Combining core-shell construction with an alloying effect is effective for optimizing the electronic and lattice strain effects for achieving highly catalytic efficiency for a given electrochemical reaction. Here, we report the use of core-shell Au@FePd nanoparticles with an Au core and a sub-nano FePd alloy shell to demonstrate this concept. The Au core modifies the electronic configuration of Pd atoms, while the Fe component in thin shells reduces the lattice expansion of Pd induced by the Au core, both of which endow the Pd shell with an appropriate d-band center, favorable for the electrooxidation of ethanol through the C₁ pathway. In particular, the as-prepared core-shell Au@FePd nanoparticles at an optimized Fe:Pd ratio exhibit a mass activity of 13.3 A mg⁻¹ and a specific activity of 20.2 mA cm⁻² for the ethanol electrooxidation in an alkaline medium, which outperform those of a majority of the recently reported Pd-based electrocatalysts.

将核-壳结构与合金化效果相结合可有效优化电子和晶格应变效应，从而在给定的电化学反应中实现高催化效率。在这里，我们报告了具有Au核和亚纳米FePd合金壳的核壳Au @ FePd纳米颗粒的使用，以证明这一概念。Au核修饰了Pd原子的电子构型，而薄壳中的Fe成分降低了Au核诱导的Pd的晶格膨胀，两者都使Pd壳具有适当的d带中心，有利于Pd原子的电氧化。乙醇通过C ₁途径。特别地，以优化的Fe：Pd比例制备的核壳Au @ FePd纳米颗粒的质量活性为13.3 A mg ^-1在碱性介质中对乙醇电氧化的比活为20.2 mA cm ^-2，优于最近报道的大多数Pd基电催化剂。