Preparation Of Transition Metal Compound Nanomaterials And Their Electrocatalytic Application

The development of nanotechnology has promoted the material science into a new era.Nanomaterials are widely used in scientific research due to their excellent properties and are often used to prepare nanoscale electrodes.The qualitative and quantitative detection of glucose plays a very important role in biotechnology,food analysis,environmental testing,and the pharmaceutical industry.Traditional enzyme-based electrochemistry glucose sensors because of the instability and high price of enzyme and the complexity of enzyme immobilization techniques have promoted the emergence of enzyme-free electrochemical glucose sensors.Non-noble transition metal nanomaterials are preferred materials for enzyme-free electrochemical glucose sensing research due to their advantages of low cost,low toxicity and excellent electrocatalytic performance.Transition metal oxides and their hydroxides have gradually withdrawn from the field of electrochemical analysis because of their poor conductivity and low catalytic activity.In recent years,transition metal sulfides,phosphides and nitrides have attracted widespread attention due to their excellent electrical conductivity and electrocatalytic properties.Thus,based on the reported literature results and the existing research of our laboratory,this paper prepared three types of nanomaterial electrodes and explored their performances on glucose oxidation.1?Herein,we reported the process of preparing Ni-Co-S nanosheets film?Ni-Co-S/TM?electrode by one setp electrodeposition,and the performance of electrooxidation of glucose catalyzed by samples prepared with different cycles was also investigated.Cyclic voltammetry and Chronoamperometry were used for electrooxidation of glucose on Ni-Co-S/TM electrodes.Taking the Hg/HgO as reference electrode,platinum wire as counter electrode,Ni-Co-S/TM electrode as working electrode,and 0.1 M NaOH solution as electrolyte.Electrochemical tests demonstrated that the Ni-Co-S/TM electrode prepared by15 cycles has the best performance in catalyzing the oxidation of glucose.As a enzyme-free electrochemical glucose sensor,this Ni-Co-S/TM catalyst electrode shows a wide linear range of 0.001 to 3 mM,a high sensitivity of 3291.5?A mM^-1 cm^-2,and a low limit of detection?LOD?of 0.12?M?S/N=3?.Besides,it also exhibits good reproducibility,excellent stability and selectivity for glucose detection.This results show significant advantages over other reported non-enzymatic electrochemical glucose sensors built on the basis of Co and Ni.2?In this work,we reported the preparation process of CoP-Fe₂P nanosheet array?CoP-Fe₂P NA/TM?electrode by combining hydrothermal and vapor deposition,The electrocatalytic properties of the electrode materials prepared by the precursor solutions with different Co and Fe ratios were investigated.The potential of electrochemical oxidation of glucose by CoP-Fe₂P NA/TM is performed in a three-electrode system using Hg/HgO as reference electrode,platinum wire as counter electrode,and CoP-Fe₂P NA/TM electrode is working electrode.0.1 M NaOH solution is the electrolyte,cyclic voltammetry and chronoamperometry are test systems.The results showed that the CoP-Fe₂P NA/TM electrode obtained with Co:Fe=4:1 had the best catalytic performance for glucose oxidation.As an non-enzymatic electrochemical sensor for glucose detection,such CoP-Fe₂P NA/TM shows a wide detection range of 0.1?M to 2.0 mM,a response sensitivity of 4541.9?A mM^-1 cm^-2,and a LOD of 13 nM?S/N=3?.This sensor is also stable with high selectivity and reproducibility.It has significant advantages over other reported non-enzymatic electrochemical glucose sensors built on the basis of Co,Fe and P.In the measurement of the actual sample,the relative standard deviation of the detection value obtained by the target electrode and the measured value of the commercial blood glucose meter is 4%.3?In this work,the Co₃N nanowire array?Co₃N NW/TM?was prepared on TM by hydrothermal method combined with vapor deposition method,and its performance as an enzyme-free electrochemical glucose sensor was also studied.The electrocatalytic performance of Co₃N NW/TM electrode for glucose oxidation was explored by three-electrode system.Taking the Hg/HgO as reference electrode,platinum wire as counter electrode,and Co₃N NW/TM electrode as working electrode.0.1 M NaOH solution is an electrolyte,and cyclic voltammetry and chronoamperometry are test systems.The results of the investigation indicated that the Co₃N NW/TM electrode has excellent performance in electrocatalytic oxidation of glucose.Electrochemical tests suggest that as a non-enzymatic electrochemical sensor for glucose detection,this fabricated electrode offers a wide linear range from 0.1?M to 2.5 mM,with a high sensitivity of 3325.6?A mM^-1 cm^-2,a LOD of 50nM?S/N=3?,and satisfactory selectivity,stability and reproducibility.It has significant advantages over other reported non-enzymatic electrochemical glucose sensors built on the basis of Co.In the measurement of the actual sample,the relative standard deviation of the detection value obtained by the target electrode and the measured value of the commercial blood glucose meter is 2%.