SrNb₂O₆ nanotubes with enhanced photocatalytic activity

SrNb₂O₆ having a rhombic nanotubular structure with a diameter of 300 nm, average length of 3 μm and wall thickness of 50 nm was synthesized via a facile hydrothermal route. The prepared powders were characterized using X-ray diffraction, field-emission electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. Compared to the same material prepared by the solid-state reaction method, the rhombic nanotubes of SrNb₂O₆ exhibited enhanced photocatalytic activity for the production of H₂ from pure water, which was mainly attributed to their higher surface area. Moreover, the increased optical absorption properties resulting from the variation of the crystal structure also contributed to their higher photocatalytic activity.