Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/79058
Title: Highly active, selective, and stable direct H2O2 generation by monodispersive Pd-Ag nanoalloy
Authors: Zhang, J
Huang, BL 
Shao, Q
Huang, XQ
Keywords: Bimetallic
Palladium
Silver
Electron transfer
Hydrogen peroxide
Issue Date: 2018
Publisher: American Chemical Society
Source: ACS applied materials and interfaces, 27 June 2018, v. 10, no. 25, p. 21291-21296 How to cite?
Journal: ACS applied materials and interfaces 
Abstract: Hydrogen peroxide (H2O2), a green oxidant, has wide applications in various chemical syntheses and is also a promising candidate to replace the traditional toxic oxidants. The direct synthesis of H2O2 from H-2 and O-2 is a potential approach, as it is a green and atomically economic reaction. However, the most previous systems are notorious in complicated post-purification procedures, high energy cost, and low selectivity because of the uncontrollable O-O bond cleavage. We have solved this challenge by tuning the chemical state of Pd with high H2O2 productivity of 80.4 mol kg(cat)(-1) h(-1) and high H2O2 selectivity of 82.1% via the design of Pd-Ag nanoalloys with flexibly tuned size and composition. The created Pd-Ag nanoalloy also exhibits excellent stability with limited performance decay over recycles. The X-ray photoelectron spectroscopy analysis confirms the electron transfer from Ag to Pd, which generates more Pd and enables improved H2O2 productivity. The theoretical calculation shows that the incorporation of Ag into Pd is beneficial for the stabilization of O-2(2-) and the cleavage of H-2 for the enhanced H2O2 generation. In addition, the enhanced H2O2 desorption on Pd-Ag nanoalloy is beneficial for releasing H2O2, which results in the increased H2O2 selectivity.
URI: http://hdl.handle.net/10397/79058
ISSN: 1944-8244
EISSN: 1944-8252
DOI: 10.1021/acsami.8b03756
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