Achieving Synergy with a Potential Photocatalytic Z-Scheme: Synthesis and Evaluation of Nitrogen-Doped TiO2/SnO2 Composites

作者：Xu Lin; Steinmiller Ellen M P; Skrabalak Sara E^*

来源：Journal of Physical Chemistry C, 2012, 116(1): 871-877.

DOI：10.1021/jp208981h

Nitrogen-doped titania (N-TiO2)/tin oxide (SnO2) composites were synthesized and evaluated as photocatalysts for the first time. These composites represent a potential new class of Z-scheme photocatalysts wherein the enhanced light absorption properties of N-TiO2 are anticipated to couple with the observed benefits of composite TiO2/SnO2 systems. The N-TiO2/SnO2 composites were characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N-2-adsorption, diffuse reflectance spectroscopy (DRS), electron paramagnetic resonance (EPR) spectroscopy, and scanning electron microscopy (SEM). It was found that composites with low SnO2 content display enhanced photocatalytic properties under visible light irradiation when compared to standards:. TiO2, N-TiO2, SnO2, and TiO2/SnO2 composites. This enhancement is attributed to a synergistic effect between the two composite components and changes in the textural properties of the materials upon composite formation. Significantly, the enhanced performance demonstrates the importance of evaluating new composite photocatalysts.

• 出版日期2012-1-12