Y-doped BaZrO

Figure 23. Proton conductivities of Y-doped BaZrOs and BaCeOs in comparison with the ion conductivity of the relevant solid oxygen ion electrol3rtes. Reprinted from K.D. Kreuer, St. Adams, W. Miinch, A. Fuchs, U. Klock, and J. Maier, Solid State Ionics, 155 (2001) 295-306. Copyright 2001 with permission from Elsevier.

Grain-Boundary Conductivity, Fig. 4 A log-log plot of the current-voltage curve measured for a single grain boundary in 2 mol% Y-doped BaZrOs at 350 °C [15]... 

Iguchi F, Chen CT, Yugami H, Kim S (2011) Direct evidence of potential barriers at grain boundaries in Y-doped BaZrO(3) from dc-bias dependence measurements. J Mater Chem 21 16517-16523... 

High bulk proton conductivity, high stability, and a wide ionic domain [47] therefore make Y-doped BaZrOs an interesting parent compound for the development of proton-conducting electrolytes for SOFC applications. Unfortunately, the unfavorable brittleness, the grain boundary impedance, and the increasing phase instability with increasing Y-dopant level remain problems to be solved. The addition of small amounts of BaCeOs or a compromise in the choice of the kind of dopant may help to reduce these problems. 

---