Well-defined nanocrystals as active catalysts and premier materials for spectroscopic studies of surface processes | |
Presenter | Matteo Cargnello, Stanford University |
Session Title | Scientific Opportunities with PS-Pulses at SSRL |
Abstract |
A variety of uniform nanocrystals (NCs) and heterostructured materials with different sizes, shapes, and compositions can be prepared with nanometer precision using surfactant-assisted organic- or aqueous-based techniques. This nanoscale control over a wide variety of different crystallographic surfaces and compositions is very appealing for catalytic studies because it allows accurate structure-activity relationships and mechanisms to be made. Studying finely controlled NC systems is important for answering fundamental questions that could allow the preparation of more active catalysts. These well-defined systems are also very active catalysts, due to the increased density of In addition to the above mentioned advantages in catalytic processes, the high uniformity allows to use ensemble-averaged techniques such as x-ray spectroscopies to obtain reliable information about the entire sample under investigation. This aspect is a great advantage given the opportunity to merge microscopic and macroscopic information with catalytic data to derive in-depth knowledge of catalytic active sites. In this contribution, selected examples of nanostructured catalysts made from well-defined nanocrystals will be presented, together with opportunities in using time-resolved ultrafast techniques to investigate catalytic processes at the nanoscale with consequences for the overall performance of the samples. Catalytic applications include activation of strong C-H and C=O bonds, photocatalytic transformations for sustainable production of hydrogen, and fundamental studies on catalytic reactions for pollution control. |