(459d) High-Temperature Co-Electrolysis of CO2 and H2o on Lanthanum Ferrite-Type Perovskite Oxide Cathodes
AIChE Annual Meeting
2021 Annual Meeting
Sustainable Engineering Forum
Advances in Clean Energy R&D (Invited Talks)
Tuesday, November 16, 2021 - 2:00pm to 2:30pm
The SOEC employed in the present work consists of an yttria-stabilized zirconia (YSZ) solid oxide oxygen ion conducting electrolyte, sandwiched between two electrode layers. The counter electrode (anode) is a commercially available mixture of La0.8Sr0.2MnO3 and YSZ (LSM-YSZ), whereas the working electrode (cathode) consists of an in-house developed lanthanum ferrite-type perovskite oxide. H2O and CO2 get electrolyzed at the cathode producing O2- ions which travel through the YSZ electrolyte to the anode where they combine to form molecular oxygen.
The B-site doped lanthanum ferrite perovskite materials used in this study as the working electrode were synthesized via EDTA-citric acid complexation method. The synthesized materials were characterized ex-situ, in-situ and operando using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS), Raman spectroscopy, transmission electron microscopy and four probe DC van der Paw techniques to investigate their morphology, bulk and surface structure and electrical conductivity and the changes in these properties during the electrochemical reaction under bias. The electrocatalytic activity tests showed that the synthesized perovskites are highly active in electrolysis of water and co-electrolysis of H2O and CO2, and H2/CO ratio of the product can be tuned through modifications on the A- and B-site doping.