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Research of Nanofiber Reinforced Proton Exchange Membrane
Author: ZhaoZiZuo
Tutor: YuJun
School: Wuhan University of Technology
Course: Materials Processing Engineering
Keywords: Proton exchange membrane fuel cell Proton exchange membrane Nafion SiO2/PVDF composite nanofibers SiO2 nanofibers
CLC: TM911.4
Type: Master's thesis
Year: 2011
Downloads: 64
Quote: 0
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Abstract
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Proton exchange membrane fuel cell' dissertation">Proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell, PEMFC) due to their high energy conversion efficiency, high power density, low temperature start-up and pollution, etc., are widely used in automotive power and energy, portable power equipment and so on. Proton exchange membrane (PEM) is a proton exchange membrane fuel cell is one of the core components, play a proton conduction, separate the fuel and oxidant effect and to prevent short circuits. Increase the operating temperature of the fuel cell can effectively improve the thermal management of water in the fuel cell and the catalyst poisoning. However, the current widespread use of a perfluorosulfonic acid proton exchange membrane (such as Nafion film series) proton conductivity depends on the presence of moisture, working at higher than 100 ℃, the direct result of severe dehydration membrane decrease in proton conductivity. Meanwhile, the Nation glass transition temperature of the film is low, the effective limit of its maximum operating temperature. This article was prepared by electrostatic spinning SiO2/PVDF SiO2 composite nanofiber membranes and nanofibers, and to SiO2/PVDF SiO2 composite nanofiber membranes and nanofibers as a reinforcement impregnated into the perfluorinated sulfonic acid resin to obtain a composite proton exchange film, designed to improve the proton exchange membrane performance while water thermal mechanical properties enhancement film, thereby enhancing the proton conductivity at high temperatures, improved high temperature performance of the battery. In this study based on the thermal stability of the composite membrane and thermal mechanical properties of the composite film is investigated at different temperatures the proton conductivity. The following results were obtained: (1) successfully prepared using electrostatic spinning fiber membrane nanocomposite, 30% SiO2/PVDF fiber surface is smooth, single fiber is straight, the diameter of nanofibers about between 500-800nm. The SiO2/PVDF reinforced nanocomposite fiber membrane prepared from fibroblasts as uniformly distributed SiO2/PVDF/Nafion composite proton exchange membrane. By TG, TMA tests show that the composite membranes SiO2/PVDF/Nafion improved glass transition temperature, thermal stability significantly higher than the Nafion membrane, water-swelling tests show that the dimensional stability of the composite membrane has been improved, AC impedance tests show SiO2/PVDF / Nafion composite membrane conductivity of SiO2 as the fiber content increases higher, up to 0.23S/cm-1. (2) using the recast prepared SiO2/Nafion short fiber reinforced composite proton exchange membrane, SiO2 nano-fibers have a diameter of 300-600nm. TG, TMA tests show SiO2 nano fiber can effectively improve the strength of the composite film composite membrane SiO2/Nafion thermal and thermomechanical properties, through the water swelling tests show SiO2/Nafion composite membrane proton exchange membrane improved dimensional stability, exchange SiO2/Nafion composite membrane impedance tests showed improved proton conductivity, SiO2/Nafion the proton conductivity of the composite up to 0.26 S/cm-1.
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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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