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Visible light in situ driven electron accumulation at the Ti-Mn-O-3 sites of TiO2 hollow spheres for photocatalytic hydrogen production

文献类型： 外文期刊

作者： Zhang, Yujiao 1 ; Wang, Yan 3 ; Zhao, Dan 2 ; Wang, Baoyu 4 ; Pu, Ling 5 ; Fan, Meng 1 ; Liang, Xingtang 4 ; Yin, Yanzhen 4 ; Hu, Zhao 1 ; Yan, Ximing 4 ;

作者机构： 1.Guizhou Univ, Key Lab Green Pesticide & Agr Bioengn, State Key Lab Breeding Base Green Pesticide & Agr, State Local Joint Lab Comprehensive Utilizati B, Guiyang 550025, Guizhou, Peoples R China

2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China

3.Cent South Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Micro Nano Mat Interface Sci, Changsha 410083, Hunan, Peoples R China

4.Beibu Gulf Univ, Guangxi Key Lab Green Chem Mat & Safety Technol, Qinzhou 535011, Peoples R China

5.Guizhou Acad Agr Sci, Inst Anim Husb & Vet Med, Guiyang 550005, Peoples R China

期刊名称：NEW JOURNAL OF CHEMISTRY （ 影响因子：3.925； 五年影响因子：3.629 ）

ISSN： 1144-0546

年卷期：

页码：

收录情况： SCI

摘要： The application of electron-accumulation sites in the photocatalytic splitting of water for the hydrogen-production process represents a prospective strategy for the efficient use of solar energy. Herein, electron-accumulation sites (Ti-Mn-O-3) anchored on TiO2 hollow spheres (THS) were facilely prepared by a two-step calcination method involving the modification of Mn species and surface oxygen vacancies (Ovs). The optimized photocatalyst (TM30) showed excellent activity for photocatalytic water splitting (lambda >= 420 nm). The Ti-Mn-O-3 sites that were constructed on the surface of THS owing to electron transfer from the Mn atom to the Ti atom and three O atoms around Ovs were rich in electrons under in situ visible-light-driven conditions and constituted electron-accumulation sites, which not only greatly regulated the surface potential and band gap to enhance the separation efficiency of photogenerated charge carriers and the visible-light-responsive capability of the compound, but also improved the dissociation for the adsorption of H2O to reduce Gibbs free energies for hydrogen adsorption as well. This study demonstrates a novel approach for the efficient use of solar energy to produce hydrogen toward water splitting.

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