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Electrochemical and SERS Studies of C1 Molecules at Au Hollow Nanospheres Modified Electrode

Author: WuZhiXiang
Tutor: ZhongQiLing
School: Jiangxi Normal University
Course: Organic Chemistry
Keywords: Transition metal catalyst Original battery substitution reaction Cyclic voltammetry ( CV ) In situ SERS technology Fuel cell
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 59
Quote: 0
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Abstract

Improve the catalytic activity of transition metals (such as Pt) one of the commonly used method is to make nano, but due to the nanoparticle surface energy, easy reunion inactivation, poor stability, short life, despite its load high surface area carbon to curb its inactivation reunion, but the stability and service life is still not ideal. Happily, in recent years, it was found that the hollow metal nanostructures materials exhibit superior performance of metal than the metal particles themselves not only within a certain range, but also because the shell structure constructed by the metal nano-particles (e.g. ATC and empty ball) has potential applications in many fields such as pharmaceutical, biotechnology, chemical, and thus much of the extensive attention from researchers. Template Synthesis of transition metal HollowNanosphere reaction process, the transition metal ion is first substitution reaction with the original battery also serves as the chemical and physical effects of the template (such as Se ball), also added a reducing agent. Deposited through these two ways the template surface transition metal (Pt) nanoparticles large surface area and high surface energy, and the template to form a continuous and uniform spherical core-shell structure and reduce the trend of the spherical shell surface area, and thus to reduce its surface energy. And this trend has also been accompanied by chemical or physical methods In addition to the core of the entire process, until the surface area of ??the shell tends to a minimum, the surface can be reduced to a minimum, to achieve energy balance, is formed hollow, the stability of the porous shell structure. Porous HollowNanosphere not only structural stability and density, large surface area, monodisperse, controllable particle size, shell thickness, composition adjustable, is the ideal catalyst to build a new type of nano-structured electrode materials. Bai Chunli, WAN Li-jun Task Force and the group's findings, the Pt HollowNanosphere electrocatalytic activity for methanol oxidation than Pt solid nanoparticles. Yan et al's findings also showed that Pt and Pt-Pd nanotubes catalytic activity and stability for oxygen reduction reaction than Pt black and carbon supported Pt. This thesis the amorphous selenium sol as a template, ascorbic acid as a reducing agent, were synthesized by conventional electrochemical methods gold, platinum and gold - the platinum alloy HollowNanosphere its modified electrode using cyclic voltammetry (CV) and electrochemical original The bit SERS technology explored different HollowNanosphere modified electrode in different media, methanol, formic acid and other small organic molecules C1 electro-catalytic oxidation process for the development of fuel cells added some reference from the information.

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