▎ 摘　　要

In this work, we used graphene oxide (GO) as a template that was removed by calcination to finally successfully prepare Co(3)O(4)with 2D porous nanostructure. The results show that 2D porous structure Co(3)O(4)nanosheets were only prepared at pH = 2. After electrochemical tests, the as-prepared Co(3)O(4)nanosheets showed electrochemical properties that are highly suitable for H(2)O(2)detection, such as high current response, short response time (less than 3 s), wide linear range (0.388-44.156 mM), low limit of detection (2.33 mu M) and high sensitivity (0.0891 mA mM(-1)cm(-2)). These excellent properties are mainly due to GO, as a 2D template, which connects Co(3)O(4)nanoparticles to each other on a 2D plane, preventing the agglomeration of Co(3)O(4)nanoparticles. The abundant pores between Co(3)O(4)nanoparticles can greatly increase the reaction between the nanoparticles and H(2)O(2)molecules.