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Study on Electrocatalytic Oxidation of Low Carbon Alcohols at Pd Nanoparticle Modified Indium Tin Oxide Electrode

Author: MaXuWen
Tutor: DongChuan
School: Shanxi University
Course: Analytical Chemistry
Keywords: ALCOHOLS Electrocatalytic oxidation Palladium Indium tin oxide Cyclic voltammetry
CLC: TM911.4
Type: Master's thesis
Year: 2009
Downloads: 59
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Abstract


The direct methanol fuel cells (Direct alcohol fuel cell, is abbreviation for DAFC) as a new type of green energy, with epochal significance of solving these two problems the world is facing energy shortage and environmental pollution. ITO conductive glass is a novel electrode material having good conductivity and large surface area, it can serve as a carrier of the precious metal nanomaterials, greatly improving the utilization of the catalyst. Based on palladium nano particles high adsorption characteristics of high specific surface area, high electrocatalytic activity, this thesis prepared by cyclic scan SYSTEM high electrical activity, the high sensitivity of palladium nano-modified indium tin oxide (Pd NPs / ITO) electrode, and Electrocatalytic Oxidation of lower alcohols (including methanol, ethanol, propanol, etc.) applied. Chapter I: Introduction to direct alcohol fuel cell development, palladium nano-modified electrodes in the electrocatalytic oxidation of alcohol research progress are reviewed. Chapter II: successfully prepared by chemical deposition method and cyclic voltammetry Pd NPs / ITO electrode. Investigated by cyclic voltammetry standard redox the electricity [Fe (CN) 6 of] 4 - / [Fe (CN) 6 ] 3 - electrocatalytic activity and the use of scanning electron microscopy to characterize the morphology of the surface of the electrode. In addition, analysis of the electrode potential within the electrochemical reaction process as well as the reaction temperature, nitrogen and electrode placement electrochemical detection. The results show that: the introduction of the ITO conductive film of glass greatly enhance the utilization of electro-catalyst Pd nanometers, so that the PD NPS / ITO electrode has a good electrical activity; seen by different potentials within the electrode in an alkaline solution of the cyclic voltammetric behavior by the size of the scanning potential range for the adsorption and desorption of hydrogen can be controlled; drawn through the experimental conditions investigated Pd NPs / ITO electrode optimum reaction temperature of 65 ° C, nitrogen into the electrolyte of dissolved oxygen can be excluded interference, the electrodes can be maintained within a good activity. Chapter III: using a simple cyclic voltammetry SYSTEM prepared by a high electrical activity of Pd NPs / ITO electrode, and the electrode was studied sodium hydroxide solution at room temperature, the electro-oxidation reaction of methanol and ethanol, the respective electrochemical reaction The process discussed in detail. Subsequently investigated the impact of the reactant concentration, scan rate on the electrocatalytic oxidation of methanol and ethanol PdNPs / ITO electrode reaction. Contrast, methanol and ethanol electro-catalytic activity of Pd NPs / ITO electrode than the pure metal palladium electrode (methanol is about pure metal palladium electrode 2 times, ethanol is about four times the pure metal palladium electrode). Methanol and ethanol, the intensity of the oxidation peak current are proportional to the respective concentrations and the scan rate of prescribing and maintain a good linear relationship, the two alcohols Pd NPs / ITO electrode reaction is a diffusion controlled process. Chapter 4: First, the use of cyclic voltammetry scan prepared Pd NPs / ITO electrode propanol and isopropanol at room temperature in alkaline electrolyte electro-catalytic oxidation reaction, and the concentration of reactants, the scan rate of propanol and iso propanol electro-catalytic oxidation reaction on the electrode visit, I found i pa , n-propanol and isopropanol oxidation peak current intensity are prescribing v concentration c and scan rate < sup> 1/2 proportional described two alcohols Pd NPs / ITO electrode reaction is a diffusion controlled process. And comprehensive comparison of methanol, ethanol, n-propanol and isopropanol, drawn electrocatalytic oxidation of low-carbon alcohol in PdNPs / ITO electrode in alkaline medium comply with the following rules: (1) the electro-oxidation of the alcohol molecules with similar cyclic voltammetry. Alcohol oxidation peak current intensity is much larger than the hydrogen desorption and adsorption peak, indicating that these alcohols in the potential range of -1.4 ~ 0.6V or dissociation product will be adsorbed in Pd NPs / ITO electrode surface and inhibit the hydrogen adsorption and desorption, so that the oxidation of the alcohol is dominant; the peak position of the desorption and adsorption of the hydrogen is relatively stable, appeared at about-0.4V and-0.5V; curve almost completely overlap within the range of -0.4 ~ 0.3V potential in the cathode during the scan. (2) the size of the peak current intensity according to the oxidation of alcohols to infer Pd NPs / ITO electrodes on the catalytic activity sequence of four kinds of alcohols are: ethanol> n-propanol> methanol> isopropanol. (3) may largely determine the type of the alcohol in accordance with the differences of the alcohol oxidation peak position. Chapter 5: Using chemical deposition prepared Pd NPs / ITO electrode by electrochemical method in acidic and alkaline electrolyte preliminary study the palladium nano methane gas at room temperature electrocatalytic response. Found in acidic and alkaline electrolyte cyclic voltammetry characteristics are similar, but the peak potential. To saturation through methane oxidation peak current intensity decreased, and the bifurcation phenomenon oxidation peak position is offset. May be due to dissolved into the electrolyte in the methane partial adsorption the in PdNPs / ITO electrode surface, hindering the electrochemical reaction of the Pd by the palladium nano-electro-oxidation of the catalytic methane. This provides a new idea for the development of new methane nano gas sensor.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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