Effects of exposed facets on photocatalytic properties of WO3

摘要

Hexagonal WO3 (h-WO3) was prepared by using Na2SO4 and (NH4)(2)center dot SO4 as capping agents under different hydrothermal conditions. XRD, SEM and TEM results indicated that three types of morphologies, including h-WO3 rods with exposed (2 0 0) facets, h-WO3 nanosheets with exposed (0 0 2) facets and h-WO3 with corn cob-like structure and no preferred direction, could be obtained by tuning the capping agents and pH. Specifically, h-WO3 nanosheets with exposed (0 01) facets have the best visible photocatalytic properties due to its high specific surface area and charge separation nature on the (0 0 2) high energy facets. (C) 2017 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.