Indium as an ideal functional dopant for a proton-conducting solid oxide fuel cell

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 0.7In 0.3O 3− δ (BCI30) membrane reached dense after sintering at 1100 °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 3Co 1.5Fe 1.5O 10− δ (LSCF) was also evaluated as a potential cathode candidate for a proton-conducting SOFC.