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Synthesis of Carbon Nanotubes and Their Electrocatalytic Properties for Alcohol Electrooxidation

Author: ZhangChunFang
Tutor: LiFeng
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Hydrotalcite Carbon nanotubes Chemical vapor deposition method Pt / CNTs electro-catalyst Methanol, ethanol electrocatalytic
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 161
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Abstract


Carbon nanotube has a unique physical and chemical properties, excellent conductive properties, corrosion resistance, high stability, and is widely used in the field of catalysis, the semiconductor field, the field of energy storage material, the field of super-capacitors, biological sensors, etc., there are very broad application prospects. Nanotube synthesis by chemical vapor deposition method, synthesis catalysts, carbon source gas, the reaction temperature, reaction time, carrier gas, and many other factors, wherein the catalyst is the chemical composition, type, and particle size is the most important influencing factors. The different catalyst will affect the morphology and structure of carbon nanotubes, and ultimately affect the performance and applications of carbon nanotubes. Layered double hydroxides LDHs as a highly ordered structure of the two-dimensional sheet material, can ensure a uniform distribution of metal ions in the main laminates, but remain in the calcinated metal particles and precursor same height The orderly arrangement. Therefore, the obtained composite metal oxide can use calcined catalyst as CNTs grown uniform diameter, the carbon nanotube of high degree of graphitization. This article using hydrotalcite laminates composed of the tunable degeneration and the uniformity of the overall structure of the advantages proposed by using the hydrotalcite as a new method of growing the carbon nanotubes of the catalyst precursor. To the shelves on the introduction of metal species such as Co, Cu, Mg, is formed having a uniform structure and composition of the precursor of the functional activity of the-LDHs, will be restored after the calcined product as a catalyst for the growth of the carbon nanotubes using a chemical vapor deposition method. (A) the Cu doped Co-based Carbon Nanotubes study the use of single drops were prepared before the series of different the Co2 / Cu2 proportion of CoCuAl-LDHs body calcinations composite metal oxide LDO. The growth of the carbon nanotubes using chemical vapor deposition (CVD), in different growth Atmosphere. The effects of different Cu addition amount and different CNTs growth Atmosphere on the dimensions of the morphology of the grown carbon material, Yield. The study found that the amount of various Cu mainly affect the morphology of the carbon nanotubes, the growth atmosphere affect the degree of graphitization of CNTs and yield. This method can achieve controlled growth of carbon nanotubes morphology. (B) Mg-doped Carbon Nanotubes research of Co-based urea prepared a series of different Co2 / Mg2 proportion CoMgAl-LDHs precursor composite metal oxide LDO calcinations. Calcined product LDO catalyst precursor, the growth of the carbon nanotubes using chemical vapor deposition (CVD) method. The different the Co2 / Mg2 proportion to the growth of carbon nanotube morphology, degree of graphitization and surface chemical composition of the impact. The study found that the method to get a high yield and a high degree of graphitization straight-walled carbon nanotubes, this method is simple, environmentally friendly and can be used for industrial production. This paper systematically studied the electrocatalytic properties of carbon nanotubes on the oxidation of alcohols. Experiment was prepared by the Co-based carbon nanotubes as catalyst support, design Pt / CNTs composite electro-catalyst electro-catalytic oxidation of methanol and ethanol between different doping system CNTs performance differences investigated doping amount of electro-catalytic activity and anti-poisoning ability. The study found that the addition of Cu and Mg were significantly improved catalytic mechanism of Pt / CNTs electro-catalyst for the electro-catalytic activity of alcohols and anti-poisoning ability, and explain alcohol oxidation.

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