Three-Dimensional Carbon Foam Supported NiO Nanosheets as Non-enzymatic Electrochemical H2O2 Sensors

Abstract In this work, we successfully in-situ fabricated two-dimensional (2D) nickel oxide nanosheets (NiO-NSs) uniformly grown on a three-dimensional (3D) carbon foam (CF) network by using a facile solvothermal reaction assisted with a subsequent annealing procedure. The nanoporous NiO nanosheet structures can be size-controlled by simply tuning the reaction temperature and time (90 oC for 10 and 20 h, 120 oC for 10h, 180 oC for 1h). Among the studied composites, the obtained NiO-NSs/CF-1801 modified electrode exhibited the highest performance for non-enzymatic detecting H2O2. It showed the lowest limit of detection (LOD=13.41 nM) and the largest linear detection range (0.20–3.75 mM) with a sensitivity of 23.30 μA mM-1 cm-2. This excellent performance is due to the synergetic effect of 3D micron-level porous structure of carbon foam and the in-situ uniformly growth of NiO nanosheets. The present results demonstrate that NiO-NSs/CF is a promising sensing candidate for quantitative electrochemical detecting H2O2.