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

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.

[1]  H. Yoo,et al.  Partial electronic conductivity and electrolytic domain of bilayer electrolyte Zr0.84Y0.16O1.92/Ce0.9Gd0.1O1.95 , 2011 .

[2]  Jong-Ho Lee,et al.  Reassessment of conventional polarization technique to measure partial electronic conductivity of electrolytes , 2010 .

[3]  T. Jacobsen,et al.  The Course of Oxygen Partial Pressure and Electric Potentials across an Oxide Electrolyte Cell , 2008 .

[4]  Randhir Singh,et al.  Calculation of the oxygen potential profile across solid-state electrochemical cells , 2003 .

[5]  S. Chan,et al.  A simple bilayer electrolyte model for solid oxide fuel cells , 2003 .

[6]  H. Yoo,et al.  Microstructural Changes in a Polycrystalline, Semiconducting Oxide under DC Electric Fields , 1998 .

[7]  Hermann Schmalzried,et al.  Chemical Kinetics of Solids , 1997 .

[8]  Uday B. Pal,et al.  Analytic Solution for Charge Transport and Chemical‐Potential Variation in Single‐Layer and Multilayer Devices of Different Mixed‐Conducting Oxides , 1996 .

[9]  F. Marques,et al.  Performance of double layer electrolyte cells Part I: Model behavior , 1996 .

[10]  Anil V. Virkar,et al.  Theoretical Analysis of Solid Oxide Fuel Cells with Two‐Layer, Composite Electrolytes: Electrolyte Stability , 1991 .

[11]  R. N. Blumenthal,et al.  Electronic Transport in 8 Mole Percent Y[sub 2]O[sub 3]-ZrO[sub 2] , 1989 .

[12]  N. S. Choudhury,et al.  Steady‐State Chemical Potential Profiles in Solid Electrolytes , 1970 .

[13]  B. E. Wilde,et al.  Electrochemical Measurements on Austenitic Stainless Steels in Boiling Magnesium Chloride , 1970 .

[14]  E. Wachsman,et al.  Stable High Conductivity Ceria/Bismuth Oxide Bilayered Electrolytes , 1997 .