Abstract
The oxidation of formic acid at the surface of two families of composite catalysts, Pd/C–Pc and Pt/C–Pc, where Pc represents a phthalocyanine (–, Mn–, Fe–, Co–, Ni–, or CuPc), was studied in 10 mM HCOOH in 0.1 M electrolyte and in a fuel cell with 10 M HCOOH. For Pd/C–Pc catalysts; the impregnation of Pc onto Pd/C only resulted in lower mass activities compared to Pd/C alone. For Pt/C–Pc catalysts, the impregnation of CoPc, MnPc, or FePc onto Pt/C strongly enhanced the activity of the composite catalyst for formic acid oxidation at low potential ( vs reference hydrogen electrode) compared to Pt/C, whereas , NiPc, and CuPc had no influence. The most beneficial effect of Pc impregnation was obtained with CoPc impregnation onto Pt/C. Fuel cell testing was performed for Pd/C, Pd/C–CoPc, Pt/C, Pt/C–CoPc, and Pt–Ru/C. Similar with the results obtained in the solution, the best performing catalyst in fuel cell was Pd/C followed by Pd/C–CoPc, Pt/C–CoPc, Pt–Ru/C, and finally Pt/C. However, only Pt/C–CoPc and Pt–Ru/C were stable in fuel cell testing.
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