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Studies on Direct Methanol Fuel Cell Anodic Catalysts

Author: LiuYiCheng
Tutor: WuGuoShi；QiuXinPing
School: Tsinghua University
Course: Physical and chemical
Keywords: The direct methanol fuel cell Pt-Ru catalyst Reverse micelles The mesophase carbon microspheres carrier Electro-oxidation of methanol
CLC: TM911.4
Type: PhD thesis
Year: 2002
Downloads: 859
Quote: 5
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Abstract


The direct methanol fuel cell (DMFC) fuel easy to transport and storage , light weight , small size , simple structure , energy efficiency , and has broad prospects for development in the field of portable power , and electric vehicles . However slow the rate of oxidation of methanol on the anode and methanol permeability is used in high-power , high - capacity battery , two major technical challenges . Preparation of the paper focuses on efficient anode catalysts for methanol oxidation rate problem , its carrier and affect the catalytic properties of a variety of factors . The major achievements in the anode catalyst developed as follows: ( 1) for the first time using reverse micelles prepared Pt / C catalyst , successfully controlled the Pt particle size by adjusting the proportion of water and surfactant ; ( 2) the first time the reverse micelles Preparation of Pt-Ru / C catalyst in the oxidation current of 150 mA / mg (Pt) , the electrode potential measured obtaining was 0.55 V , 70 mV lower than the electric potential of the electrode Pt-Ru/Vulcan XC-72 . Showed that with the catalyst prepared by the new method can significantly improve the catalytic activity . Carrier Development Mechanism main results : ( 1) for the first time with micron mesophase carbon microbeads (MCMB) pretreatment on the catalyst activity as a catalyst carrier . The results show that the Pt / MCMB pretreated by KOH solution intermediate phase when used as a carrier with the carbon microspheres prepared catalyst exhibits high catalytic activity . In the oxidation current of 60 mA , measured obtaining electrode electric potential is 0.47 V , than the low Pt / Vulcan XC-72 electrode potential of 20 mV ; ( 2 ) prepared Pt-Ru/MCMB catalyst and the half-cell test , at 300 mA cm-2/90oC , measured electrode potential of 0.41V, 0.17 V is lower than the electrode potential of the Pt-Ru/Vulcan XC-72 ; ( 3 ) investigated the pressing pressure of the battery temperature, Nafion content in the catalyst layer and the MEA battery performance and stability of Cl - and F- concentration methanol electro-oxidation of methanol electro-oxidation intermediate UPD area and about the mechanism put forward a reasonable explanation. More than the result of the direct methanol fuel cell research has important guiding significance . The proposed reverse micelle method of catalyst preparation process as well as MCMB new carrier direct the development and application of the value and provide improved catalysts for methanol electro-oxidation and the development of new programs .

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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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