Abstract
Although it is commonly well known that the oxygen reduction reaction (ORR) at cathodes surface limits an overall SOFC performance, important issue of understanding ORR mechanism, necessary for further improvement of SOFC performance, is still in debate to date. One of the important factor of ORR that has been missing, is the chemical potential of electrons, me’, in oxide cathodes, which is related to the basicity of cathodes as well as RedOx state. In this report, cathode performance of PrO x -based materials has been examined to understand the effect of me’ and modification by applying basic component of BaPrO3 using EIS. For all of the examined PrO x -based electrodes, the area-specific conductivity corresponding to the ORR activity shows Po2 exponent of 1/2 under an isothermal condition, which suggests the elementary reaction of peroxide ion and oxygen vacancy is the rate-determining step. Improvement of the ORR activity was achieved by surface modification with BaPrO3, which is ascribed to the upward shift of E F and resultant increase in the population of surface peroxide ion.
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.
