Enhanced Photocatalytic Activity of Ultrathin Ba5Nb4O15 Two-Dimensional Nanosheets

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• 作者：Sangbaek Park ; Hee Jo Song ; Chan Woo Lee ; Sung Won Hwang ; In Sun Cho
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 7, 2015
• 年：2015
• 卷：7
• 期：39
• 页码：21860-21867
• 全文大小：506K
• ISSN：1944-8252

文摘

Anisotropic two-dimensional (2D) nanosheets of the layered perovskite, Ba₅Nb₄O₁₅, with thicknesses of 5鈥?0 nm and lateral sizes of 300鈥?200 nm, were synthesized by a hydrothermal route. The influences of the 2D morphology of the material on the crystal and electronic structures, light absorption properties, and photocatalytic activity were investigated. The ultrathin nanosheets showed much-enhanced photocatalytic activity compared to both thick nanosheets (鈭?0 nm) and micrometer-sized particles for the evolution of H₂ from water splitting under UV light illumination. This enhanced activity is predominantly attributed to the larger surface area, higher optical absorption, and charge separation ability of the 2D nanosheet, which results from the variation of the local crystal structure arising from the ultrathin morphology of the Ba₅Nb₄O₁₅.