Preparation Of Carbon Black-nickel-cobalt Metal Oxide Nanocomposites And Their Application In Electroanalytical Chemistry

Electrochemical sensors have the advantages of low cost,strong stability,simple operation and so on,and are widely used in the fields of biotechnology,chemistry and so on.Some researchers have used transition metal oxide materials as electrochemical sensor materials.Ni O,for example,has demonstrated excellent electrochemical properties.In binary transition metal oxides,NiCo₂O₄is a kind of good sensor material with a wide performance,economy,safety,environmental protection and high electrochemical catalytic activity.In addition,NiCo₂O₄sensor material has higher electrochemical activity and conductivity than Ni O.Carbon black is a popular catalyst carrier because of its excellent electrical conductivity,high surface area and chemical stability.Ni O and NiCo₂O₄were synthesized through hydration at low temperature.Thereafter,carbon black was used as catalyst carrier to increase the conductivity and enhance the electrochemical signal.The application of carbon black nickel cobalt oxide in electroanalytical chemistry is studied in this paper.The main contents are the following three parts:?.Preparation of TiO₂/CB modified electrode and electrochemical determination of DAIn this work,TiO₂/CB nanomaterials were synthesized as electrode materials for electrochemical detection of dopamine(DA).We use cyclic voltammetry(CV),time-current curve method(I-T)and electrochemical impedance(EIS)to explore the electrochemical behavior of the electrode.The results showed that the modified TiO₂/CB electrode could detect DA,and the linear range of detection was 0.05?50?mol·L^-1,50?400?mol·L^-1.The detection limit was 0.02?mol·L^-1(S/N=3).The experimental results show that TiO₂/CB-GCE has a good response to DA and can be used in practical applications.?.Preparation of TiO₂/CB-Ni O modified electrode and its electrochemical determination of N₂H₄·H₂SO₄In this work,TiO₂/CB-Ni O nanomaterials were synthesized as electrode materials,which were used for electrochemical detection of N₂H₄·H₂SO₄.We use cyclic voltammetry(CV),time-current curve method(I-T)and electrochemical impedance(EIS)to explore the electrochemical behavior of the electrode.The results show that the modified TiO₂/CB-Ni O electrode can detect N₂H₄·H₂SO₄,and the linear range of detection is:1?120?mol·L^-1,120?920?mol·L^-1,The detection limit was0.101?mol·L^-1(S/N=3).The experiment shows that TiO₂/CB-Ni O/GCE has a good response to N₂H₄·H₂SO₄,which can be used in practical applications.?.Preparation of TiO₂/CB-NiCo₂O₄modified electrode and its electrochemical determination of Glucose and DAIn this work,TiO₂/CB-NiCo₂O₄nanomaterial was synthesized as electrode material for electrochemical detection of glucose and DA.We use cyclic voltammetry(CV),time-current curve method(I-T)and electrochemical impedance(EIS)to explore the electrochemical behavior of the electrode.The results showed that the modified TiO₂/CB-NiCo₂O₄electrode could detect glucose and DA,and the linear ranges of detection ware 0.001?1.78 mmol·L^-1and 0.05?138 138?638?mol·L^-1,respectively.The detection limits ware 1.53?mol·L^-1(S/N=3)and 0.014?mol·L^-1(S/N=3),respectively.The experimental results show that TiO₂/CB-NiCo₂O₄/GCE has good response to glucose and DA,and can be used in practical applications.