Understanding electrochemical switchability of perovskite-type exsolution catalysts.

ABSTRACT: Exsolution of metal nanoparticles from perovskite-type oxides is a very promising approach to obtain catalysts with superior properties. One particularly interesting property of exsolution catalysts is the possibility of electrochemical switching between different activity states. In this work, synchrotron-based in-situ X-ray diffraction experiments on electrochemically polarized La_0.6Sr_0.4FeO_3-δ thin film electrodes are performed, in order to simultaneously obtain insights into the phase composition and the catalytic activity of the electrode surface. This shows that reversible electrochemical switching between a high and low activity state is accompanied by a phase change of exsolved particles between metallic α--Fe and Fe-oxides. Reintegration of iron in

SUBMITTER: Opitz AK 

PROVIDER: S-EPMC7511332 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature