Band Gap Tailored Zn(Nb1−xVx)2O6 Solid Solutions as Visible Light Photocatalysts

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• 作者：Sang Min Ji ; Sun Hee Choi ; Jum Suk Jang ; Eun Sun Kim ; Jae Sung Lee
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：October 15, 2009
• 年：2009
• 卷：113
• 期：41
• 页码：17824-17830
• 全文大小：437K
• 年卷期：v.113,no.41(October 15, 2009)
• ISSN：1932-7455

文摘

Zn(Nb_1−xV_x)₂O₆ solid solutions (0.01 ≤ x ≤ 0.1) were synthesized by incorporation of V into the lattice of ZnNb₂O₆ by solid-state reaction. The wide-band-gap semiconductor ZnNb₂O₆ (3.98 eV) became visible-light-active with the band gap energy shifted down to ca. 2.5 eV. Physical characterization with XRD, XPS, and XANES revealed that homogeneous solid solutions were synthesized, which showed systematic variation of electronic structure with concentration of incorporated vanadium. Theoretical band structure calculation indicated that d orbitals of vanadium were responsible for the band gap reduction by forming the bottom part of the conduction band of the solid solution. All V-incorporated solid solutions loaded with RuO₂ as a co-catalyst showed photocatalytic activities for H₂ or O₂ production from aqueous solutions of sacrificial reagents under visible light irradiation (λ ≥ 420 nm) and RuO₂(3 wt %)-loaded Zn(Nb_0.94V_0.06)₂O₆ showed the highest activity.