Crystal-phase engineering offers opportunities for the rational design and synthesis of noble metal nanomaterials with unusual crystal phases that normally do not exist in bulk materials. However, it remains a challenge to use these materials as seeds to construct heterometallic nanostructures with desired crystal phases and morphologies for promising applications such as catalysis. Here, we report a strategy for the synthesis of binary and ternary hybrid noble metal nanostructures. Our synthesized crystal-phase heterostructured 4H/fcc Au nanowires enable the epitaxial growth of Ru nanorods on the 4H phase and fcc-twin boundary in Au nanowires, resulting in hybrid Au–Ru nanowires. Moreover, the method can be extended to the epitaxial growth of Rh, Ru–Rh and Ru–Pt nanorods on the 4H/fcc Au nanowires to form unique hybrid nanowires. Importantly, the Au–Ru hybrid nanowires with tunable compositions exhibit excellent electrocatalytic performance towards the hydrogen evolution reaction in alkaline media.

晶相工程为合理设计和合成具有异常晶相的贵金属纳米材料提供了机会，这些晶相通常不存在于散装材料中。然而，使用这些材料作为种子来构造具有期望的晶相和形态的异金属纳米结构仍然是挑战，以用于有前景的应用，例如催化。在这里，我们报告了一种合成二元和三元混合贵金属纳米结构的策略。我们合成的晶体相异质结构的4H / fcc Au纳米线使Ru纳米棒能够在Au纳米线的4H相和fcc-twin边界上外延生长，从而形成Au-Ru混合纳米线。此外，该方法可以扩展到4H / fcc Au纳米线上的Rh，Ru–Rh和Ru–Pt纳米棒的外延生长，从而形成独特的杂化纳米线。重要的，