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, BaCoO_3-x (BCO) nano-particles, which can dramatically enhance the ORR activity and durability of a state-of-the-art La_0.6Sr_0.4Co_0.2Fe_0.8O_3-x (LSCF) cathode exposed to Cr. For example, the polarization resistance (R_p) of bare LSCF cathode increases from ∼0.4 to ∼1.5 Ωcm² after 100hs exposure to Cr in air with 3%H₂O at 750 ^oC. In contrast, R_p of a BCO-coated LSCF cathode remains to be ∼0.05 Ω cm² under the same condition, suggesting that BCO is catalytically active to ORR but inert to Cr-poisoning. At 700 ^oC, the single cells with BCO- LSCF cathode show an excellent peak power density of ∼0.514Wcm^-2 and significantly enhanced durability (degradation rate of 0.086%h^-1 at 0.8V), much better than those of cells with a bare LSCF cathode (∼0.448 Wcm^-2 and degradation rate of 0.31%h^-1 at 0.8V). 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.

固体氧化物燃料电池（SOFC）阴极的氧还原反应（ORR）的耐久性和电催化活性经常由于诸如互连器中的Cr等中毒作用而严重劣化。在这里，我们报告了我们在开发耐铬催化剂BaCoO _3-x（BCO）纳米颗粒方面的发现，该催化剂可显着增强最新技术La _0.6 Sr _0.4 Co _0.2的ORR活性和耐久性。暴露于Cr的Fe _0.8 O _3-x（LSCF）阴极。例如，极化电阻（[R _p从〜0.4〜1.5至欧姆厘米裸LSCF阴极增加）²以后100HS暴露于铬与空气中的3％H ₂ø在750 ^ö C.相比之下，[R _p一个BCO涂覆LSCF阴极遗体是~0.05Ω厘米²相同的条件下，这表明BCO是催化活性的，以ORR但惰性的铬中毒。在700 ^o C时，带有BCO-LSCF阴极的单电池显示出约0.514Wcm ^-2的极佳峰值功率密度，并显着提高了耐久性（0.8V时的降解率为0.086％h ^-1），远优于带有BCO-LSCF阴极的单电池。裸露的LSCF阴极（〜0.448 Wcm ^-2且降解率为0.31％h ^-1在0.8V）。拉曼分析表明，BCO催化剂涂层的存在大大减少了在阴极表面上积累的Cr的量，从而减轻了SrCrO ₄的形成。