The Preparation Of Electrodes Modified By Polyaniline/polyvanadat Film And Their Electrochemical Properties

With excellent catalytic properties, polyoxometalates （POMs） have attracted us to paygreat attention in the research of the electrocatalytic and chemical modified electrodes. In thispaper, major research on the preparation of polyvanadate and polyaniline/polyvanadat filmmodified electrodes with immersion method, electrochemical method and and layer-by-layerassembly technique, and focus on the electrochemical and electro-catalytic properties.The vanadic acid(H₂V₁₂O_31-y·nH₂O), Poly-Vanadium-titanium acid (H₂V_12-xTixO_31-y·nH₂O（0≤x≤8）), Poly-vanadium-molybdenum acid (H₂V_12-xMo_xO_31-y·nH₂O （0≤x≤8） wereprepared by sol-gel method, and futher preparation the Polyvanadate film modified electrodewith electrochemical method and immersion method, and research of the electrochemical andelectrochemical catalytic properties. Result shows that the modified electrodes have relativelystable electrochemical properties and good electrocatalytic properties to I03-.The polyaniline/H₂V₁1Ti₁O_31-y(H₂V₁1Mo₁O_31-y) inorganic and organic compound filmmodified electrodes were prepared by one-step method and two-step method, results showedthat compound films were prepared by one-step method have the better electrochemicalactivity. After polyvanadat acid compound with polyaniline, enhanced the electrochemicalactivity of modified electrodes and electro-catalytic properties to I0₃^-. The catalytic activity ofPolyaniline/H2V11Ti1O31-yis better than Polyaniline/H₂V₁1Mo₁O_31-y.In the same time, thecatalytic activity of Polyaniline/H2V11Ti1O31-yto H2O2and NaNO2were also studied, have thecatalytic oxidation catalytic reduction function to them.The （PDDA/PSS）m/(PAn/H₂V_12-xTi_xO_31-y)ncompound films were prepared by layer-by-layer self-assembly technology on the surface of quartz glass and ITO conducting glass,characterized by UV spectrophotometry and electrochemical methods. The result indicatesthat the growth of self-assembly compound films are uniform continuity, compared with thosefilms prepared by electropolymerization, the electrochemical stability are lower, but havegood electrocatalytic properties to I0₃^-.