Fabrication of TiO2 hierarchical architecture assembled by nanowires with anatase/TiO2(B) phase-junctions for efficient photocatalytic hydrogen production

摘要

TiO2 hierarchical architecture assembled by nanowires with anatase/TiO2(B) phase-junctions was prepared by a hydrothermal process followed by calcinations. The optimum calcination treatment (450 degrees C) not only led to the formation of anatase/TiO2(B) phase-junctions, but also kept the morphology of 1D nanowire and hierarchical architecture well. The T-450 load 0.5 wt% Pt cocatalysts showed the best photo catalytic hydrogen production activity, with a maximum hydrogen production rate of 7808 mu mol g(-1) h(-1). The high photocatalytic activity is ascribed to the combined effects of the following three factors: (1) the hierarchical architecture exhibits better light harvesting; (2) the larger specific surface area provides more surface active sites for the photocatalytic reaction; (3) the 1D nanowires and anatase/TiO2(B) phase junctions both can enhance the separation of photoinduced electron-hole pairs and inhibit their recombination. (C) 2017 Elsevier B.V. All rights reserved.