In_1-xGa_xBO₃ (0 ≤ x ≤ 0.5) - Solvothermal Synthesis, Morphology, and Performance in Photocatalytic Water Reduction

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• 作者：Yao Yang ; Kai Song ; Mufei Yue ; Liangju Li ; Rihong Cong ; Wenliang Gao and Tao Yang
• 刊名：European Journal of Inorganic Chemistry
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：2017
• 期：1
• 页码：63-68
• 全文大小：2750K
• ISSN：1099-0682c

文摘

Partial solid solutions of In_1–xGa_xBO₃ (0 ≤ x ≤ 0.5) were synthesized by the solvothermal method, and they were characterized by powder X-ray diffraction, scanning and transmission electron microscopy, UV/Vis absorption spectroscopy, and N₂ adsorption–desorption, in order to identify the phase purity and micromorphology. Nanocrystallites of InBO₃ exhibit a particular anisotropic growth along the [110] direction, forming spindlelike morphology (with a diameter of ca. 20 nm and a length of ca. 200 nm). These nanocrystallites further aggregate into microspheres. With Ga³⁺ substitution, the anisotropic growth was depressed; the nanocrystallites thus exhibited a typical rodlike morphology. Metal borates are well-known optical materials; however, their photocatalytic properties have been rarely studied. Here, post-annealing under O₂ flow at 350 °C improved the photocatalytic H₂ evolution rate of InBO₃ from 18.2(6) to 29.5(8) µmol h^–1 g^–1. A loading of Pt, RuO_x, or NiO_x as cocatalyst resulted in further enhancement of the H₂ evolution rate, with an optimal value of 56.1(5) µmol h^–1 g^–1 under UV light.