不同结构钽酸钠的制备及其光解水析氢性能

doi:10.1016/S1872-2067(10)60286-0

催化学报 ›› 2011, Vol. 32 ›› Issue (12): 1822-1830.DOI: 10.1016/S1872-2067(10)60286-0

不同结构钽酸钠的制备及其光解水析氢性能

黄浪欢*, 产启中, 张斌, 吴晓婧, 高鹏, 焦自斌, 刘应亮

暨南大学化学系, 广东广州 510632

收稿日期:2011-07-29 修回日期:2011-09-13 出版日期:2011-12-21 发布日期:2015-04-23

Preparation of Sodium Tantalate with Different Structures and Its Photocatalytic Activity for H₂ Evolution from Water Splitting

HUANG Langhuan*, CHAN Qizhong, ZHANG Bin, WU Xiaojing, GAO Peng, JIAO Zibin, LIU Yingliang

Department of Chemistry, Jinan University, Guangzhou 510632, Guangdong, China

Received:2011-07-29 Revised:2011-09-13 Online:2011-12-21 Published:2015-04-23

摘要/Abstract

摘要： 采用不同钠源, 在水热条件下实现了钙钛矿结构 NaTaO₃、烧绿石结构 Na₂Ta₂O₆ 以及 NaTaO₃/Na₂Ta₂O₆ 异质结型复合光催化剂的可控合成, 利用 X 射线衍射、扫描电镜、高分辨透射电镜、紫外-可见漫反射光谱、荧光光谱和 X 射线光电子能谱对样品进行了表征, 探讨了钠源对所得钽酸钠样品结构的影响. 光解水析氢实验结果表明, 各钽酸盐的光催化活性顺序为 NaTaO₃/Na₂Ta₂O₆ > NaTaO₃ > Na₂Ta₂O₆ . NaTaO₃与 Na₂Ta₂O₆ 间形成的纳米尺度异质结有效抑制了光生电子和空穴的复合, 这是其具有最高光解水析氢活性的主要原因.

关键词: 光催化, 光解水, 钽酸钠, 异质结, 水热合成法

Abstract: Sodium tantalate photocatalysts with a perovskite structure (NaTaO₃), a pyrochlore structure (Na₂Ta₂O₆), and a nano-heterojunction (NaTaO₃/Na₂Ta₂O₆) structure were controllably synthesized using the hydrothermal method. Sodium carbonate, sodium stearate, and sodium acetate were used as precursors, respectively. The physical properties of the as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, ultraviolet visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The effects of the sodium precursor on the structure of sodium tantalate are discussed. The photocatalytic results indicated that the activity for the H₂ evolution half-reaction from water splitting was in the following order: NaTaO₃/Na₂Ta₂O₆ > NaTaO₃ > Na₂Ta₂O₆. The highest photocatalytic activity of NaTaO₃/Na₂Ta₂O₆ can be attributed to heterojunction formation within the nanoparticles, which significantly enhanced the separation of the electron-hole pairs.

Key words: photocatalysis, photocatalytic water splitting, sodium tantalate, heterojunction, hydrothermal synthesis

黄浪欢, 产启中, 张斌, 吴晓婧, 高鹏, 焦自斌, 刘应亮. 不同结构钽酸钠的制备及其光解水析氢性能[J]. 催化学报, 2011, 32(12): 1822-1830.

HUANG Lang-Huan, CHAN Qi-Zhong, ZHANG Bin, WU Xiao-Jing, GAO Peng, JIAO Zi-Bin, LIU Ying-Liang. Preparation of Sodium Tantalate with Different Structures and Its Photocatalytic Activity for H₂ Evolution from Water Splitting[J]. Chinese Journal of Catalysis, 2011, 32(12): 1822-1830.

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不同结构钽酸钠的制备及其光解水析氢性能

Preparation of Sodium Tantalate with Different Structures and Its Photocatalytic Activity for H₂ Evolution from Water Splitting

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