Abstract
In this investigation, hydrophobic dodecylamine-modified carbon supports are prepared for proton exchange membrane fuel cells by organic synthesis. Well-dispersed Pt–Ru nanoparticles, with a narrow size distribution, are then deposited on the dodecylamine-modified carbon supports by methanol reduction to serve as cathodic catalysts. These dodecylamine-modified catalysts are separately mixed with either a commercial catalyst or unmodified catalyst to provide hydrophobic channels to convey the reaction gas to the active sites in the catalyst layer. The best cathode composite catalyst, containing 20–40 wt% of modified-catalyst, gives approximate 30% increase in the maximum power density, comparing to E-TEK catalyst (125 mW cm −2). The increase in the maximum power density is attributed to higher activity and lower resistance. This result is discussed in the context of AC-impedance and proton conductivity analysis.
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