Zn x Cd 1−x Se (0 ≤ x ≤ 1) nanocrystals were pulse electrodeposited onto the surface of anatase TiO 2 nanotube arrays for the first time. The pulse-electrodeposition duty cycle plays a determinative role during the nuclei formation and growth process of the Zn x Cd 1−x Se nanocrystals. The composite Zn x Cd 1−x Se/TiO 2 nanotube arrays exhibit high absorption in the visible light region due to the narrow band gap of Zn x Cd 1−x Se and demonstrate a sensitive photoelectrochemical response under visible light illumination with an optimal response achieved for Zn 0.8 Cd 0.2 Se/TiO 2 electrodes. In photoelectrochemical testing, 9-anthracene carboxylic acid acts as a hole donor resulting in a decrease of the measured photocurrent response. In contrast, 2-anthramine acts as an electron donor, resulting in an increase of the photocurrent response.
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