The substance of the BSCF perovskite’s great performance, therefore, is still unknown.
The researchers looked at the oxygen permeation mechanism and discovered that adding Ba to perovskite oxides could speed up the kinetics of the oxygen surface exchange reaction.
Researchers used environmental electron microscopy to identify the precipitation of BaOx nanoparticles on the surface of BSCF materials in a high-temperature oxygen atmosphere, proving that Ba-containing materials can be prompted or disintegrated into BaOx, which has high catalytic activity for the oxygen setup process.
Furthermore, researchers discovered that the precipitated BaOx nanoparticles could lower the energy stoppers of oxygen molecule adsorption and detachment in the oxygen reduction and oxygen desorption processes of the oxygen evolution process, thus speeding up the oxygen exchange reaction kinetics at the gas-solid interface, using DFT calculations.
This study provides a scientific basis for the design of oxygen-permeable membranes and electrocatalytic materials.
Weishen Yang, Professor, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
The China Postdoctoral Foundation, the National Natural Science Foundation of China, and the CAS Pilot Project funded the research.
Journal Reference:
Zhu, Y., et al. (2022) Oxygen activation on Ba-containing perovskite materials. Science Advances. doi.org/10.1126/sciadv.abn4072.