The influence of the support (Al2O3, CeO2, TiO2) in oxidation benzyl alcohol (BA) to benzaldehyde on Ir-based catalysts was investigated by ATR-IR spectroscopy tandem with modulation excitation (ATR-IR-MES) at working conditions catalysts. ATR-IR-MES unveiled dissociative adsorption BA and formation adsorbed transient alkoxy species (C6H5CH2O) be key for high catalytic performance. These were d...

It is demonstrated that the support effects play a crucial role in the gold nanocatalysis. Two types of support are considered—the “inert” support of hexagonal boron nitride (h-BN) with the N and B vacancy defects and the “active” support of rutile TiO2(110). It is demonstrated that Au and Au2 can be trapped effectively by the vacancy defects in h-BN. In that case, the strong adsorption on the ...

Since their introduction by Haruta, oxide supported Au catalysts with Au nanoparticles (NPs) of few nanometers in diameter have attracted enormous interest because of their high activity for various oxidation and reduction reactions most prominently the CO oxidation reaction. Mechanistic details and hence the physical origin of their high activity, however, are still controversial. Focusing on ...

Abstract The inverse perovskite Sr 3 SnO is a 3D cubic Dirac semimetal with very small energy gap[1]. Its unusual electronic structure confers variety of novel properties, such as chiral topological surface states, and strong itinerant electron orbital magnetism. Remarkably, when doped it also becomes superconducting[2]. In the lowest carrier density samples, Fermi level lies close to points, m...

We determined the structure of epitaxial $2H\text{\ensuremath{-}}\mathrm{Ta}{\mathrm{S}}_{2}$ on Au(111) using method x-ray standing waves (XSW), supported by density functional theory (DFT) calculations and scanning tunneling microscopy (STM). The lattice mismatch between substrate overlayer gives rise to a moir\'e superstructure, which modulates structural electronic properties. For specific ...

Electrocatalysis: A comparative study of the electrocatalytic activity LDHs (NiFe-LDH, CuFe-LDH) and TiO2 supported metal nanoparticles (Au−TiO2, Pd−TiO2) upon electroreduction a model compound, 4-nitrophenol(4-NP), potential environmental pollutant, in an aprotic solvent system (TBAPF6/ACN) was reported for first time. Hence its mitigation is interest science that applicable future technologies.

The unique catalytic activity of supported Au nanoparticles has been ascribed to various effects including thickness/shape, the metal oxidation state, and support effects. Previously, we reported the synthesis of ordered Au monolayers and bilayers on TiO(x), with the latter being significantly more active for CO oxidation than the former. In the present study, the electronic and chemical proper...

The activity of Au nanoparticle-loaded P25 TiO2 (Au/P25) plasmonic photocatalysts, evaluated by the oxidative decomposition of formic acid in water under visible light irradiation, was enhanced up to 3 times by simply mixing Au/P25 with photocatalytically inactive h-BN nanosheets as a result of electron transfer from photoexcited Au/TiO2 to the h-BN nanosheets and retardation of the charge reco...

Au photosensitization can endow TiO2 visible-light-driven photocatalytic properties. Herein, via facet-optimized brookite TiO2 with tunable electronic band structures as the substrate, we found that intense visible light excitation of Au will result in the accumulation of hot-electrons, which will negatively shift the EF of Au and lower the Schottky barrier, thus ensuring their consecutive inje...

Introduction Bulk gold is a chemically inert metal, and had previously been disregarded as a candidate for catalytic applications [1]. Haruta’s pioneering work [2] showed exceptional reactivity on gold nanoparticles of 2-5 nm in diameter. Among reactions, the low temperature CO oxidation [3] on Au has created a strong interest. Model catalyst samples, which consist of planar metal oxide surface...