In this paper, we report enhanced electrochemical capacitance of well-aligned TiO2 nanotube arrays with "nanograss" synthesized by electrochemical anodization. The conductivity of hybrid materials is improved by electrochemical reduction method, exhibiting an outstanding specific capacitance of 14.3 mF cm (2), which is 14 times larger than pristine ones. The specific capacitance further increases up to 20.5 mF cm (2), which is 43.4% higher than reduced ones with selectively retention of "nanograss" by ultrasonic treatment. We expect that the electrochemical-reduction approach and controllable morphology modification offer a potential path for developing high-performance energy storage devices. (C) 2016 Elsevier Ltd. All rights reserved.