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Membrane electrode assemblies (MEAs) were fabricated using a high frequency spraying technique. Electrocatalyst powders were directly sprayed onto an electrolyte membrane by ultrasonic spraying. The weight ratios of Nafion to Pt/C were studied, and the ratio about 50–62% yields the maximum current density at the ohmic and gas diffusion region of the polarization curve. Cross sections of the MEA were...
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