MoO_3- -deposited TiO₂ nanotubes for stable and high-capacitance supercapacitor electrodes

Here we report the supercapacitive properties of a novel MoO_3- /TiO₂ nanotube composite prepared by a facile galvanostatic deposition technique and subsequently thermal treatment in an argon atmosphere between 350 °C and 550 °C. X-ray diffraction and X-ray photoelectron spectroscopy confirm the existence of MoO_3- . The MoO_3- /TiO₂ electrode prepared at 550 °C exhibits a high specific capacitance of 23.69 mF cm^-2 at a scan rate of 10 mV s^-1 and good cycling stability with capacitance retention of 86.6% after 1000 cycles in 1 M Na₂SO₄ aqueous solution. Our study reveals a feasible method for the fabrication of TiO₂ nanotubes modified with electroactive MoO_3- as high-performance electrode materials for supercapacitors.