Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, China.
Nat Chem. 2018 Apr;10(4):456-461. doi: 10.1038/s41557-018-0012-0. Epub 2018 Mar 12.
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.
晶体相工程为合理设计和合成具有不常见晶体相的贵金属纳米材料提供了机会，这些晶体相通常不存在于体材料中。然而，将这些材料用作种子来构建具有所需晶体相和形态的异质金属纳米结构仍然是一个挑战，因为这些结构在催化等有前景的应用中具有潜在价值。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。我们合成的晶相异质结构 4H/fcc Au 纳米线能够在 Au 纳米线的 4H 相和 fcc-孪晶界上外延生长 Ru 纳米棒，从而形成混合 Au-Ru 纳米线。此外，该方法可以扩展到 Rh、Ru-Rh 和 Ru-Pt 纳米棒在 4H/fcc Au 纳米线的外延生长，从而形成独特的混合纳米线。重要的是，具有可调组成的 Au-Ru 混合纳米线在碱性介质中对析氢反应表现出优异的电催化性能。
