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 mu M(-1)cm(-2), wide detection range of 2 to 954 mu M, and low detection limit of 0.890 mu M. 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. (C) 2019 Elsevier B.V. All rights reserved.