cell of $Ni-YSZ/YSZ(20 μm)/La0.7Sr0.3MnO3$-YSZ provides maximum power densities of $0.24 W/cm2$, $0.46 W/cm2$, $0.81 W/cm2$, and $1.1 W/cm2$ at $650°C$, $700°C$, $750°C$, and $800°C$, respectively. The impedance data indicate that the resistivity of the YSZ electrolyte membrane is about $40.5 Ω cm$ at $800°C$. At the same temperature, the electrode polarization resistance accounts for 74.8% of the cell’s total resistance under maximum power density condition.

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Figures

Figure 1

Schematic diagram of slip casting technique: (a) a plaster mold filled with NiO-YSZ suspension and (b) water in the NiO-YSZ suspension was absorbed by the plaster mold and a green NiO-YSZ layer was formed

Figure 2

Schematic diagram of the cell testing set

Figure 3

Photo of (a) slip casting anode tubes after sintering at 1000°C for 3 h, (b) anode tubes with dip coating green YSZ membranes, and (c) anode tubes with YSZ membranes after sintering at 1400°C for 4 h

Figure 4

Cross section of (a) single cell and (b) surface of the YSZ membrane

Figure 5

Effect of dipping times on the thickness of YSZ membranes

Figure 6

Typical I-V-P curve of fuel cell (Ni-YSZ/YSZ/LSM-YSZ) fabricated by slip casting in combination with dip coating. The cell has an YSZ membrane of 20 μm thick. Humidified hydrogen and stationary air was used as fuel and oxidant, respectively.

Figure 7

Impedance spectra of the cell tested from 650°C to 800°C. The data were collected under open circuit condition.

Figure 8

Ratios of electrode polarization to the total resistance of the cell (ηe/ηt) under current loading at 800°C

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