Three-Dimensional Carbon Foam Supported Co3O4/NiO Nanosheets As Non-Enzymatic Electrochemical H2O2 Sensors

Abstract

In the present work, we successfully in-situ synthesized a three-dimensional (3D) carbon foam (CF) supported two-dimensional (2D) cobaltosic oxide/nickel oxide nanosheets through a facile solvothermal reaction assisted with a subsequent annealing procedure. Scanning electron microscopy (SEM) measurements showed that Co3O4/NiO nanosheets were uniformly grown on the 3D carbon framework at 180 °C for 1h which was labled as Co3O4/NiO-NSs/CF-1801. Due to the micron-level porous architecture and the high conductivity of the 3D carbon foam, the obtained composites possess large surface area, fast mass transport and high electronic conductivity. The Co3O4/NiO-NSs/CF-1801 showed a relative low limit of detection (LOD=5.51 µM) and the wide linear detection range (0.20–4.00 mM) with a sensitivity of 7.67 mA mM-1 cm-2. This excellent performance is due to the synergetic effect of micron-level porous architecture of 3D carbon foam and the in-situ uniformly growth of Co3O4/NiO nanosheets, which make them to be promising materials as electrochemical H2O2 sensing catalysts.