A novel ascorbic acid electrochemical sensor based on spherical MOF-5 arrayed on a three-dimensional porous carbon electrode

摘要

In this work, the spherical porous MOF-5 microstructures supported by three-dimensional (3D) kenaf stem-derived porous carbon (KSC) (denoted as MOF-5/3D-KSC) composites were constructed for ascorbic acid (AA) sensing. The formation of MOF-5/3D-KSC was verified by scanning electron microscopy, X-ray powder diffraction and energy dispersive X-ray spectroscopy. The results showed that spherical porous MOF-5 microstructures were evenly arrayed on the surface of 3D-KSC via a simple one-step hydrothermal method, which could greatly increase the effective surface area, stability and active sites. The MOF-5/ 3D-KSC composites were directly used to prepare integrated MOF-5/3D-KSC electrodes for AA sensing, and the integrated electrodes showed better performance for AA detection than traditional enzymebased sensors and nonenzymatic sensors. The sensor exhibited good stability, wide linear range (0.7 mu M to 11.5 mM) and low detection limit (0.24 mu M). Hence, the MOF-5/3D-KSC composites could be a potential material for sensing platforms.