A facile one-pot synthesis of Au core flower surrounding with thin Co3O4 shell for highly sensitive detection of hydrogen peroxide

In this study, we described the facile synthesis of Au core flower surrounding with thin Co 3 O 4 shell for enhanced electrochemical sensing of H 2 O 2 . Such core-shell structure was obtained by employing Au 3+ to oxidize Co 2+ under alkaline conditions for triggering the redox assembly process. The experiment results revealed that conductive Au core flower was surrounded by thin Co 3 O 4 shell, and such structure not only accelerates electron transfer rate but also provides more effective active sites for H 2 O 2 reaction, therefore making the sensor based on Au@Co 3 O 4 exhibit an excellent performance for H 2 O 2 analysis with a linear range of 0.2 μM-7.1 mM, a high sensitivity of 722.4 μA mM −1 cm -2 and a low detection limit of 0.06 μM. The excellent experimental results implied that Au@Co 3 O 4 nanocomposite was a promising sensing material for electrochemical detection of H 2 O 2 .