Precise control of the morphology, composition and structure of metal nanostructures not only effectively improves their catalytic activity and durability but also enhances their range of applications. In this work, bimetallic Au@Rh core–shell nanodendrites are synthesized by a facile one-pot hydrothermal method. Physical characterizations show that the dendritic Rh consists of two-dimensional (2D) ultrathin Rh nanoplates with a thickness of approximately 1.2 nm. For the first time, Au@Rh core–shell nanostructures are used as a catalyst for the hydrogen generation reaction from aqueous hydrazine solution (N₂H₄=N₂+2H₂, HGR-N₂H₄). Bimetallic Au@Rh core–shell nanodendrites exhibit improved catalytic activity and durability for the HGR-N₂H₄ compared with commercial Rh nanocrystals, which can be attributed to the atomically ultrathin structure of 2D Rh nanoplates and the interconnected structure of nanodendrites, respectively. Under light irradiation, bimetallic Au@Rh core–shell nanodendrites show light-enhanced catalytic activity for the HGR-N₂H₄, originating from the distinctive localized surface plasmon resonance of Au icosahedron cores.

精确控制金属纳米结构的形态，组成和结构，不仅可以有效地提高其催化活性和耐久性，而且可以扩大其应用范围。在这项工作中，双金属Au @ Rh核壳纳米枝晶通过一种简便的一锅水热法合成。物理特征表明，树枝状Rh由二维（2D）超薄Rh纳米板组成，厚度约为1.2 nm。首次使用Au @ Rh核-壳纳米结构作为催化剂从肼水溶液（N ₂ H ₄ = N ₂ + 2H ₂，HGR-N ₂ H ₄）。与商业Rh纳米晶体相比，双金属Au @ Rh核壳纳米树枝晶对HGR-N ₂ H _4的催化活性和耐久性均有改善，这可以分别归因于二维Rh纳米板的原子超薄结构和纳米树枝晶的互连结构。在光照射下，双金属Au @ Rh核壳纳米树枝晶对HGR-N ₂ H ₄表现出增强的光催化活性，这是由于Au二十面体核的独特局部表面等离子体共振引起的。