Pervaporation membranes in direct methanol fuel cells |
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| Institution: | 1. Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague 6, Czech Republic;2. Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, v.v.i., Rozvojová 135, 16502 Prague 6, Czech Republic;1. Department of Chemical Engineering, National Tsing Hua University, ♯101, Section 2, Kuang-Fu Road, Hsinchu 30013, Taiwan;2. Chemistry Division, National Chung-San Institute of Science and Technology, Lungtan, Taoyuan 32517, Taiwan;3. R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, Chungli, Taoyuan 32023, Taiwan;1. The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phyathai Road, Pathumwan, Bangkok 10330, Thailand;2. Center for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand;1. State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, PR China;2. College of Textile, Tianjin Polytechnic University, Tianjin 300387, PR China |
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| Abstract: | The membranes in direct methanol fuel cells must both conduct protons and serve as a barrier for methanol. Nafion, the most common fuel cell membrane, is an excellent conductor but a poor barrier. Polyvinyl alcohol pervaporation membranes are good methanol barriers but poor conductors. These and most other pervaporation membranes offer no significant advantages over Nafion in methanol fuel cell applications. However, polybenzimidazole membranes have demonstrated characteristics that suggest up to a 15-fold improvement in direct methanol fuel cells. This improvement may be due to an alternate form of proton conduction in which protons travel via a Grotthus or “hopping” mechanism. |
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