Abstract
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.
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