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First China-Japan Workshop on Solid Oxide Fuel Cells

Preparation of a 3DOM Ni–YSZ Anode With a Dense YSZ Thin Electrolyte Layer for Solid Oxide Fuel Cells

[+] Author and Article Information
Hirokazu Munakata, Masashi Otani

Department of Applied Chemistry, Graduate School of Urban Environmental Science, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan; CREST of Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

Kiyoshi Kanamura1

Department of Applied Chemistry, Graduate School of Urban Environmental Science, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan; CREST of Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japankanamura@tmu.ac.jp

1

Corresponding author.

J. Fuel Cell Sci. Technol 5(3), 031206 (May 23, 2008) (4 pages) doi:10.1115/1.2930770 History: Received September 10, 2007; Revised October 15, 2007; Published May 23, 2008

A three-dimensionally ordered macroporous (3DOM) Ni–yttria stabilized zirconia (YSZ) anode with a YSZ thin electrolyte layer was developed by a colloidal crystal templating method in order to lower the operating temperature of solid oxide fuel cells due to a high and uniform electrochemical interface that originated from a 3DOM structure. In the present study, 2μm polystyrene beads were used as the template. The anode structure was strongly influenced by the pH of the suspension, and it was optimized to 1.8 according to the zeta-potential measurement and scanning electron microscope observation. The 3DOM anode and thin electrolyte layer were simultaneously formed by sintering the deposit that was obtained by filtering two kinds of suspensions by turns. Here, we successfully obtained a 3DOM anode with high porosity of 72% and a 3μm thin YSZ layer on it, which was favorable in reducing both electrolyte and polarization resistances.

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Figures

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Figure 1

Preparation procedure of the 3DOM NiO-YSZ membrane using colloidal crystal templating method

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Figure 2

Zeta potential of (●) NiO-YSZ particles and (○) polystyrene beads as a function of pH. The measurement was conducted at 25°C.

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Figure 3

SEM images of NiO-YSZ membranes prepared from aqueous NiO-YSZ (ϕ=410nm)∕polystyrene (ϕ=2μm) suspensions with different pH values: (a) 1.8, (b) 3.8, and (c) 7.0

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Figure 4

SEM image of the 3DOM Ni-YSZ anode obtained by the reduction of the NiO-YSZ membrane prepared at pH=1.8

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Figure 5

XRD patterns of 3DOM NiO-YSZ (a) before and (b) after the reduction at 800°C in H2 (3%)–Ar (97%) mixed atmosphere

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Figure 6

Typical SEM images of the (a) surface and (b) cross section of a YSZ thin film on a 3DOM Ni-YSZ anode, obtained by sintering the deposit that was obtained by filtering two kinds of suspensions for the anode and electrode by turns

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