Ternary CoPtAu Nanoparticles as a General Catalyst for Highly Efficient Electro-Oxidation of Liquid Fuels.

Efficient electro-oxidation of formic acid, methanol and especially ethanol, is challenging due to the multiple chemical reaction steps required to accomplish full oxidation into CO₂. Herein, we report a ternary CoPtAu nanoparticle catalyst system, in which Co and Pt form an intermetallic L1₀-structure and Au segregates on the surface to alloy with Pt. The L1₀-structure stabilizes Co and significantly enhances the catalysis of the PtAu surface towards electro-oxidation of ethanol, methanol and formic acid, with mass activities of 1.55 A/mgPt, 1.49 A/mgPt and 11.97 A/mgPt respectively in 0.1 M HClO₄. The L1₀-CoPtAu catalyst is also stable with negligible degradation in mass activities and no obvious Co/Pt/Au composition changes after 10,000 potential cycles. The in-situ surface-enhanced infrared absorption spectroscopy study indicates that the ternary catalyst activates the C-C bond more efficiently for the ethanol oxidation. The L1₀-CoPtAu holds great promise as a general fuel cell anode catalyst for renewable energy applications.

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