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Preparation of Pt/CMK-3 Anode Catalyst and Its Application in Direct Methanol Fuel Cell

Author: LiHeng
Tutor: KongLingBin
School: Lanzhou University of Technology
Course: Materials Physics and Chemistry
Keywords: Pt/CMK-3 Mesoporous Carbon Morphology The direct methanol fuel cell
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 81
Quote: 0
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Abstract


The direct methanol fuel cell (DMFC) has a high energy density, do not pollute the environment, convenient source of liquid fuel requirements and low as well as the external environment is expected to become a new generation of energy. Carbon noble metal catalyst, however, is commonly used in the practical application of the direct methanol fuel cell DMFC there so many shortcomings can not be a wide range of commercial applications, especially in the catalytic activity is not high, anti-poor shortcomings solved poisoning ability, and these problems with the type of catalyst, the dispersibility and the particle size is related to the carrier of choice of the catalyst is also closely related to the catalyst electrochemical performance. Ordered mesoporous carbon has an excellent chemical stability, thermal stability, mechanical properties and high electrical conductivity, while the ordered mesoporous carbon has regular pore structure, very large specific surface area, as well as suitable for macromolecules and protons into the reaction and the mesoporous product discharge piping, ordered mesoporous carbon as catalyst support applications has been increasing attention. In this paper, prepared with different morphologies Ordered Mesoporous Carbon CMK-3 based on the use of formaldehyde as a reducing agent prepared by impregnation with different morphologies CMK-3 the carrier Pt/CMK-3 catalyst, different shaped appearance and particle size of the CMK-3 as the catalyst carrier catalyst for methanol oxidation catalytic performance. Experimental X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption desorption (BET) Characterization of means were used to characterize the CMK-3 was prepared to study its morphology, particle particle diameter, and the pore structure and specific surface area. Simultaneously by XRD, TEM analysis of the different morphology CMK-3 as the carrier prepared catalyst platinum particle size and dispersion of, and through the three-electrode system the electrochemical workstation catalysts were cyclic voltammetry, chronoamperometry test different CMK-3 for the electrochemical properties of the catalyst carrier. Experiments show that has a large specific surface area, large aspect ratio, particle size larger CMK-3 more conducive as a catalyst carrier, mainly because of the CMK-3 greater than the surface area is small reunion more conducive to the surface of the precious metal with the electrolytic solution in contact with, and promote the reaction occurs is also conducive to the discharge of the product. In addition, we also make some improvements Electrochemical Preparation Pt/CMK-3 method and were characterized by BET, TEM. By electrochemical means, the catalytic properties of the test, and using the traditional electrochemical prepared Pt/CMK-3 catalyst and XC-72 as the carrier of the catalyst with a comparison. We found that the improved electrochemical deposition of the Pt particle diameter to be smaller than the Pt particle size were prepared by the conventional method, while Pt dispersion of the particles should be better, and also relatively excellent in its catalytic performance.

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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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