Direct methanol fuel cells

Sultan, Jassim (2003) Direct methanol fuel cells. Masters thesis, Memorial University of Newfoundland.

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    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
    (Original Version)

Abstract

This investigation of the characteristics of direct methanol fuel cells (DMFC) has led to significant improvement in their performance. The methanol permeability of Nafion polymer electrolyte membranes has been measured in a DMFC by chronoamperometry. The activation energy for methanol diffusion was determined to be 25 kJ mol⁻¹. -- Methanol crossover reduces the performance of the DMFC Several polypyrrole/Nafion composite membranes were prepared and have been shown to be significantly less permeable to methanol. DMFC performances achieved with some of these polypyrrole/Nafion composite membranes have outperformed those for unmodified Nafion membranes. However, their performances have been shown to be strongly affected by the modification method. Membranes modified by Fe³⁺ oxidation of pyrrole have shown poor bonding with the electrodes, whereas use of H₂O₂ generally yields better results. The performance gains with the composite membranes are due to better cathode activity as a result of methanol crossover reduction.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/7016
Item ID: 7016
Additional Information: Includes bibliographical references.
Department(s): Science, Faculty of > Chemistry
Date: 2003
Date Type: Submission
Library of Congress Subject Heading: Fuel cells; Methanol as fuel

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