Engineering multi-stage nickel oxide rod-on-sheet nanoarrays on Ni foam: A superior catalytic electrode for ultrahigh-performance electrochemical sensing of glucos

Hierarchical nanoarray is an appealing architecture for molecular recognition on account of its larger surface area and easier accessibility for target molecules compared with single-stage nanoarray and traditional nanoparticle. Herein, we demonstrate that surface-engineering of multi-stage nickel oxide rod-on-sheet nanoarrays on Ni foam (NiO NS@NR/Ni foam) exhibits ultra-high catalytic activity toward electro-oxidation of glucose. When used for nonenzymatic sensing of glucose, this NiO NS@NR/Ni foam electrode shows a wide response range of 0.75-3837 μM, a low determination limit of 0.75 μM, a high sensitivity of 2739.5 μA mM−1 cm−2, and a fast response time of less than 4 s. This proposed sensor also demonstrates high selectivity, good long-term stability and practicability in real human serum samples for glucose detection.