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A COMPOSITE ELECTROLYTE FOR AN SOFC CONSISTING OF A CERIA SHEET AND A ZIRCONIA FILM DEPOSITED BY THE SOL-GEL METHOD

Published online by Cambridge University Press:  10 February 2011

Reiichi Chiba ,
Fumikatsu Yoshimura  and
Junichi Yamaki
Reiichi Chiba
Affiliation:
NTT Integrated Information & Energy Systems Laboratories, 162, Tokai-Mura, Ibaraki-Ken, 319–11, Japan, chiba@iba.iecl.ntt.co.jp
Fumikatsu Yoshimura
Affiliation:
NTT Integrated Information & Energy Systems Laboratories, 162, Tokai-Mura, Ibaraki-Ken, 319–11, Japan, chiba@iba.iecl.ntt.co.jp
Junichi Yamaki
Affiliation:
Institute of Advanced Material Study, Kyushu University, Kasuga Koen 6–1, Kasuga 816, Japan
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Abstract

We investigated a composite electrolyte for solid oxide fuel cells prepared by coating a ceria sheet (Ce0.8Gd0.2O2-d or GDC ) with a scandia alumina doped zirconia (0.850ZrO2-0.110Sc2O3-0.04Al2O3) film by the sol-gel method. The sol-gel film annealed at 1200°C was examined by X-ray diffraction analysis and found to be in a cubic phase at room temperature. The ionic conductivity of this film is comparable to that of bulk sintered at 1620°C. Scanning electron microscope observations revealed that the film forms a good interface with the electrolyte of the ceria sheet, even though the annealing temperature is as low as 1200°C.

We fabricated a single cell consisting of a composite electrolyte, a La0.8Sr0.2MnO3 cathode and a Ni-YSZ anode. The composite electrolyte consisted of zirconia film about one micron thick deposited by the sol-gel method and a 0.2 mm thick ceria sheet.

A cell operated with moist H2 and O2 gas exhibited an open circuit voltage of 1.00 V at 800°C. This value is much closer to the value of 1.13 V expected from the Nernst equation than the value of 0.76 V for a cell with a ceria sheet but without the sol-gel film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 185
Copyright
Copyright © Materials Research Society 1998

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References

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