Revealing Local Grain Boundary Chemistry and Correlating it with Local Mass Transport in Mixed-Conducting Perovskite Electrodes.

ABSTRACT: Grain boundary (GB) mass transport, and chemistry exert a pronounced influence on both the performance and stability of electrodes for solid oxide electrochemical cells. Lanthanum strontium cobalt ferrite (LSCF6428) is applied as a model mixed ionic and electronic conducting (MIEC) perovskite oxide. The cation-vacancy distribution at the GBs is studied at both single and multi-grain scales using high-resolution characterization techniques and computational approaches. The accumulation of oxygen vacancies ( VO··$V_O^{ \cdot \cdot }$ ) in the GB region, rather than necessarily at the GB core, results in an enhancement of the oxygen diffusivity by 3 - 4 orders of magnitude along the GBs (D_gb). At 350 °C, the oxygen tracer diffusion coefficient (D*) is measured as 2.5 × 10^-14</

SUBMITTER: Sha Z 

PROVIDER: S-EPMC11636158 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature