All electrochemical tests were performed with a three-electrode system. The catalyst ink was prepared by dispersing a specific amount of catalyst in 2-propanol by sonication, and the accurate concentration of active components (Pd and Pt) was determined by inductively coupled plasma optical emission spectrometry. For electrocatalysis of ethanol and methanol oxidation, the loading of active components was ~20 μg cm−2, and electrochemical tests were performed in N2-saturated 1.0 M KOH aqueous solution containing 1 M ethanol or methanol.

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