In this work, we utilized a facile air oxidative dealloying approach to synthesize PtCu hierarchical branched nanodendrites (HBNDs). The systematical investigation on the morphology, composition, and structure of PtCu HBNDs by various techniques demonstrates they are three-dimensional open porous nanostructures. The PtCu HBNDs show composition-dependent catalysis in hydrogen evolution reaction (HER). The Pt₁Cu_1.03-D with average size about 40 nm composed of integrated ultrathin branches, presents the highest HER activity with only 20 mV overpotential to achieve 10 mA/cm², 19.34 A/mg_Pt and 9.64 mA/cm² in mass and specific activity at −0.2 V, and excellent durability. The superior HER activity is attributed to the unique porous dendritic structure and electronic synergistic interactions between Pt and Cu as indicated by X-ray photoelectron spectroscopy and density functional theory calculation. This work opens up a new facile route to design large accessible surface and high-performance electrocatalysts with low utilization of Pt for electrochemical energy conversion.

在这项工作中，我们利用了一种简便的空气氧化脱合金方法来合成PtCu分层支链纳米树枝状晶体（HBND）。通过各种技术对PtCu HBNDs的形态，组成和结构进行了系统研究，证明它们是三维开放式多孔纳米结构。PtCu HBNDs在析氢反应（HER）中显示出依赖成分的催化作用。将Pt ₁的Cu _1.03 -D用约只有20毫伏的超电势的集成超薄分支，礼物组成的最高HER活性40nm的平均尺寸，以实现为10mA /厘米²，19.34 A /毫克_的Pt和9.64毫安/厘米²质量和在-0.2 V时的比活，以及出色的耐久性。优异的HER活性归因于X射线光电子能谱和密度泛函理论计算表明，Pt和Cu之间具有独特的多孔树枝状结构以及电子协同作用。这项工作开辟了一条新的简便途径，可设计出易于使用的大型表面和高性能电催化剂，而Pt的利用率不高，可用于电化学能量转换。