吸附在水溶液中悬浮的M纳米颗粒上的氢原子的化学性质：以硼氢化钠还原的银纳米颗粒和金纳米颗粒为例

The Chemical Properties of Hydrogen Atoms Adsorbed on M -Nanoparticles Suspended in Aqueous Solutions: The Case of Ag -NPs and Au -NPs Reduced by BD.

作者信息

Sermiagin Alina, Meyerstein Dan, Bar-Ziv Ronen, Zidki Tomer

机构信息

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

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

出版信息

Angew Chem Int Ed Engl. 2018 Dec 10;57(50):16525-16528. doi: 10.1002/anie.201809302. Epub 2018 Nov 15.

DOI:10.1002/anie.201809302

PMID:30320944

Abstract

The nature of H-atoms adsorbed on M -nanoparticles is of major importance in many catalyzed reduction processes. Using isotope labeling, we determined that hydrogen evolution from transient {(M -NP)-H } 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 -NP-catalyzed de-halogenation processes.

摘要

吸附在M纳米颗粒上的氢原子的性质在许多催化还原过程中至关重要。通过同位素标记，我们确定当n较大时（即氢表现为氢化物），瞬态{(M-NP)-H}的析氢主要通过海洛夫斯基机制进行，而当n较小时（即氢表现为原子），则主要通过塔菲尔机制进行。此外，对于M = Au和Ag，这两种机制的相对贡献有很大差异。这些结果与最近报道的M-NP催化的脱卤过程的结果相似。