Novel quantum dot and nano-sheet TiO2 (B) composite for enhanced photocatalytic H2 - Production without Co-Catalyst

JOURNAL OF POWER SOURCES

卷:360

Article

Si, Jingjing¹  Wang, Yu¹  Xia, Xiaohong¹  Peng, Shuai¹  Wang, Ying¹  Xiao, Shuying¹  Zhu, Lingbin¹  Bao, Yuwen¹  Huang, Zhongbing¹  Gao, Yun¹ 

[1] Hubei Univ, Fac Phys & Elect Technol, Fac Mat Sci & Engn, Wuhan 430062, Peoples R China

关键词: TiO2 (B) nano-sheets;    TiO2 nanocomposite;    Hydrogen production;    Photocatalyst;   

DOI  :  10.1016/j.jpowsour.2017.06.021

来源: Elsevier

【 摘 要 】

Recently, the production of hydrogen through water splitting using titania (TiO2) as photocatalyst has received great attention in the new energy field. In this work, a single one-step hydrothermal method is used to synthesize ultra-thin TiO2 (B) nano-sheets, anatase TiO2, and their composite, using ethylene glycol (EG) and ethanol as the solvent. A new composite nanostructure with anatase TiO2 quantum dots grown on TiO2 (B) nano-sheets is obtained at certain ratios between EG and ethanol. Even without the help of co-catalyst, a high photocatalytic efficiency, about 45 times of that of rutile-anatase mixed Degussa P25, is observed in the TiO2 (B)-anatase composite nanostructure. The outstanding performance can be attributed to its large specific surface area, abundant surface active sites, mixed phase promoted efficient charge separation. Moreover, the properly aligned band structure, with the conduction band level of ultra-thin TiO2 (B) about 0.6 eV higher than that of the anatase, provides a large driving force for the reduction of water. (C) 2017 Elsevier B.V. All rights reserved.

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