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Preparation of Electro-Catalysts of Proton Exchange Membrane Fuel Cell by Solvothermal Method

Author: XiaXiaoZuo
Tutor: YuanXianXia；MaZiFeng
School: Shanghai Jiaotong University
Course: Chemical Engineering
Keywords: Solvothermal Precious metal catalyst Non- precious metal catalyst High - temperature solvent Low - temperature solvent
CLC: TM911.4
Type: Master's thesis
Year: 2009
Downloads: 120
Quote: 0
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Abstract


The proton exchange membrane fuel cell (PEMFC) is a perfluorosulfonic acid type solid polymer electrolyte, in accordance with electrochemical principles the anode fuel (including hydrogen, methanol, ethanol, etc.) of the chemical can be converted to electrical energy of the energy conversion devices. In addition to the advantage of the general fuel cell (high energy conversion efficiency, environmental friendliness, etc.), it also has at room temperature quick start, long life, high specific power and specific energy advantages. Catalyst PEMFC is a key material, a suitable catalyst must meet the requirements of the activity, stability and cost. The catalyst preparation method have great impact, so find a suitable catalyst preparation method has very important significance. In order to improve the performance and reduce the cost of preparation of the catalyst, using solvothermal method to prepare PEMFC electro-catalyst. Depending on the boiling point of the solvent, can be divided into a high-temperature solvent and a low-temperature solvent. Considering the advantages and disadvantages of the high and low temperature solvothermal method, selecting high temperature Solvothermal noble metal catalysts, with a low temperature solvothermal method for non-precious metal catalyst. The high-temperature microwave-assisted solvothermal Mo modified Pt / C noble metal catalyst, ethanol electro-oxidation performance. High temperature and solvent used at high temperatures with good reduction properties of ethylene glycol (EG), immersion time, pH value, reaction time has been systematically studied to optimize the preparation process. The results show that the method is conducive to a small particle diameter was prepared, and uniform distribution of the noble metal catalyst; does not require heat treatment, reduce the energy consumption of the preparation process. Performance of the catalyst prepared in their particle size, crystal type structure. Mo modified content on the catalyst performance, found the PtMo molar ratio of 2:1, the highest activity for ethanol electro-oxidation. This article has taken ultrasound-assisted low-temperature solvothermal prepared CoTMPP / C non-precious metal catalyst, oxygen reduction performance. Low temperature solvent selected glacial acetic acid, methylene chloride and aqueous ammonia three as a comparative, and at the same time the heat treatment temperature was studied. The process with the microwave method, milling wears comparison, good performance, simple preparation process, is expected to achieve mass production. The article also put forward innovative a composite non-precious metal catalyst, which greatly improved the oxygen reduction 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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