Fabrication And Catalytic Property Of Hybrid Nanostructured Materials Towards Glucose Oxidation From ZrAlCo-based Amorphous Alloys

The measurement of glucose concentration is of great importance not only in the examination of diabetic patients,but also in the food industry,pharmaceutical manufacturing and environmental monitoring fields.Enzyme-based glucose sensors are now the mainstay of the market.However,complex enzyme immobilization,and instability of the enzymes limit the application of them.Therefore,the development of low-cost,highly stable and simple non-enzymatic glucose sensors has become an interesting research topic.With the development of nanotechnology,various nanostructured materials of transition group metals,metal alloys and metal oxides are widely used for the preparation of non-enzymatic electrochemical glucose sensors due to their low cost,environmental friendliness and excellent electrochemical properties.In this work,the effect of nanostructured electrodes prepared from Zr56Al16Co28-xNix amorphous alloy as precursors on the catalytic performance of glucose was investigated,and on this basis,nanostructured composite electrodes were prepared by the combination of oxides and sulphides to further improve the performance of catalytic oxidation of glucose.The main results of this thesis are listed as follows:(1)Nanostructured electrodes were prepared by electrochemical anodic oxidation by using Zr56Al16Co28-xNix(x=0,1,5,10 at.%)amorphous alloy as precursors.The effects of Ni content in the amorphous alloy precursors and the anodic oxidation voltage on the nanotube morphology and glucose oxidation were systematically investigated.(2)NiO-NiCl2/ZAC-O nanocomposite electrodes were prepared by hydrothermal method based on ZAC-O electrode in NiCl2·6H2O containing solution.As the amount of NiCl2 6H2O added to anhydrous ethanol increasing,nanosheets were gradually generated and coarsened,and the NiO-NiCl2/ZAC-O-3 electrode obtained with the addition of 1.02 mmol NiCl2·6H2O exhibits the optimum performance towards the glucose oxidation with sensitivities of 2289μAmM-1cm-2(0-1 mM)and 1254 μAmM-1cm-2(1-3 mM).(3)Amorphous Ni-Co-S/ZACN-O electrodes were prepared by depositing ternary Ni-Co-S nanosphere clusters on ZACN-O electrodes by using cyclic voltammetry.The unique amorphous nanosphere clusters were prepared,and the composite amorphous nanotubes have a larger active specific surface area.The amorphous Ni-Co-S/ZACN-O nanostructured electrode has excellent catalytic activity for the catalytic oxidation of glucose with a high sensitivity of 2603 μAmM-1cm-2 within a wide detection range of 0.01 mM-6 mM,and a low detection limit of 0.340 μM(S/N=3),as well as superior selectivity and long-term stability.The as-prepared hybrid electrode exhibits high application potential in the field of glucose detection.