Surface reconstruction of Pt nanocrystals interacting with gas atmosphere. Bridging the pressure gap with in situ diffractionPiotr Rzeszotarski, Zbigniew Kaszkur
- Physical Chemistry Chemical Physics, January 2009, Royal Society of Chemistry
- DOI: 10.1039/b820510h
What is it about?
It is the first observation of surface reconstruction via in situ diffraction. The reconstruction occurs on nanocrystalline Pt supported on silica during hydrogen desorption. The process could be monitored due to its rate limited by the reverse spill-over of atomic hydrogen to associate and desorb from Pt.
Why is it important?
The paper shows possibility that many chemical/physical phenomena in nanocrystalline environment run in conditions far from thermodynamic equilibrium and processes can be controlled more by kinetics than thermodynamics. Also the elementary surface chemical reactions in heterogenous catalysis may run on the surface structured differently than the surface of a cut of the bulk structure.