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The Chemical Properties of Hydrogen Atoms Adsorbed on M 0 ‐Nanoparticles Suspended in Aqueous Solutions: The Case of Ag 0 ‐NPs and Au 0 ‐NPs Reduced by BD 4 −
Author(s) -
Sermiagin Alina,
Meyerstein Dan,
BarZiv Ronen,
Zidki Tomer
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201809302
Subject(s) - adsorption , chemistry , aqueous solution , nanoparticle , hydrogen , catalysis , kinetic isotope effect , halogenation , tafel equation , inorganic chemistry , crystallography , materials science , deuterium , nanotechnology , electrochemistry , organic chemistry , physics , atomic physics , electrode
The nature of H‐atoms adsorbed on M 0 ‐nanoparticles is of major importance in many catalyzed reduction processes. Using isotope labeling, we determined that hydrogen evolution from transient {(M 0 ‐NP)‐H n } 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 M 0 ‐NP‐catalyzed de‐halogenation processes.