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On the steady-state chemical potential profiles in bilayer solid electrolytes

Published online by Cambridge University Press:  05 July 2012

Han-Ill Yoo ,
Tae-Hyun Kwon  and
Taewon Lee
Han-Ill Yoo*
Affiliation:
WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Tae-Hyun Kwon
Affiliation:
WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Taewon Lee
Affiliation:
WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
*
a)Address all correspondence to this author. e-mail: hiyoo@snu.ac.kr
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Abstract

All the existing theories presuppose the continuity of oxygen chemical potential at interfaces between contiguous layers, in calculating steady-state chemical potential profiles across a multilayer composite of mixed conductor oxides that is subjected to an oxygen chemical potential gradient of whatsoever origin, but they have never been tested experimentally. We have observed that this continuity hypothesis appears to break down in yttria-stabilized zirconia/gadolinia-doped ceria bilayer electrolytes under an electric tension in ion-blocking condition (Hebb–Wagner polarization). It is suggested that all the continuity hypothesis-based existing theories to calculate the steady-state chemical potential distributions may not always be true depending on boundary conditions.

Keywords

Bilayer YSZ/GDC electrolytesChemical potential distributionElectronic conductivity
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 15: Focus Issue: Advanced Materials for Fuel Cells , 14 August 2012 , pp. 1969 - 1974
Copyright
Copyright © Materials Research Society 2012

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References

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