Volume 57, Issue 50 pp. 16525-16528
Communication

The Chemical Properties of Hydrogen Atoms Adsorbed on M0-Nanoparticles Suspended in Aqueous Solutions: The Case of Ag0-NPs and Au0-NPs Reduced by BD4

Alina Sermiagin

Alina Sermiagin

Chemical Sciences Department, Ariel University, Kyriat Hamada 3, Ariel, 40700 Israel

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Prof. Dr. Dan Meyerstein

Prof. Dr. Dan Meyerstein

Chemical Sciences Department, Ariel University, Kyriat Hamada 3, Ariel, 40700 Israel

Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva, 84105 Israel

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Dr. Ronen Bar-Ziv

Dr. Ronen Bar-Ziv

Chemistry Department, Nuclear Research Centre Negev, Beer-Sheva, 84190 Israel

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Dr. Tomer Zidki

Corresponding Author

Dr. Tomer Zidki

Chemical Sciences Department, Ariel University, Kyriat Hamada 3, Ariel, 40700 Israel

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First published: 15 October 2018
Citations: 20

Graphical Abstract

The nature of H-atoms adsorbed on metal nanoparticles (NPs) is of major importance in many catalyzed reduction processes. The H-atoms of the transient {(M0-NP)-Hn}n behave mainly as hydrides when n is large (the Heyrovsky mechanism), and as atoms when n is small (the Tafel mechanism). The relative contributions of the two mechanisms differ considerably for Au and Ag-NPs.

Abstract

The nature of H-atoms adsorbed on M0-nanoparticles is of major importance in many catalyzed reduction processes. Using isotope labeling, we determined that hydrogen evolution from transient {(M0-NP)-Hn}n proceeds mainly via the Heyrovsky mechanism when n is large (i.e., the hydrogens behave as hydrides) but mainly via the Tafel mechanism when n is small (i.e., the hydrogens behave as atoms). Additionally, the relative contributions of the two mechanisms differ considerably for M=Au and Ag. The results are analogous to those recently reported for the M0-NP-catalyzed de-halogenation processes.

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