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

第一作者： Zhang, Yujiao

作者： Zhang, Yujiao;Hu, Zhao;Zhang, Yujiao;Zhao, Dan;Wang, Yan;Wang, Baoyu;Liang, Xingtang;Yin, Yanzhen;Yan, Ximing;Pu, Ling

作者机构：

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

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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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