Methanol permeation through proton exchange membranes of direct methanol fuel cells

(2006) Methanol permeation through proton exchange membranes of direct methanol fuel cells. Masters thesis, King Fahd University of Petroleum and Minerals.

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English Abstract

Methanol permeation through proton exchange membranes is one of the major constraints inhibiting large scale commercialization of direct methanol fuel cell (DMFC). In the development of membranes for DMFC, it is important to have accurate, reliable, and convenient techniques for determining the methanol permeation rate through the membranes. Five techniques used for measuring methanol permeation through the proton exchange membranes of direct methanol fuel cells have been screened. Electrochemical techniques were found to be more accurate and reliable. Among the electrochemical techniques, potentiometric techniques has additional advantages of easier reproducibility of results, convenience, and gives more data points. Thus, potentiometric technique was used to determine methanol crossover flux and permeability of prepared SPEEK/TPA/MCM-41 and SPEEK/TPA/Y-zeolite composite membranes. SPEEK/TPA/MCM-41 composite membranes with inorganic loadings (TPA/MCM-41) of 10wt% - 30wt% have permeability values of 0.57 x 10⁻⁸ cm² S⁻¹ - 3.51 x 10⁻⁸ S⁻¹. While SPEEK/TPA/Y-zeolite composite membranes with inorganic loadings (TPA/Y-zeolite) of 10wt% - 30wt% have permeability values of 1.71 x 10⁻⁸ cm² S⁻¹ - 4.29 x 10⁻⁸ cm² S⁻¹. But when 40wt% of TPA/Y-zeolite loading was used higher permeability value of 7.04 x 10⁻⁸ cm² S⁻¹ was obtained. Better reduction in methanol permeation was observed with lower loadings. These composite membranes have good potential for use in the direct methanol fuel cell (DMFC) due to their low methanol permeability.

Item Type: Thesis (Masters)
Subjects: Chemical Engineering
Divisions: College Of Engineering Sciences > Chemical Engineering Dept
Committee Advisor: Rahman, S. U.
Committee Members: Zaidi, S. M. Javaid and Jaber, A. M. Y. and Ahmed, Shakeel and Al-Shalabi, M. A.
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 17:08
Last Modified: 01 Nov 2019 17:02
URI: http://eprints.kfupm.edu.sa/id/eprint/10572