High-spatial-resolution mapping of catalytic reactions on single particles

Wu, Chung-Yeh; Wolf, William J.; Levartovsky, Yehonatan; Bechtel, Hans A.; Martin, Michael C.; Toste, F. Dean; Gross, Elad

doi:10.1038/nature20795

Title: High-spatial-resolution mapping of catalytic reactions on single particles

Journal Article · 26 January 2017 · Nature (London)

DOI: https://doi.org/10.1038/nature20795 · OSTI ID:1439214

Wu, Chung-Yeh ^[1]; Wolf, William J. ^[1]; Levartovsky, Yehonatan ^[2]; Bechtel, Hans A. ^[3]; Martin, Michael C. ^[3]; Toste, F. Dean ^[1]; Gross, Elad ^[2]

Univ. of California, Berkeley, CA (United States). Department of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Hebrew Univ. of Jerusalem (Israel). Institute of Chemistry and The Center for Nanoscience and Nanotechnology
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

We report the critical role in surface reactions and heterogeneous catalysis of metal atoms with low coordination numbers, such as found at atomic steps and surface defects, is firmly established. But despite the growing availability of tools that enable detailed in situ characterization, so far it has not been possible to document this role directly. Surface properties can be mapped with high spatial resolution, and catalytic conversion can be tracked with a clear chemical signature; however, the combination of the two, which would enable high-spatial-resolution detection of reactions on catalytic surfaces, has rarely been achieved. Single-molecule fluorescence spectroscopy has been used to image and characterize single turnover sites at catalytic surfaces, but is restricted to reactions that generate highly fluorescing product molecules. Herein the chemical conversion of N-heterocyclic carbene molecules attached to catalytic particles is mapped using synchrotron-radiation-based infrared nanospectroscopy with a spatial resolution of 25 nanometres, which enabled particle regions that differ in reactivity to be distinguished. Lastly, these observations demonstrate that, compared to the flat regions on top of the particles, the peripheries of the particles-which contain metal atoms with low coordination numbers-are more active in catalysing oxidation and reduction of chemically active groups in surface-anchored N-heterocyclic carbene molecules.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1439214

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 7638 Vol. 541; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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