Herein, a flame-assisted pyrolysis technique is developed for one-step in-situ construction of Cu2O/Cu/TiO2 nanotube arrays. The structure and morphology of the obtained samples are systematically characterized. Interestingly, UV-vis absorption spectroscopy reveals that the introduction of Cu2O and Cu considerably enhance light response of TiO2 nanotube arrays in the visible region. Moreover, the composited electrode shows enhanced photo-electrochemical activity. Compared with blank TiO2 nanotube arrays, not only the photocurrent and photo-voltage of composited electrodes are improved but also the stability is also enhanced. And, the maximum photo-conversion efficiency for composited electrode presents 4.71 folds larger than that of blank TiO2 electrode. This enhancement is due to the faster charge separation/transportation ability of Cu and visible light response of Cu2O. This research develops a novel and facile method for the in-situ fabrication of Cu2O/Cu/TiO2 nanotube arrays and demonstrates their improved utilization of solar energy. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.