Abstract
The application of the (SScC) perovskite as a cathode material on the electrolyte for reduced-temperature-operation solid oxide fuel cells (SOFCs) was investigated in detail. Oxygen reduction reaction (ORR) on the SScC cathode was studied by two-electrode impedance, three-electrode-polarization test, and four-probe dc conductivity measurement at various temperatures, oxygen partial pressures, and polarization values. The oxygen nonstoichiometry of SScC is 0.552 at . An extremely high oxygen vacancy concentration in the SScC lattice decreased the resistances from oxygen adsorption, dissociation, and diffusion processes at low temperatures. This subsequently improved the electrochemical performance of the cathode. The polarization overpotential is only −110 mV for the SScC cathode at the current density of at in air. The kinetics of ORR on the SScC cathode was studied by ac impedance, which revealed that the charge-transfer process was the rate-determining step due to the extremely low electrical conductivity of SScC.
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.
