Fabrication of Hierarchically Structured MOF-Co3O4 on Well-aligned CuO Nanowire with an Enhanced Electrocatalytic Property

Engineering appropriate shape and size of three-dimensional inorganic nanostructures materials is of one the main critical problems in pursuing high-performance electrode materials. Herein, we fabricate a metal-organic framework derived cobalt oxide (Co3O4) are grown on copper oxide nanowire (CuO NWs) supported on the surface of 3D copper foam substrate. The highly aligned CuO NWs were prepared by using electrochemical anodization of copper foam in ambient temperature and followed by MOF Co3O4 was grown via a simple in situ solution deposition then consequent calcination process. The obtained binder-free 3D CuO NWs@Co3O4 nanostructures were further characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, and transmission electron microscopy. Furthermore, electrochemical sensing of glucose was studied by using Cyclic Voltammetry, and chronoamperometry techniques. Interestingly, 3D CuO NWs@Co3O4 electrode exhibits excellent performance for the oxidation of glucose compared with individual entities. The proposed sensor shows wide linear ranges from 0.5 mu M to 0.1 mM with the sensitivity of 6082 mu A/mu M and the lowest detection limit (LOD) of 0.23 mu M was observed with the signal to noise ratio, (S/N) of 3. The superior catalytic oxidation of glucose mainly is endorsed by the excellent electrical conductivity and synergistic effect of the Co3O4 and CuO NWs.