Electro-catalytic Behavior Of Dual-core Sulfonated Cobalt Phthalocyanine Thiol Compounds Doped Polyaniline Film Preparation And Characterization

The electrochemical polymerization of aniline and binuclear cobalt hexasulfonatephthalocyanine (bi-CoPc) was carried out in sulftiric acid solution. Polymer films were characterized by cyclic voltammetry, UV-VIS-NIR spectroscopy, IR spectroscopy, scanning electron microscope and conduntivity. Bi-CoPc was attached to the surface of glass carbon electrode in aqueous solution by the surfactant. The electrochemistry and electrocatalysis were investigated in alkaline solution of different pH values. The results show that:(1) bi-CoPc has entered into the polymer matrix as counter anions. Cyclic voltammograms exhibit the redox peaks of the phthalocyanine ligands. The peak at 686nm is attributed to the phthalocyanine monomer. When doping, IR spectra show that the characteristic peak of phthalocyanine shifts toward low energy. The micrographs of the films change with increasing bi-CoPc concentrations. But the conductivity change a little because of its srucuture.(2) A heavy aggregation of bi-CoPc in aqueous solution because of hydrogen bond can be redused by producing bi-CoPc-DDAB film electrode. Coverage of electroactive species was estimated by cyclic voltammogramms. The redox of bi-Co Pc/bi-Co PC can mediate the oxidation of 2- mercaptoethanol (2-ME) in alkaline solutions. The increase in current shows a linear dependence on the concentration of 2-ME and the square root of the scan rate. The best result is obtained at pH11.