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The performance and mechanism of multi-step activation of MEA for DMFC
- Source :
- International Journal of Hydrogen Energy. 35:12341-12345
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- Membrane electrode assembly (MEA) after hot-pressing could not achieve its best performance before activated properly because the passages for protons, electrons, reactants and products in the MEA are not constituted completely. In this research, effective multi-step activation for MEA was proposed and the mechanism was discussed. The process includes three steps: methanol activation at room temperature, forced activation at intermediate temperature and proton activation at intermediate temperature. The performance of the MEA was correspondingly improved and reached respectively 54 mW cm−2, 61 mW cm−2, 78 mW cm−2, after each step of the activation. Apparently the performance was greatly enhanced by multi-step activation. The activation process of MEA is not only a process of the humidification of the proton exchange membrane but also a complex process for the establishment of the channels for electrons, ions, gases and liquids. Furthermore the conduction of electrons, ions and the transportation of the reactants and products are enhanced while the micro-structure of the MEA is kept stable.
- Subjects :
- Proton
Renewable Energy, Sustainability and the Environment
Chemistry
Membrane electrode assembly
Energy Engineering and Power Technology
Proton exchange membrane fuel cell
Electron
Condensed Matter Physics
Thermal conduction
Ion
chemistry.chemical_compound
Fuel Technology
Chemical engineering
Intermediate temperature
Methanol
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 35
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi...........e56d14777d44e513010cb589cf69ba5a
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2010.08.108