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Preparation, Surface Assembly of Pt Nanoparticles with Different Agglomeration States and Investigation of Their Electrochemical and Particular IR Properties

Author: ChenWei
Tutor: SunShiGang
School: Xiamen University
Course: Physical and chemical
Keywords: Pt nanoparticles Surface mount In situ infrared spectroscopy
CLC: O614
Type: PhD thesis
Year: 2003
Downloads: 400
Quote: 1
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Abstract


Nanomaterials have many special nature different from conventional materials, has aroused widespread interest in materials, chemistry, physics, biology, engineering and many other disciplines, is the core issue of nanotechnology. PGMs as a catalyst for high catalytic activity and stability, performance, widely used in the important areas of energy conversion, green synthesis. Development of nano-scale metal material electro-catalyst is one of the electrocatalytic the hot topic. In this thesis, the chemical synthesis of Pt nanoparticles (Pt n ). UV-vis spectroscopy and TEM study showed that, Pt n mainly in the initial stage of forming heated to reflux. Dithiol synthesis of Pt n assembled onto a gold substrate, Fe (CN) 6 4-/3- redox reaction as a probe to study the electronic conduction in the assembly process, the results indicate that the the dithiol monolayer to hinder Au substrate with Fe (CN) 6 4-/3- n , makes the electronic transfer capacity due to quantum tunneling effect. By AFM and XPS analysis of the surface morphology and composition of the assembly system. Situ FTIRS and CV results show that, compared with the body PT adsorbed on Pt n of CO significantly enhanced infrared absorption. Meanwhile, due to the surface effect, and the small size effect, the higher the oxidation potential of the CO in the Pt n , showing more adsorption state. This article was first discovered in a discrete state, both in the solid / liquid or solid / gas interface, Pt nanoparticles exhibit enhanced infrared absorption, and the the Pt nanoparticles reunion abnormal infrared effects. This article is also the first time the use of infrared performance transmission infrared spectra of the different state of aggregation Pt nanoparticles. The results showed that the adsorption of CO molecules with the state of aggregation of Pt nanoparticles dispersed state to varying degrees, the infrared absorption characteristics are given enhanced infrared absorption spectrum, and then to the conversion of the abnormal infrared effects to Fano type. Further evidence of abnormal infrared effects is the nanomaterials inherent universal phenomenon and is closely related to the size and state of aggregation of the nanomaterials. The study also found that the reunion state Pt nanoparticles with better electrocatalytic properties for methanol oxidation. The results of this thesis is of great significance for the in-depth understanding of abnormal infrared effects of metal nanoparticles performance as well as explore the root causes of, and developed a direct fuel cell catalyst applications.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds
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