Enhancing the capacitance of TiO_2 nanotube arrays by a facile cathodic reduction process

摘要

TiO_2 nanotube arrays are modified by a facile cathodic reduction process treatment and the results are discussed in terms of their electrochemical activity and conductivity. The instrumental characterizations such as X-ray photoelectron spectroscopy and Raman spectroscopy indicate that the formation of oxygen vacancies in the lattice and introduction of hydroxyl groups on the surface of TiO_2 take place. The capacitance of the modified sample is found to be 13 times larger than the pristine TiO_2 nanotube arrays. This work reveals a feasible and simple method to improve electrochemical activity and conductivity of TiO_2 for supercapacitors application.