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Research Papers

Development of Ceria Based SOFCs With a High Performance La0.6Sr0.4Co0.2Fe0.8O3δCe0.9Gd0.1O1.95Ag Composite Cathode

[+] Author and Article Information
Y. Liu

Energy Material Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Dingxi Road 1295, Shanghai, 200050 China

K. Yasumoto, S. Hashimoto, K. Takei, M. Mori

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

Y. Funahashi

 Fine Ceramics Research Association, 2266-99 Anagahora, Shimo-shidami, Moriyama-ku, Nagoya, Aichi 463-8561 Japan

Y. Fijishiro

Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Shimo-shidami, Moriyama-ku, Nagoya, Aichi 463-9560, Japan

A. Hirano, Y. Takeda

Department of Chemistry, Faculty of Engineering, Mie University, Kamihama-cho, Tsu, Mie 514-8507, Japan

J. Fuel Cell Sci. Technol 7(6), 061003 (Aug 17, 2010) (5 pages) doi:10.1115/1.3176220 History: Received November 21, 2007; Revised December 11, 2007; Published August 17, 2010; Online August 17, 2010

In this work, a microtubular cell consisting of a thin Ce0.9Gd0.1O1.95 (GDC) electrolyte (thickness: below 10μm) on a support NiO/GDC anode (1.8 mm outer diameter, 200μm wall thickness) with a La0.6Sr0.4Co0.2Fe0.8O3δ/GDC functional cathode has been developed for intermediate/low temperature operation. The functional cathode was prepared by in situ infiltrating the electrochemically catalytic nano-Ag particles into the as-established 20μm thick cathode. The as-proposed Ag-impregnation route ensures a very homogeneous particle dispersion and a good adhesion of Ag to the ceramic matrices. The cells were successfully operated to produce the maximum power densities of 0.41Wcm2 (1.27Acm2, 0.32 V), 0.83Wcm2 (2.23Acm2, 0.37 V), and 1.05Wcm2 (2.39Acm2, 0.44 V) at 450°C, 500°C, and 550°C, respectively.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Photo view of microtubular cells before and after Ag-loading; SEM micrographs of (b) the cross section of the microtubular cell, and (c) the enlarged view at the anode/electrolyte/cathode section after reduction

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Figure 2

(a) Schema of the experimental apparatus for the microtubular anode-supported cell measurement; (b) the enlarged view at the cross section of the sealant cover and current collection through the cell, I1, I2: current collect terminals, and V1, V2: voltage detect terminals

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Figure 3

Current density-voltage and power density characteristics of the cell at 450°C, 500°C, and 550°C

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Figure 4

XRD of the resulting LSCF-GDC-Ag composite electrode

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Figure 5

(a) BSE-SEM micrograph of the cross section of the LSCF-GDC-Ag cathode; (b) SEM micrograph of the cross section of the cathode section, and (c) Ag distribution of the EDX analysis from (b). Some examples for the locations of the nano-Ag were plotted in (a).

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Figure 6

Current density-voltage and power density characteristics of the cell with the LSCF-GDC-Ag cathode at 450°C, 500°C, and 550°C

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Figure 7

Impedance spectra for the cell without and after Ag-loading measured at 450°C, 500°C, and 550°C

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Figure 8

Area specific resistance of the different resistances for the cell before and after Ag-loading in comparison with the resistance of the thin GDC electrolyte

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