Shape-Dependent Catalytic Properties of Pt Nanoparticles

Abstract

Tailoring the chemical reactivity of nanomaterials at the atomic level is one of the most important challenges in catalysis research. In order to achieve this elusive goal, fundamental understanding of the geometric and electronic structure of these complex systems at the atomic level must be obtained. This article reports the influence of the nanoparticle shape on the reactivity of Pt nanocatalysts supported on γ-Al(2)O(3). Nanoparticles with analogous average size distributions (∼0.8-1 nm), but with different shapes, synthesized by inverse micelle encapsulation, were found to display distinct reactivities for the oxidation of 2-propanol. A correlation between the number of undercoordinated atoms at the nanoparticle surface and the onset temperature for 2-propanol oxidation was observed, demonstrating that catalytic properties can be controlled through shape-selective synthesis.

Thermodynamic properties of Pt nanoparticles: Size, shape, support, and adsorbate effects

“…Further details on the sample preparation method and synthesis parameters can be found in Refs. 28,38,[41][42][43][44] and Table I. Table I.…”

“…50 Quantitative determination of the NP shape was carried out by analyzing low temperature EXAFS data up to the 4 th nearest neighbor contribution, including multiple scattering (MS), as described in Refs. 38,43 and references therein. The data were acquired in H 2 after NP reduction.…”

“…can be found in Refs. 28,43 A comparison of the EXAFS and model coordination numbers for the two NP shapes that best represented S1 is shown in Suppl. Table III.…”

Exploring the phase space of time of flight mass selected PtxY nanoparticles

“…Improvements can be made to catalysts by forming non-equilibrium morphologies. 14,38,[49][50][51][52][53] Very recent results by Chen et al 13 have shown unprecedented capabilities of Pt x Ni ''nanoframes'' to catalyze oxygen reduction.…”

Local Structural Distortion Induced Uniaxial Negative Thermal Expansion in Nanosized Semimetal Bismuth

“…Abnormal expansion behavior manifests different local structure in bismuth nanoparticles than that in bulk ones. In order to reveal the origin of this kind of unusual thermal expansion behaviors in nanosized bismuth, local structural information was extracted from EXAFS for its atomic selectivity and high sensitivity to the short‐range structure 31, 32, 33…”