▎ 摘　　要

A green and simple strategy to prepare graphene foam-like three-dimensional (3D) porous carbon/Ni nanoparticles (NiNPs) nanocomposites was developed for glucose detection. The discarded sponge-like natural product, pomelo peel, was employed as novel supporting materials to load a large number of Ni2+ by a simple immersing method to form pomelo peel/Ni2+ which was then carbonized to construct the graphene foam-like 3D porous carbon/NiNPs nanocomposites. The resulted nanocomposites were carefully characterized by scanning electron microscopy, transmission electron microscopy, N-2 adsorption/desorption isotherms, X-ray powder diffraction, X-ray photoelectron spectroscopy, Raman spectra and electrochemical techniques. The results showed that the NiNPs was acted as the catalyst to result in the transformation of sponge-like pomelo peel into graphene foam-like 3D porous carbon/NiNPs nanocomposites during the carbonization process. The unique catalytic activity, good electrical conductivity as well as the novel structure of the nanocomposites contributed to a perfect electrochemical performance towards the oxidization of glucose, superior to other nanomaterials. The 3D porous carbon/NiNPs nanocomposites were used to construct glucose electrochemical sensor which exhibited a wide linear range (15.84 mu M-6.48 mM) and a low detection limit (4.8 mu M). This study might provide a novel proposal for preparing perfect electrochemical sensor based on porous carbon materials in the electrochemical sensing. (C) 2016 Elsevier B.V. All rights reserved.