Single-Particle Catalysis: Revealing Intraparticle Pacemakers in Catalytic H₂ Oxidation on Rh.

ABSTRACT: Self-sustained oscillations in H₂ oxidation on a Rh nanotip mimicking a single catalytic nanoparticle were studied by in situ field emission microscopy (FEM). The observed spatio-temporal oscillations result from the coupling of subsurface oxide formation/depletion with reaction front propagation. An original sophisticated method for tracking kinetic transition points allowed the identification of local pacemakers, initiating kinetic transitions and the nucleation of reaction fronts, with much higher temporal resolution than conventional processing of FEM video files provides. The pacemakers turned out to be specific surface atomic configurations at the border between strongly corrugated Rh{973} regions and adjacent relatively flat terraces. These structural ensembles are

SUBMITTER: Zeininger J 

PROVIDER: S-EPMC8353627 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature