Cubo-octahedral Pt nanoparticles

FIGURE 3.13 A 3D map of the adsorption energy of atomic oxygen (in eV) at the surface of a hemispherical cubo-octahedral Pt nanoparticles with 92 atoms. 

Figure 20 Left High-resolution transmission electron micrograph image of a single PtMo (3 1) nanoparticle on the edge of a carbon black primary particle (111) and (100) fades are clearly resolved. Right Distribution Pt (light) and Mo (dark) atoms in an fee cubo-octahedral particle containing 1806 Pt atoms and 600 Mo atoms from classical Monte Carlo simulation at 550 K.

A prevailing view of carbon-supported metal nanoparticles is that they are in a form of cubo-octahedral or icosohedral structures.One such model for the active electrocatalyst with submonolayer Pt coverage, a cubo-octahedral Ru particle with Pt islands on its surface, is shown as an inset in Fig. 18b. Pt atoms are in 2D islands as expected from EXAFS measurements and the Ru nanoparticles are supported on a high surface area Vulcan XC-72 carbon. 

Fig. 21.4 Particle-size-dependent surface strain for Pt, An, and Pd nanoparticles on different facets and edges of cubo-octahedral particles. The particles 111 and 100 facets and edges (in gray) are illustrated in the inset in the upper left corner [122]...

Regrading the catalyst particle geometry, while nanoparticles are commonly described by the cubo-octahedral model [219], recently Tian et al. developed an electrochemical method for the surface design of tetrahexahedral Pt nanocrystals (Figure 4.46) [220]. A square wave potential function (between -0.20 V vs. SCE and +1.20 V vs. SCE with a frequency of 10 Hz) was applied to electrodeposited Pt... 

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