研究目的
Investigating the facet-dependent sintering behaviours of Au nanoparticles on distinct anatase TiO2 surfaces to understand the role of metal-support interactions in the sintering process.
研究成果
The study revealed a facet-dependent sintering behavior of Au-TiO2 nanocatalysts, with sintering observed on TiO2 (101) surface but not on TiO2 (001) surface. DFT calculations explained this behavior by the different adsorption energies and diffusion barriers of Au adatom on the two surfaces. This work provides clear evidence of the substrate effects on the sintering of supported NPs and insights for designing efficient sintering-resistant catalysts.
研究不足
The reduction level of the TiO2 supports by the electron beam irradiation could affect the sintering of supported metal NPs. A fairly low electron beam dose was used to minimize this effect.
1：Experimental Design and Method Selection:
In situ TEM was used to visualize the sintering processes of Au nanoparticles on TiO2 (101) and (001) surfaces. Density function theory (DFT) calculations were performed to explain the facet-dependent sintering behavior.
2：Sample Selection and Data Sources:
Well-defined Au-TiO2 (101) and Au-TiO2 (001) model catalysts were prepared by loading Au nanoparticles on two typical anatase TiO2 supports through impregnation and in situ annealing methods.
3：List of Experimental Equipment and Materials:
Transmission electron microscopy (TEM), environmental transmission electron microscopy (ETEM), spherical aberration corrected scanning transmission electron microscopy (STEM).
4：Experimental Procedures and Operational Workflow:
The samples were heated to 500 °C at an oxygen environment (5×10-2 Pa) for in situ observation. A low electron beam dose was used to observe the intrinsic structure of Au-TiO2 catalysts.
5：Data Analysis Methods:
The projection area (PA) of each NP was estimated to quantify the NP size. DFT calculations were used to analyze the adsorption energies and diffusion barriers of Au adatom on different surfaces.
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