Visible-Light-Responsive Chalcogenide Photocatalyst Ba2ZnSe3: Crystal and Electronic Structure, Thermal, Optical, and Photocatalytic Activity

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• 作者：Molin Zhou ; Ke Xiao ; Xingxing Jiang ; Hongwei Huang ; Zheshuai Lin ; Jiyong YaoYicheng Wu
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：December 19, 2016
• 年：2016
• 卷：55
• 期：24
• 页码：12783-12790
• 全文大小：471K
• ISSN：1520-510X

文摘

Visible-light-responsive photocatalytic materials have important applications. In this article, through inserting electropositive ion Ba²⁺ into the three-dimensional framework of ZnSe, a one-dimensional chalcogenide Ba₂ZnSe₃ has been obtained by traditional solid-state reaction. It crystallizes in orthorhombic centrosymmetric space group Pnma with unit cell parameters of a = 9.0744(2) Å, b = 4.4229(1) Å, c = 17.6308(4) Å, and Z = 4. Its structure features [ZnSe₃]^4– anionic straight chains parallel to the b direction, which are further separated by Ba²⁺ cations filling in the cavities. On the basis of the UV–vis–NIR diffuse reflectance spectroscopy, Ba₂ZnSe₃ possesses a typical direct band gap of 2.75 eV, which is in good agreement with the electronic structure calculation. Moreover, Ba₂ZnSe₃ shows good visible-light-responsive photocatalytic activity and excellent thermal stability and cyclability, which are favorable for its application.