Hierarchical Macro-Mesoporous Ni(OH)₂for Nonenzymatic Electrochemical Sensing of Glucose

Hierarchical macro-mesoporous Ni(OH) 2 were prepared by hydrothermal treatment of Ni(NO 3 ) 2 with dicyandiamide. This Ni(OH) 2 nanostructure can be transformed to mesoporous NiO via calcination at 300°C. The structure, morphology and textural properties of the as-synthesized Ni(OH) 2 and NiO were characterized. The electrochemical property and electrochemical sensing performance toward glucose detection were investigated. Owing to the unique macro-mesoporous structure, the Ni(OH) 2 nanostructure could provide amperometric sensing of glucose with wide linear range (0.01–8.3 mM), high sensitivity of 243 μA mM cm −2 and low detection limit of 1 μM. Moreover, this glucose sensor also exhibited excellent stability, good selectivity and reproducibility.