Three-dimensional carbon foam supported NiO nanosheets as non-enzymatic electrochemical H2O2 sensors

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 °C for 10 and 20 h, 120 °C for 10 h, 180 °C for 1 h). 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 = 13.03 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.