Abstract
Abstract The durability and electro-catalytic activity for oxygen reduction reaction (ORR) of solid oxide fuel cells (SOFCs) cathode often suffer from severe degradation due to poisoning effects such as Cr from interconnectors. Here we report our findings in the development of a Cr-tolerant catalyst, BaCoO3-x (BCO) nano-particles, which can dramatically enhance the ORR activity and durability of a state-of-the-art La0.6Sr0.4Co0.2Fe0.8O3-x (LSCF) cathode exposed to Crofer 22APU. For example, the polarization resistance (Rp) of a bare LSCF cathode increases from ~0.4 to ~1.5 Ωcm2 after 100 hs exposure to Cr in air with 3% H2O at 750 °C. In contrast, Rp of a BCO-coated LSCF cathode remains to be ~0.05 Ωcm2 under the same condition, suggesting that BCO is catalytically active to ORR but inert to Cr-poisoning. At 700 °C, the single cells with the BCO-coated LSCF cathode show an excellent peak power density of ~0.514 Wcm−2 and significantly enhanced durability (degradation rate of 0.086 %h−1 at 0.8 V), much better than those of cells with a bare LSCF cathode (~0.448 Wcm−2 and degradation rate of 0.31 %h−1 at 0.8 V). Raman analysis indicated that the presence of the BCO catalyst coating greatly reduced the amount of Cr accumulated on the cathode surface, thus alleviating the formation of SrCrO4.
Accepted Version (
Free)
Published Version
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 call