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

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

Abstract

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

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

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