Developing the nanoalloys with well-designed chemical ordering and understanding the correlation between the chemical ordering and catalytic property remain a challenge, yet represent an effective strategy to improve the performance of the nanoalloys. Herein, three AgPd-based nanoalloys with different composition-segregation types, namely, alloy (mixed-Ag₁₉Pd₇₂Ni₉), core-shell (core-shell-Ag₄₀Pd₆₀) and janus (janus-Ag₂₀Pd₆₀Ni₂₀) atomic arrangements, are developed via a successive co-reduction method and used in the formate oxidation reaction (FOR). The janus-Ag₂₀Pd₆₀Ni₂₀ nanoalloy exhibits an electrocatalytic activity of 1.31 A mg_Pd⁻¹ and remarkable long-term stability, outperforming the commercial Pd/C catalysts. The FOR activity follows the order of janus-Ag₂₀Pd₆₀Ni₂₀ > core-shell-Ag₄₀Pd₆₀ > mixed-Ag₁₉Pd₇₂Ni₉ nanoalloys. After galvanic replacement and acid treatment, the obtained galvanic-Ag₂₀Pd₆₀Ni₂₀ and acid-Ag₂₀Pd₆₀Ni₂₀ nanoalloys demonstrate 2.31 and 1.44 times higher mass activity than the janus-Ag₂₀Pd₆₀Ni₂₀ nanoalloy. The improvements in the activity and stability can be attributed to largely increased Pd active sites on the surface of AgPd-based nanoalloys with optimal chemical ordering.

开发具有良好设计的化学有序性的纳米合金并了解化学有序性和催化性能之间的相关性仍然是一个挑战，但仍代表着一种改善纳米合金性能的有效策略。本文中，三种具有不同组成-分离类型的基于AgPd的纳米合金分别为合金（混合Ag ₁₉ Pd ₇₂ Ni ₉），核-壳（core-shell-Ag ₄₀ Pd ₆₀）和janus（janus-Ag ₂₀ Pd _60） Ni ₂₀原子排列是通过连续的共还原方法开发的，并用于甲酸氧化反应（FOR）中。janus-Ag ₂₀ Pd ₆₀ Ni₂₀纳米合金具有1.31 A mg _Pd ^-1的电催化活性和显着的长期稳定性，优于市售Pd / C催化剂。FOR活性遵循janus-Ag ₂₀ Pd ₆₀ Ni ₂₀ >核-壳-Ag ₄₀ Pd ₆₀ >混合Ag ₁₉ Pd ₇₂ Ni ₉纳米合金的顺序。经过电置换和酸处理后，得到的电-Ag ₂₀ Pd ₆₀ Ni ₂₀和酸-Ag ₂₀ Pd ₆₀ Ni ₂₀纳米合金的质量活性比janus-Ag ₂₀ Pd ₆₀ Ni ₂₀纳米合金高2.31倍和1.44倍。活性和稳定性的改善可归因于具有最佳化学有序性的基于AgPd的纳米合金表面上Pd活性位点的大量增加。