Speaker
Description
Rapid deactivation presently limits a widespread use of high-temperature solid oxide cells (SOCs) as otherwise highly efficient chemical energy converters. With deactivation triggered by the ongoing conversion reactions, an atomic-scale understanding of the active triple-phase boundary between electrolyte, electrode, and gas phase is essential to increase cell performance.
Here, a multi-method approach is used comprising transmission electron microscopy, X-ray spectroscopy, and first-principles calculations and molecular simulations to untangle the atomic arrangement of the prototypical SOC interface between a lanthanum strontium manganite (LSM) anode and an yttria-stabilized zirconia (YSZ) electrolyte in the as-prepared state after sintering. An interlayer of self-limited width is identified exhibiting partial amorphization and strong compositional gradients. Such a structural component shows the characteristics of a complexion that is stabilized by the confinement between two bulk phases.
This offers a new perspective to understand the function of SOCs at the atomic scale. Moreover, it opens up a hitherto unrealized design space to tune the conversion efficiency.
