Construction of Snow-Cake Like NiCo2O4 Nanostructures Modified Electrode Material and Its Electrocatalytic Oxidation of Glucose.

Transition bimetal oxides are widely used in the field of electrochemical sensing because of their variable valence and bimetallic synergies. In this work, we demonstrate the facile synthesis of snow-cake like NiCo2O4 nanostructures and its application as a working electrode modification material in enzyme-free glucose electrochemical sensing field. In a three-electrode system, the electrocatalytic oxidation activity for glucose of NiCo2O4 nanostructures is tested. The snow-cake like NiCo2O4 nanostructures are endowed with superior electron-transfer capability, large surface area, and abundant intrinsic redox couples of Ni2+/Ni3+ and Co2+/Co3+ ions. The modified electrode exhibits excellent glucose-sensing properties, such as detection of wide range of glucose concentrations with good linearity and high sensitivity of 983 μA mM−1 cm−2 at 0.45 V operating potential. Moreover, the interference from the commonly interfering species such as ascorbic acid (AA), sodium chloride (NaCl) and uric acid (UA) can be effectively avoided. [ABSTRACT FROM AUTHOR]