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Preparation of Membrane Electrode Assembly for Micro-Tubular Proton Exchange Membrane Fuel Cell

Author: WenWei
Tutor: WangBiao
School: Donghua University
Course: Nano- fiber and hybrid materials
Keywords: Micro- tubular fuel cell A membrane electrode (MEA) Hollow carbon fiber tube Electrochemical properties
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 68
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Abstract


The proton exchange membrane fuel cell (PEMFC) is a direct will be stored in the fuel and oxidant in the chemical energy efficient, pollution-free manner, into electrical power generation device. The PEMFC advantage of low temperature startup performance, non-corrosive, cell stack is designed to be simple, rugged system, is recognized as the best hope to become the preferred source of aerospace, military, electric vehicle, and regional power stations and portable devices. Proton exchange membrane fuel cells mainly flat structure, there is a low volume quality power, the problem of high cost, due to the large size, it is difficult to use in small portable devices. To solve the above problem, the paper designs prepared a porous hollow carbon fiber tube support tube base body of the micro tubular proton exchange membrane fuel cell membrane electrode, the study of different methods of dealing with carbon fiber tube's approach to increase the reaction surface area; prepared a Pt catalyst and Ru catalyst is used as the anode catalyst of the membrane electrode, deposited by impregnation method set out in the cathode supporting the E-TEKVulcan XC-72 Pt / C electro-catalyst, and its particle structure of the catalyst, catalytic performance and the loading amount Test studies; prepared through the proton exchange membrane is coated with micro tubular proton exchange membrane fuel cell membrane electrode, and the cell performance was tested. Through the above research work, we get the following conclusions: (1) polyacrylonitrile (PAN) hollow protofilament pretreatment using 50% DMSO etching method of the PAN precursor effective to increase the surface pores to obtain a more a large specific surface area. Using an acid after the treatment method can effectively remove the carbon fiber prepared after pre-oxidation and carbonization of the hollow tube (PAN-CF) wall on the presence of salts and impurities such as carbon tubes debris. (2) showed that formaldehyde prepared Pt catalyst in the surface and inside of the carbon fiber tube uniformly dispersed, the loading amount of Pt was 0.4mg/cm 2 , below the generally plate of the PEMFC electrically catalyst Tam load, catalyst particles foot diameter of 4.4nm, effective electrochemical area of ??41.32m , 2 the g Pt -1 , the utilization of Pt high electrocatalytic performance. (3) by using impregnation method of the Nafion solution was coated on the surface of the carbon fiber tube, and forming a continuous film of proton exchange, and by the test results prove that the FTIR and commodity Nafion membrane structure, in the scanning electron microscope observation of thickness approximately 0.5μm. (4) By using hydrogen as fuel, and methanol as the fuel under the atmospheric environment at room temperature the electrochemical performance of the micro tubular PEMFC single cell test, studies indicate that the maximum power density of using hydrogen as the fuel cell performance 0.23 mW / cm 2 , the maximum current is about 2.1mA/cm 2 , the open circuit voltage of 0.6V, single cell electrochemical performance is relatively poor; The use 3mol / L of methanol as a fuel test battery electrochemical performance, maximum power density 1.75mW/cm 2 , the maximum current density of 14mA/cm 2 , the open circuit voltage of 0.82V, compared to using hydrogen as fuel shows good electrochemical performance of the battery cell.

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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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