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A Controlled Solid State Diffusion Process to form Cermet Anodes for Solid Oxide Fuel Cells

Published online by Cambridge University Press:  10 February 2011

Eric Z. Tang ,
Douglas G. Ivey  and
Thomas H. Etsell
Eric Z. Tang
Affiliation:
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, CanadaT6G 2G6
Douglas G. Ivey
Affiliation:
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, CanadaT6G 2G6
Thomas H. Etsell
Affiliation:
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, CanadaT6G 2G6
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Abstract

The interfacing of thin film vapor deposition technologies and solid state electrochemistry has led to the recent development of polarized electrochemical vapor deposition (PEVD). In this study, PEVD was applied to deposit a thin layer of yttria stabilized zirconia (YSZ) over a porous metallic electrode to form the cermet anode of a solid oxide fuel cell (SOFC). During PEVD, oxygen ions are transported through the solid electrolyte of an SOFC under an electrical potential gradient provided by an external dc source. At the metallic electrode (anode) surface, oxygen ions react electrochemically with ZrCl4and YCl3 in the vapor phase to deposit YSZ. The growth of YSZ resembles the mechanisms illustrated in Wagner's tarnishing theory. However, modification has been made to the initial growth of YSZ at both electronically and ionically shorted paths along the metallic electrode and solid electrolyte surfaces, respectively. The initial experimental results in the present study showed that PEVD is capable of depositing a thin layer of YSZ on a porous metallic electrode to form a cermet anode. This layer not only provides a continuous ionic conducting path in the anode to reduce the overpotential loss, but also protects the metallic electrode from further sintering, vapor loss and poisoning in the harsh SOFC operating conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 527: Symposium Z – Diffusion Mechanisms in Crystalline Materials , 1998 , 539
Copyright
Copyright © Materials Research Society 1998

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References

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