The photocatalytic splitting of water into H 2 and O 2 by oxide nanoparticles has received much attention. However, the full potential of photo-catalysts for efficient hydrogen generation out of water has not been fully realized yet due to unresolved limitations including the low electrical conductivity and ineffective carrier extraction. Here, we report composite oxide materials consisting of 1-dimensional (1-D) transparent conducting oxide (TCO) core and TiO 2 shell. Highly conductive ITO nanowires were grown on a flexible SUS mesh as a core component. The photoelectrodes consisting of these 1-D nanocomposites have increased carrier mobility due to the TCO core, while the TiO 2 shell provides the photocatalytic functionalities. In addition, the built-in-potential at the interface between TCO core and the TiO 2 shell improves the collection of charge carriers from TiO 2 to TCO. These factors altogether contribute to increasing the photocurrent of the device under light.