Figures & data
Figure 1. HAADF-STEM images of (a) Au 1.0/Pd 0, (b) Au 0.75/Pd 0.25, (c) Au 0.50/Pd 0.50, (d) Au 0.25/Pd 0.75 and (e) Au 0/Pd 1.0 bimetallic NP-immobilised TiO2.
Table 1. Structures of immobilised Au/Pd bimetallic NPs. Insets are the image intensity profiles along the indicated lines.
Figure 2. (a) IR spectra of CO adsorbed on Au/Pd bimetallic NP-immobilised TiO2 and (b) the relationship between the surface areas of the immobilised NPs and the peak areas of adsorbed CO.
Figure 3. TOF (per Au + Pd) of (a) Au-core/Pd-shell bimetallic NPs and (b) mixture of monometallic Au and Pd NP-immobilised TiO2 (left axis) and (c) synergistic factor (histogram, right axis).
Figure 4. Catalytic activities normalised by the surface area of immobilised (a) Au-core/Pd-shell bimetallic NPs and (b) mixture of monometallic Au and Pd NPs.
Figure 5. (a) Pd 3d and (b) Au 4f XPS spectra of Au-core/Pd-shell bimetallic NPs immobilised on TiO2.
Table 2. HAADF-STEM images and the sizes of TiO2 immobilising Au/Pd bimetallic NPs prepared from 0.25 mM HAuCl4 and various concentrations of Na2PdCl4.
Figure 6. Dependences of catalytic activities on the Pd-shell thickness. (▪; left axis): normalised AN formation rate, (○; right axis): TOF.
