Effect of different processes and Ti/Zn molar ratios on the structure, morphology, and enhanced photoelectrochemical and photocatalytic performance of Ti3+ self-doped titanium-zinc hybrid oxides

JOURNAL OF POWER SOURCES

卷:285

Article

Fu, Rongrong¹  Wang, Qingyao¹  Gao, Shanmin^1,2  Wang, Zeyan²  Huang, Baibiao²  Dai, Ying²  Lu, Jun³ 

[1] Ludong Univ, Coll Chem & Mat Sci, Yantai 264025, Peoples R China

[2] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China

[3] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA

关键词: Ti3+ self-doped;    Hybrid oxides;    Heterojunction;    Hydrogen production;    Visible light photocatalyst;   

DOI  :  10.1016/j.jpowsour.2015.03.070

来源: Elsevier

【 摘 要 】

Ti3+ self-doped titanium-zinc hybrid oxides with different phase compositions and morphologies were successfully synthesized using Zn powder as the reductant and Zn source by a chemical-reduction precipitation method with subsequent thermal treatment. The fabricated Ti3+ self-doped TiO2(A)/TiO2(R), TiO2(A)/TiO2(R)/ZnTiO3, and TiO2(A)/ZnO heterojunctions were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The effects of various Ti/Zn molar ratios and preparation processes on the structural, morphological, optical, photocurrent and photocatalytic properties of the resultant samples were investigated systematically. Results reveal that Ti3+ self-doping enhances the photoabsorption capability of titanium-zinc hybrid oxides in the visible-light region. Moreover, different processes and Ti/Zn molar ratios play great influences on the structure, morphology, optical, photocurrent and photocatalytic properties of the final products. Ti3+ self-doped titanium-zinc hybrid oxides exhibit excellent photocurrent and photocatalytic activity than pure TiO2 and ZnTiO3 under visible-light irradiation (lambda >= 400 nm). The most active Ti3+ self-doped titanium-zinc hybrid oxides photoanode presents significantly improved water splitting performance. The synergistic effect between the Ti3+ self-doped and heterojunctions is responsible for the enhanced performance of these materials. Published by Elsevier B.V.

【 授权许可】

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