In this study, a heterostructured SrTiO3/TiO2 nanostructure was fabricated in situ by a hydrothermal method, using TiO2 nanotubes (NTs) as both the template and a reactant. SrTiO3 was synthesized in strontium hydroxide solutions with different Sr2+ concentrations. At a Sr2+ concentration of 0.1 M, the TiO2 NT morphology was maintained, and SrTiO3 nanoparticles assembled evenly on the TiO2 NT surface (SrTiO3/TiO2 NTs). With the Sr2+ concentration increasing, the SrTiO3/TiO2 NT morphology changed into SrTiO3/TiO2 nandlowers (NFs). The photoelectrochernical properties of different nanostructures were also evaluated. The photoelectrochernical activity of SrTiO3/TiO2 NTs was higher than those of pure TiO2 NTs and SrTiO3/TiO2 NFs because of SrTiO3 incorporation and its tubular structure. SrTiO3/TiO2 NFs showed the poorest photoelectrochemical activity. It can be attributed to destruction of the tubular structure. Our findings provide fundamental insights into the fabrication and utility of SrTiO3/TiO2 NTs for enhanced environmental remediation processes. (C) 2013 The Electrochemical Society. All rights reserved.