A novel nanohybrid of cobalt oxide-sulfide nanosheets deposited three-dimensional foam as efficient sensor for hydrogen peroxide detection

In this study, we successfully prepared a highly sensitive hydrogen peroxide sensor by directly growing heterostructure of cobalt oxide-sulfide nanosheets on three-dimensional foam. As a self-supporting sensor, it exhibited good activity and excellent stability for hydrogen peroxide detection with a sensitivity of 0.059 mA μM−1 cm−2, wide detection range of 2 to 954 μM, and low detection limit of 0.890 μM. In addition, such sensor also displayed outstanding selectivity and good current response retention of around 87.1% after long-term operation of 1500 s. The achieved results may be due to the synergistic effects generated by the formation of metallic oxide-sulfide heterostructure and unique hierarchical 3D structure, which improved electroactive surface area, electron transfer, and electrolyte/ion diffusion, thereby resulting in the enhancement of catalytic performance. Our research may introduce a promising option for fabricating highly catalytic electrocatalyst towards hydrogen peroxide detection in analytical applications. [Display omitted] •A novel sensor of CoO-CoS sheet-like heterostructures on NF was facilely prepared.•The sensor detects H2O2 with good sensitivity and low LOD of 0.89 μM.•The sensor detects H2O2 with wide linear detection range of 2 to 954 μM.•The sensor exhibited good durability, selectivity as well as excellent stability.