Highly sensitive electrochemical sensing platform: carbon cloth enhanced performance of Co3O4/rGO nanocomposite for detection of H2O2

Co 3 O 4 is often used to detect H 2 O 2 . However, there are many problems such as low sensitivity and the long detection time when detecting H 2 O 2 in various cobalt oxide composites. Therefore, it is a great challenge to develop different morphologies of the Co 3 O 4 electrode to improve the detection performances of H 2 O 2 effectively. In this paper, we had successfully prepared a novel Co 3 O 4 /reduced graphene oxide/carbon cloth (Co 3 O 4 /rGO/CC) composite. We used a simple template method. Co 3 O 4 nanosheets with a diameter of about 47.7 nm were obtained by using graphene oxide as a template. Then, CC was used as a three-dimensional conductive support material. CC can inhibit the agglomeration of rGO to increase specific surface area and to enhance the conductivity of Co 3 O 4 . In this study, the electrochemical performances of the Co 3 O 4 /rGO/CC electrode were tested by the electrochemical workstation. The trigger response of the modified electrode was reduced by 0.067% and the relative standard deviation was 0.013% after 30 consecutive tests. The range of linearity was 0.387–63.523 mM. Besides, this electrode has the limit of detection (0.022 μM) and a higher sensitivity (0.9683 mA mM −1  cm −2 ). It indicated that the electrode has excellent electrochemical sensing performance and high stability. These excellent performances are mainly due to the synergistic effect of Co 3 O 4 nanosheets, rGO, and CC.