Fig. 6.

Formic acid oxidation (FAO) characterization. Cyclic voltammetry (CV) curves (specific activity (a) and mass activity (b)) of the as-synthesized Pd₅₀Cu₅₀, Pd₈₈Co₁₂, Pd₅₆Cu₃₈Co₆, Pd₅₉Cu₃₀Co₁₁, Pd₆₂Cu₁₆Co₂₂, commercial Pt/C, and Pd black with a scan rate of 50 mV s⁻¹ in 0.1 mol L⁻¹ (M) perchloric acid (HClO₄) + 0.5 M formic acid (HCOOH) solution at room temperature. c Histograms of formic acid oxidation (FAO) specific activity and mass activity. Error bars are ±s.d. d Current–time curves of the as-synthesized Pd₅₀Cu₅₀, Pd₈₈Co₁₂, Pd₅₆Cu₃₈Co₆, Pd₅₉Cu₃₀Co₁₁, Pd₆₂Cu₁₆Co₂₂, commercial Pt/C, and Pd black recorded at 0.25 V for 2500 s in 0.1 M HClO₄ + 0.5 M HCOOH solution at room temperature