Fabrication of core-shell nanostructured catalyst is a promising way for tuning its catalytic performance due to the highly active interface and rich redox properties. In this work, hierarchical Co₃O₄@NiO core-shell nanotubes are fabricated by the deposition of NiO shells via a chemical bath treatment using electrospun Co-C composite nanofibers as templates, followed by a calcination process in air. The as-prepared Co₃O₄@NiO core-shell nanotubes exhibit a uniform and novel hollow structure with Co₃O₄ nanoparticles attached to the inner wall of NiO nanotubes and excellent catalytic activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H₂O₂. Due to the synergistic effect, the peroxidase-like activity of the Co₃O₄@NiO core-shell nanotubes is much higher than that of individual Co₃O₄ and NiO components. Owing to the superior peroxidase-like activity, a simple and rapid colorimetric approach for the detection of dopamine with a detection limit of 1.21 µM and excellent selectivity has been developed. It is anticipated that the prepared Co₃O₄@NiO core-shell nanotubes are promising materials applied for biomedical analysis and environmental monitoring.

由于具有高活性的界面和丰富的氧化还原特性，核-壳纳米结构催化剂的制备是调节其催化性能的一种有前途的方法。在这项工作中，分层的Co ₃ O ₄ @NiO核-壳纳米管是通过使用电纺Co-C复合纳米纤维作为模板，通过化学浴处理沉积NiO壳，然后在空气中进行煅烧过程而制成的。所制备的Co ₃ O ₄ @NiO核壳纳米管表现出均匀且新颖的中空结构，其中Co ₃ O ₄纳米颗粒附着在NiO纳米管的内壁上，并且对3,3'，5的氧化具有出色的催化活性， H存在下的5'-四甲基联苯胺（TMB）₂ O ₂。由于协同作用，Co ₃ O ₄ @NiO核壳纳米管的过氧化物酶样活性远高于单个Co ₃ O ₄和NiO组分的过氧化物酶活性。由于具有优异的过氧化物酶样活性，因此开发了一种简单快速的比色法，可检测出多巴胺，其检测限为1.21 µM，且具有出色的选择性。预期制备的Co ₃ O ₄ @NiO核壳纳米管是有前途的材料，可用于生物医学分析和环境监测。