查看文章

Preciously tuning the surface composition of noble metal nanoparticles with the particle size of only 2 nm or less by alloying with other metals represents a powerful strategy to boost their electrocatalytic selectivity. However, the synthesis of ultrafine nanoalloys and tuning their surface composition remain challenging. In this report, ultrafine CuPd nanoalloys with the particle size of ca. 2 nm are synthesized based on the galvanic replacement reaction between presynthesized Cu nanoparticles and Pd²⁺ precursors, and the tuning of their surface compositions is also achieved by changing the atom ratios of Cu/Pd. For the electrocatalytic reduction of CO₂, Cu₅Pd₅ nanoalloys show the CO Faradaic efficiency (FE) of 88% at −0.87 V, and the corresponding mass activity reaches 56 A/g that is much higher than those of Cu₈Pd₂ nanoalloys, Cu₃Pd₇ nanoalloys and most of previously reported catalysts. Density …