Oxygen vacancies confined in SnO 2 nanoparticles for desirable electronic structure and enhanced visible light photocatalytic activity

Yuanjie Yang, Yuhua Wang, Shu Yin

    研究成果: Article査読

    102 被引用数 (Scopus)

    抄録

    Electronic structure in principle determines the light absorbance, charge transfer and separation, and consequently, photocatalytic property of a photocatalyst. Herein, we report rutile SnO 2 with a desirable electronic structure that exhibits a narrowed bandgap and an increased valence band width resulted from the introduction of homogeneous oxygen vacancies. XPS, Raman, ESR and PL spectra demonstrate the homogeneous oxygen vacancies confined in SnO 2 nanoparticles. Moreover, the first principle calculations theoretically reveal the desirable electronic structure. The narrowed bandgap further contributes to extended light absorption range and the increased valence band width leads to efficient charge transfer and separation, hence facilitating the visible light photoreactivity. As a result, the defected SnO 2 exhibits a superior visible light photocatalytic activity. More strikingly, the photodegration of methyl orange (MO) is completely accomplished within only 20 min under λ ≥ 420 nm. Briefly, this work both experimentally and theoretically indicates that homogeneous oxygen vacancies confined in SnO 2 nanoparticles lead to the optimized electronic structure and, consequently, the remarkable visible light photocatalytic activity. This could open up an innovative strategy for designing potentially efficient photocatalysts.

    本文言語English
    ページ(範囲)399-406
    ページ数8
    ジャーナルApplied Surface Science
    420
    DOI
    出版ステータスPublished - 2017 10月 31

    ASJC Scopus subject areas

    • 化学 (全般)
    • 凝縮系物理学
    • 物理学および天文学(全般)
    • 表面および界面
    • 表面、皮膜および薄膜

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