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Herein, the Co 3 O 4 /NiCo 2 O 4 nanocomposite has been prepared as a novel electrochemical sensor to accurately detect hydrogen peroxide (H 2 O 2 ) and glucose. ZIF-67 is a metal-organic framework (MOF) with Co as the center metal ion. Co 3 O 4 can be obtained by calcination of ZIF-67 at 700 °C, which can retain the structure of ZIF-67. The hollow Co 3 O 4 nanocrystal was synthesized based on a calcination process of ZIF-67. This open structure can promote the whole Co 3 O 4 /NiCo 2 O 4 nanocomposite larger accessible surface area and reactive sites. Co 3 O 4 has good electrocatalytic performance, which has been applied in many fields. Moreover, H 2 O 2 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.

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