Fabrication of Co₃O₄/NiCo₂O₄ Nanocomposite for Detection of H₂O₂ and Dopamine

Herein, the Co₃O₄/NiCo₂O₄ nanocomposite has been prepared as a novel electrochemical sensor to accurately detect hydrogen peroxide (H₂O₂) and glucose. ZIF-67 is a metal-organic framework (MOF) with Co as the center metal ion. Co₃O₄ can be obtained by calcination of ZIF-67 at 700 °C, which can retain the structure of ZIF-67. The hollow Co₃O₄ nanocrystal was synthesized based on a calcination process of ZIF-67. This open structure can promote the whole Co₃O₄/NiCo₂O₄ nanocomposite larger accessible surface area and reactive sites. Co₃O₄ has good electrocatalytic performance, which has been applied in many fields. Moreover, H₂O₂ and dopamine sensing tests indicate that the as-prepared non-enzymatic electrochemical biosensor has good detection properties. The testing results indicate the as-prepared biosensor has a wide detection range, low detection limit, high selectivity, and long-term stability. These testing results suggest the potential application in food security, biomedicine, environmental detection, and pharmaceutical analysis.