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Study on Preparation and Performance of Membrane Electrode Assembly for Proton Exchange Membrane Fuel Cells

Author: ZhangZhiYuan
Tutor: TianJianHua
School: Tianjin University
Course: Applied Chemistry
Keywords: PEMFC MEA CCM Nafion/ TiO2 hybrid membranes Sol-gel
CLC: TM911.4
Type: Master's thesis
Year: 2009
Downloads: 66
Quote: 0
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Abstract


Proton exchange membrane fuel cell (PEMFC) has significant advantages such as high power density, low operating temperature and excellent stability. PEMFC has a bright future in areas such as astronavigation, submarine and electric vehicles. In order to bring the commercialization of PEMFC into reality, researchers all over the world are endeavoring to develop relative materials to decrease the cost and improve the performance of PEMFC.In this paper we have two aspects: (1) the study on the CCM (catalyst coated membrane); (2) a sol-gel process for the preparation of Nafion/TiO2 composite membrane.Through the study on CCM, this paper presents the optimum NL (Nafion loading) of catalyst layer; we prepare MEAs that have two different compositions of catalyst layers in cathode. The result indicate the dual catalyst layer coated MEA showed higher cell performance than the typical MEA; a Nafion layer is inserted between PEM and CL, and the result indicate that the performance of the five-layer CCM is better than the typical one.This paper presents a study about the influence to the catalyst layer of organic solvent, content of isopropanol, and the temperature. And the Pt loading, Pt loading on carbon of cathode is important to the cathode.This paper presents a sol-gel process for the preparation of Nafion/TiO2 composite membrane. The optimum preparing condition is heat in water and dried in vacuum. The experiment results of XRD, ESEM demonstrated that the crystal structure of TiO2 was anatase and the content of Ti enhanced with the increase of thickness of composite membrane.The performance of Nafion/TiO2 composite membrane mainly related to the content of TiO2. The influence of the concentration of Ti (OBu)4 on performance of composite membranes was investigated, and the optimum range of concentration was confirmed in this article. The self-humidifying capability of composite membrane and the influence of temperature to it was shown in this paper. Through these, the water management ability of TiO2 is ascertained.

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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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