The europium dopant concentration in strontium cerate was studied to achieve maximum hydrogen permeation. In order to determine high ambipolar conductivity, total conductivity and open circuit potential measurements were performed. Among the three different compositions of Eu-doped SrCe1-xEuxO3-delta (x = 0.1, 0.15 and 0.2) studied, SrCe0.9Eu0.1O3-delta showed highest total conductivity between 600 degrees C and 900 degrees C. However, transference number measurements showed increasing electronic conductivity with increasing dopant concentration and a stronger temperature dependence for electronic conduction. Therefore, the highest ambipolar conductivity was obtained over the compositional range from SrCe0.85Eu0.15O3-delta to SrCe0.8Eu0.2O3-delta depending on temperature. Finally, the hydrogen permeation flux was calculated based on the ambipolar conductivity and compared with experimental results. (C) 2009 Elsevier B.V. All rights reserved.