Novel Strategies to mitigate chromium poisoning on the air electrodes of solid oxide cells

Our research aims to improve the performance and chromium resistance of lanthanum nickelate (LNO) air electrodes for solid oxide cells (SOCs). We investigated putting simple perovskite and high-entropy perovskite (HEP) coatings on the LNO backbone. Our findings show that simple perovskite coatings considerably improve LNO oxygen exchange capacities. This improvement results from the incorporation of transition metal cations into the LNO structure, which improves catalytic performance and shows the potential for tailored property modifications. Notably, HEP coatings demonstrated remarkable performance. LNO coated with LSPYB revealed exceptional oxygen exchange capacities under both standard and aging circumstances. Meanwhile, LNO coated with LSPGB demonstrated exceptional chromium resistance, significantly outperforming self-coated LNO in chromium-rich settings. The improved performance of LNO+LSPGB shows that it has special properties that allow it to maintain and even improve functionality under difficult operating situations, such as chromium-contaminated environments or extended operational stress. This phenomenon is due to the intrinsic properties of high-entropy perovskite coatings, which include compositional complexity, structural stability, and resistance to surface degradation. Overall, our results show that high-entropy perovskite coatings have great promise as a technique for dramatically improving the catalytic activity, chemical stability, and chromium resistance of LNO-based electrodes. This discovery paves the way for the development of strong, highly efficient, and long-lasting materials ideal for advanced SOC applications that require great performance, dependability, and resilience under difficult operational conditions.