Microflowers Comprised of Cu/CuxO/NC Nanosheets as Electrocatalysts and Horseradish Peroxidase Mimics

Preparation of various nanomaterials with hierarchical structure from metal-organic frameworks (MOFs) has attracted lots of attention due to their abundant diversity in composition and structure. In this work, we developed a method to synthesize three-dimensional (3D) Cu/CuxO/NC (nitrogen carbon) composite by pyrolysis of Cu-MOF. The obtained Cu/CuxO/NC composite has flower-like structure assembled with nanosheets. It displays both excellent electrochemical catalytic and mimic enzyme activities. It was successfully applied to fabricate an electrochemical glucose sensor which has a linear response in range of 0-2.0 mM and 2.0-5.0 mM with a detection limit of 3.5 M. And electrochemical measurements indicate that Cu/CuxO/NC modified electrode possesses high selectivity toward glucose. Moreover, Cu/CuxO/NC also acted as horseradish peroxidase (HRP) mimic enzyme and displayed obvious enzymatic catalytic activities for tetramethylbenzidine (TMB) and dopamine (DA) in presence of H2O2. To demonstrate the proof-o...