Polyaniline/carbon doped TiO2composite nanotube arrays (PANI/C-TiO2NTAs) have been prepared successfully by electrodepositing PANI in C-TiO2NTAs which were prepared by directly annealing the as-anodized TiO2NTAs under Ar atmosphere. The organic residual in the TiO2NTAs during the process of anodization acts as carbon source and is carbonized in Ar atmosphere to manufacture the C-TiO2NTAs. The specific capacitance of the PANI/C-TiO2electrode is 120.8 mF cm−2at a current density of 0.1 mA cm−2and remains 104.3 mF cm−2at a current density of 2 mA cm−2with the calculated rate performance of 86.3%. After 5000 times of charge-discharge cycling at a current density of 0.2 mA cm−2, the specific capacitance retains 88.7% compared to the first cycle. All these outstanding performances of the as-prepared PANI/C-TiO2NTAs indicate it will be a promising electrode for supercapacitor.
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