Abstract
The effects of Sr doping on the Ba-site of SmBaCo2O5+δ in term of structure characteristics, thermal expansion coefficients (TECs), electrical properties and electrochemical performance have been investigated as cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The TECs of SBSC-based cathodes are calculated from 19.8−20.5×10−6K−1 in the temperature range of 100–800°C, and the TEC values decrease with increasing Sr content. The oxygen content and the average oxidation state of cobalt increase with increasing Sr content determined by the X-ray photoelectron spectroscopy (XPS) and Thermogravimetry analysis (TGA) results. At a given temperature, the electrical conductivity values are in the order as follows: SBSC55>SBSC73>SBSC91. This behavior might be due to the increase in electronic hole. The electrical conductivities of SBSC55 at 600°C are distributed in the range of 660S/cm of p(O2)=0.01atm to 1168S/cm of p(O2)=0.21atm, indicating that the cathode can endure reducing atmosphere. SBSC55 with high electrical conductivity in p(O2)=0.01atm is ascribed to SBSC55 with stable double-perovskite structure at such low oxygen partial pressure. The SBSC55 cathode showed the highest power density of 304mW/cm2 at operating temperature of 700°C. Based on the electrochemical properties, SBSC55 is a potential cathode for IT-SOFCs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
