Herein, we report surface coarsened titanium dioxide (TiO2) nanobelts with anatase/rutile heterophase junctions via a facile hydrothermal/calcination method for simultaneous hydrogen (H-2) and oxygen (O-2) productions from pure water, with excellent production rates of 0.614 and 0.297 mmol h(-1) g(-1) with platinum (Pt)/cobalt phosphide (CoP) as cocatalysts, respectively. Besides, the TiO2 nanobelts-900 degrees C with anatase/rutile heterophase junctions show a notable improvement in photocatalytic H-2 and O-2 production than pure anatase TiO2 nanobelts (TiO(2)nanobelts-600 degrees C, 700 degrees C and 800 degrees C) and pure rutile TiO2 nanobelts (TiO(2)nanobelts 1000 degrees C). The anatase/rutile heterophase junctions could effectively stimulate the transfer of electrons from rutile to anatase and then to Pt, and H-2 generation on the surface of Pt. In the meantime, the holes can be transferred from anatase to rutile and then to CoP, and water oxidation on CoP's surface. (C) 2020 Elsevier Inc. All rights reserved.