Abstract
A stencil method, that utilizes a dried powder made of the catalyst and the Nafion ionomer phase, is used to make catalyst layers and membrane electrode assemblies (MEAs). The influence of different hot-pressing conditions on the DMFC performance and various properties of the MEAs, in particularly on the properties of the anode, are investigated and compared to MEAs made by the conventional spray method. The highest DMFC performance is achieved using MEAs made by stenciling. It is also found that the membrane resistance (Rm), the resistance to proton transport within the catalyst layer (Rp) and the charge transfer resistance (Rct) towards the CH3OH oxidation reaction are lower for stenciled vs. sprayed anodes.
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