Hydrogenation of HOPG-supported Gold Nanoparticles: Features of Initial Stages

Abstract

The features of deuterium adsorption on the surface of gold nanoparticles deposited on highly oriented pyrolytic graphite (HOPG) were determined. The results showed that deuterium adsorption on gold nanoparticles takes place at room temperature. The results also showed that the filling of the nanoparticles’ surfaces with the adsorbate occurs from the graphite–gold interface until the entire surface is covered by deuterium. The results of quantum chemical simulations are used to explain the experimental data. A simple model of the observed effects is proposed.

Less and Less Noble: Local Adsorption Properties of Supported Au, Ni, and Pt Nanoparticles

“…The situation changes if we consider nanostructured gold. Against the backdrop of the d-band states, the surface states begin to manifest themselves clearly (see Figure 4a) [20]. These surface sp-states contribute significantly to M-A ads chemical bonding and lead to the formation of occupied σ spa and empty σ* spa orbitals.…”

“…We do not discuss in detail the experiments with gold nanoparticles and various gas reagents, as such discussions can be found in our previous works [17,20]. We only want to note the high reproducibility of the results obtained.…”

“…But why is the surface distribution of Au-H so uneven? In our previous works, we considered the possibility of the formation of such a complex [20], but the locality of this process cannot be explained by charge effects alone. After all, the charging of a supported nanoparticle due to the difference in the electron work functions is too global a phenomenon.…”

Oxidation of Supported Nickel Nanoparticles at Low Exposure to O2: Charging Effects and Selective Surface Activity

“…Such result has demonstrated the ability to control the rate of hydrogenation and demonstrates a very good agreement with other works [ 9 ]. At the same time, the interaction of gold nanoparticles with the support and consequent charge redistribution result in the selective surface activity in the hydrogenation of gold nanoparticles [ 10 ]. Charge redistribution also significantly influences the orientation of polar gas molecules and, consequently, the reaction rate.…”

“…Additionally, even more, some catalytic effects were shown to be explained only by the charge redistribution influenced by the electrochemical environment [ 12 ]. Previously, we have already studied gas reactions over Ni-based nanostructured elements of bicomponent coatings [ 13 ], but recent experiments with gold nanoparticles [ 10 ] have also indicated the urgency to study the initial stages of the nickel nanoparticles oxidation.…”