In掺杂对Ba0.5Sr0.5CoO3-δ材料体系催化活性与耐水性的双重提升OA

As one of the most classic cathode material systems for solid oxide ful cell(SOFC),the Ba0.5Sr0.5CoO3-δ exhibits excellent oxygen surface exchange coefficients and bulk diffusion coefficients.However,the electrodes in this system typically suffer from unsatisfactory water tolerance,which limits their further application in the field of piotonic ceramic electrolysis cells(PCFCs).To address this issue,we designed and synthesized Ba0.5Sr0.5Co1-xInxO3-δ cathode materials.By introducing In3+ions with a slightly larger ionic radius and lower valence,the covalency of the chemical bonds within the lattice was enhanced,thereby reducing the lattice basicity and improving the water vapor tolerance of the cathode material.Furthermore,the introduction of the larger In3+ions induced the formation of a SrCoO3-δ cobalt-rich phase on the material surface,achieving a dual enhancement of both water tolerance and oxygen reduction reaction(ORR)activity.Its polarization resistance can reach as low as 0.064 Ω·cm2 at 600℃,and it can operate continuously for over 100 h at 500℃with an output voltage degradation rate of only 0.042％/h.This work provides comprehensive insights and broadens the prospects for the further application of In elements in the field of SOFC/PCFC cathode materials.