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High performance membrane electrode assemblies by optimization of coating process and catalyst layer structure in direct methanol fuel cells
- Source :
- International Journal of Hydrogen Energy. 36:5096-5103
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- High performance membrane electrode assemblies (MEAs) for direct methanol fuel cells (DMFCs) are developed by changing the coating process, optimizing the structure of the catalyst layer, adding a pore forming agent to the cathode catalyst layer, and adjusting the hot-pressing conditions, such as pressure and temperature. The effects of these MEA fabrication methods on the DMFC performance are examined using a range of physicochemical and electrochemical analysis tools, such as FE-SEM, electrochemical impedance spectroscopy (EIS), polarization curves, and differential scanning calorimetry (DSC) of the membrane. EIS and polarization curve analysis show that an increase in the thickness and porosity of the cathode catalyst layer plays a key role in improving the cell performance with reduced cathode reaction resistance, whereas the MEA preparation methods have no significant effects on the anode impedance. In addition, the addition of magnesium sulfate as a pore former reduces the cathode reaction transfer resistance by approximately 30 wt%, resulting in improved cell performance.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Membrane electrode assembly
Analytical chemistry
Energy Engineering and Power Technology
engineering.material
Condensed Matter Physics
Electrochemistry
Anode
Dielectric spectroscopy
Direct methanol fuel cell
Fuel Technology
Coating
Chemical engineering
Electrode
engineering
Polarization (electrochemistry)
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi...........0e865368c260affb11fcfd0646658caf