A high In-dopant level BaCeO(3) material was used as an electrolyte for a proton-conducting solid oxide fuel cell (SOFC). indium behaved as an ideal dopant for BaCeO(3), which improved both the chemical stability and sinterability for BaCeO(3) greatly. The anode supported BaCe(0.7)In(0.3)O(3-delta) (BCI30) membrane reached dense after sintering at 1100 degrees C, much lower than the sintering temperature for other BaCeO(3)-based materials. Additionally, the BCI30 membrane showed adequate chemical stability against CO(2) compared with the traditional rare earth doped BaCeO(3). The BCI30-based fuel cell also showed a reasonable cell performance and a good long-term stability under the operating condition. Besides, the LaSr(3)Co(1.5)Fe(1.5)O(10-delta) (LSCF) was also evaluated as a potential cathode candidate for a proton-conducting SOFC. (c) 2009 Internation Association for Hydrogen Ehergy. Published by Elsevier Ltd. All rights reserved