Abstract
This work provides discussion on the subject of deriving tortuosity from a saturation current and a mass transport model. In the conducted research an anode-supported solid oxide fuel cell (SOFC) with Nickel/Yttria-Stabilized Zirconia (Ni/YSZ) anode, Yttria-Stabilized Zirconia (YSZ) electrolyte, and Lanthanum Strontium Cobalt Ferrite oxide (LSCF) cathode was tested. Current densities under concentration polarization were measured for different hydrogen partial pressure on the anodic side. Mass transport through a porous anode was analyzed for the H2–N2–H2O ternary system. Cell performances were measured at 700 [°C] and 800 [°C] with air as an oxidant. Obtained saturation current densities were used for the tortuosity calculations. The presented calculation methodology was based on the Stefan–Maxwell equation and Kundsen diffusion. After the power generation experiment, a three dimensional structure was reconstructed using a combination of scanning electron microscope and focus ion beam milling (FIB–SEM). Finally, tortuosity values derived from the transport limitation and structure analysis were juxtaposed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.