Abstract
Composite electrodes prepared by electrodeposition of manganese oxide on titanium substrates modified with poly(3-methylthiophene) (PMeT) were investigated and compared with Ti/MnO 2 electrodes. The polymer films were prepared by galvanostatic deposition at 2 mA cm −2 with different deposition charges (250 and 1500 mC cm −2). The electrodes were characterized by cyclic voltammetry in 1 mol L −1 Na 2SO 4 and by scanning electron microscopy. The results show a very significant improvement in the specific capacitance of the oxide due the presence of the polymer coating. For Ti/MnO 2 the specific capacitance was of 122 F g −1, while Ti/PMeT 250/MnO 2 and Ti/PMeT 1500/MnO 2 displayed values of 218 and 66 F g −1, respectively. If only oxide mass is considered, the capacitances of the composite electrode increases to 381 and 153 F g −1, respectively. The micrographs of samples show that the polymer coating leads to very significant changes in the morphology of the oxide deposit, which in consequence, generate the improvement observed in the charge storage property.
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