Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (3): 395-400.DOI: 10.1016/S1872-2067(17)62963-2

• Communications • Previous Articles     Next Articles

Two-step hydrothermal synthesis of Sn2Nb2O7 nanocrystals with enhanced visible-light-driven H2 evolution activity

Chao Zhoua, Run Shia,b, Lu Shanga, Li-Zhu Wua, Chen-Ho Tunga, Tierui Zhanga,b   

  1. a Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-09-27 Revised:2017-10-29 Online:2018-03-18 Published:2018-03-10
  • Contact: 10.1016/S1872-2067(17)62963-2
  • Supported by:

    This work was supported by the Ministry of Science and Technology of China (2014CB239402, 2013CB834505), the National Key Projects for Fundamental Research and Development of China (2016YFB0600901, 2017YFA0206904, 2017YFA0206900), the National Natural Science Foundation of China (51772305, 51572270, U1662118, 21401207), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17000000), and the Youth Innovation Promotion Association of the CAS.

Abstract:

We use a two-step hydrothermal method to successfully synthesize Sn2Nb2O7 nanocrystals with an average size of approximately 20 nm. The as-obtained samples are characterized by powder X-ray diffraction, ultraviolet-visible diffuse reflectance spectroscopy, Brunauer-Emmett-Teller analysis, scanning electron microscopy, and transmission electron microscopy. The photocatalytic activity of the Sn2Nb2O7 nanocrystals is evaluated by photocatalytic water splitting under visible light irradiation. The Sn2Nb2O7 nanocrystals with a large surface area of 52.2 m2/g show an enhanced visible-light-driven photocatalytic H2 production activity, approximately 5.5 times higher than that of bulk Sn2Nb2O7 powder. The higher photocatalytic activity of Sn2Nb2O7 nanocrystals is mainly attributed to its relatively high dispersity of nanosized particles and larger specific surface area when compared with the bulk powder.

Key words: Hydrothermal synthesis, Sn2Nb2O7, Photocatalysis, Water splitting, Visible-light-driven