The Electrocatalytic Properties And Analytical Application Of Methanol, Formaldehyde On The Prussian Blue Analogue Chemically Modified Electrode

Chemically modified electrodes (CMEs) was one of the active research areas in modern electrochemistry and electroanalytical chemistry. Due to its good chemical properties and electrochemical properties, polynuclear metal hexacynoferrates, especially Prussian blue widely used in determination, bio-sensor, battery electrode materials, solid state batteries and so on. For these reasons, this paper aimed to develop a novel type of Prussian blue analogue chemically modified electrode, improving their electrocatalytic activity and analytical performance, expanding its applications in the electroanalytical chemistry field.A novel type of Prussian blue analogue chemically modified electrode was prepared by means of electrodeposition in this paper. It was discovered the electrocatalytic oxidation of methanol on the modified electrode for the first time, and the capacity of tolerated intermediates poison; It was unearthed for the electrocatalytic oxidation and determination of formaldehyde.There were four chapters in this paper:Chapter one: This part introduced briefly the following aspects: firstly,it was summed up the characteristics, preparation,characteristics and electroanalytical applications of Prussian blue and Prussian blue chemically modified electrode, and outlined the future prospects of the rare earth hexacyanoferrates chemically modified electrode. Secondly it was descripted the development and problems of the direct methanol fuel cell (DMFC), and list the literatures about the electrocatalytic oxidation behavior of methanol on the platinum anode catalyst and composite anode catalyst. In addition, it was introduced the hazards and the conventional detection methods of formaldehyde, and detection of formaldehyde on the chemically modified electrode.Chapter two: The Eu-Fe film modified electrode was prepared by means of electrodeposition and the electrocatalytic oxidation of methanol on the modified electrode was discovered for the first time. It was proved that the oxidation current of methanol in the modified electrode increased more than about 20 times, a slight negative shifted of peak potential of methanol oxidation and the electrode tolerated intermediates poison strongly by comparing cyclic voltammetry data of the electrocatalytic oxidation of the methanol at the modified electrode and the bare platinum electrode.Chapter three: The Nd-PB/Pt modified electrode was prepared by means of electrodeposition and discovered that there exist the electrocatalytic oxidation activity for formaldehyde and enhenced tolerated poison effect on the modified electrode. By comparing cyclic voltammetry data of the electrocatalytic oxidation of formaldehyde at the modified electrode and the bare platinum electrode, it was found that the oxidation current of formaldehyde on the modified electrode increased more than about 3 times, peak potential of formaldehyde oxidation shifted slight negatively. The modified electrode possessed good stability and reproducibility.Chapter four: After the Nd-PB/Pt modified electrode was prepared by means of electrodeposition, the electrodeposied platinum particles was attached on the modified electrode surface by means of constant potential electrolysis, in order to manufacture the platinum particles/Prussian blue composite film modified electrode(Pt/Nd-PB/Pt). This composite film modified electrode was successfully applied to determination of formaldehyde, and obtained good linearity in the formaldehyde concentration range of 1×10-4～1×10-2 mol/L with detection limit 5×10-5 mol/L under the optimum conditions. The proposed method was applied to the determination of formaldehyde in imitative Yellow water samples and imitative water samples with the recovery of 95.6%～103.4% and good results.