Resolving multifrequential oscillations and nanoscale interfacet communication in single-particle catalysis
Artikel i vetenskaplig tidskrift, 2021

In heterogeneous catalysis research, the reactivity of individual nanofacets of single particles is typically not resolved. We applied in situ field electron microscopy to the apex of a curved rhodium crystal (radius of 650 nanometers), providing high spatial (∼2 nanometers) and time resolution (∼2 milliseconds) of oscillatory catalytic hydrogen oxidation, to image adsorbed species and reaction fronts on the individual facets. Using ionized water as the imaging species, the active sites were directly imaged with field ion microscopy. The catalytic behavior of differently structured nanofacets and the extent of coupling between them were monitored individually. We observed limited interfacet coupling, entrainment, frequency locking, and reconstruction-induced collapse of spatial coupling. The experimental results are backed up by microkinetic modeling of time-dependent oxygen species coverages and oscillation frequencies.

Författare

Y. Suchorski

Technische Universität Wien

Johannes Zeininger

Technische Universität Wien

S. Buhr

Technische Universität Wien

M. Raab

Technische Universität Wien

M. Stoger-Pollach

Technische Universität Wien

J. Bernardi

Technische Universität Wien

Henrik Grönbeck

Chalmers, Fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

G. Rupprechter

Technische Universität Wien

Science

0036-8075 (ISSN)

Vol. 372 6548 1314-1318

Ämneskategorier

Oorganisk kemi

Atom- och molekylfysik och optik

Annan kemi

DOI

10.1126/science.abf8107

PubMed

34016741

Mer information

Senast uppdaterat

2021-06-29