The rapid and effective mixing of reactants and catalysts is essential in liquid-phase catalytic reaction to boost mass transport. However, the routinely used magnetic stirring method is impractical for ultra-small systems such as lab-on-chip and flow cell due to the macroscale size of the magnetic bars. Herein, we developed a facile strategy to synthesize catalytically active magnetic Co@C nanorods, which could serve as both high-performance catalysts and magnetic stirring nanobars for micro-catalytic reactions. The Co@C core-shell structure endows the materials with high catalytic activity and excellent durability, while the strong magnetism of Co nanoparticles renders the nanorod catalyst unique stirring capability under an external rotating magnetic field, which significantly promotes the mass transport and also the catalytic efficiency in micro-catalytic reactions. Inspired by the unique structure and properties, the mixing ability and catalytic activity of Co@C nanorods were evaluated in several systems.

反应物和催化剂的快速有效混合对于促进传质的液相催化反应至关重要。然而，由于磁棒的宏观尺寸，常规使用的磁力搅拌方法对于超小型系统（如芯片实验室和流动池）是不切实际的。在此，我们开发了一种简便的策略来合成具有催化活性的磁性 Co@C 纳米棒，该纳米棒既可以用作高性能催化剂，也可以用作微催化反应的磁力搅拌纳米棒。Co@C核壳结构赋予材料高催化活性和优异的耐久性，而Co纳米颗粒的强磁性使纳米棒催化剂在外部旋转磁场下具有独特的搅拌能力，这显着促进了微催化反应中的传质和催化效率。受其独特结构和性质的启发，在多个系统中评估了 Co@C 纳米棒的混合能力和催化活性。