Non-enzymatic Glucose Electrochemical Sensing Electrode Based on NiCo2O4 and NiCo2S4
NiCo2 O4 and NiCo2 S4 nanoneedle clusters with spinel structure were synthesized by oxidation and sulfuration of Ni-Co precursor,respectively.The products were applied as electrocatalyst and modified on indium tin oxide(ITO)conductive glass to construct non-enzymatic glucose sensing electrode.The effects of anion species in Ni-Co bimetallic compounds on the electrocatalytic oxidation of glucose were investigate.The results indicated that NiCo2 S4 based sensing electrodes had higher electrocatalytic activity and faster electron transfer rate than those of NiCo2O4.NiCo2O4/ITO electrode displayed a sensitivity of 81.8 μA/(mmol/L)·cm2 in the linear range of 0.1-0.7 mmol/L.In comparison,NiCo2S4/ITO electrode owned a larger linear range within 0.1-2.0 mmol/L and the sensitivity of NiCo2S4/ITO electrode increased to 166.8 μA/(mmol/L)·cm2.Moreover,great selectivity,stability and reproducibility were also obtained by the NiCo2 S4/ITO electrode,indicating the good application prospect in the glucose detection.