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在可见光照射下,BiVO4 薄片上水氧化反应对晶面的依赖性。

Crystal facet dependence of water oxidation on BiVO4 sheets under visible light irradiation.

机构信息

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, P.R. China.

出版信息

Chemistry. 2011 Jan 24;17(4):1275-82. doi: 10.1002/chem.201001636. Epub 2010 Nov 29.

Abstract

Monoclinic BiVO(4) crystals with preferentially exposed (040) facets were hydrothermally synthesized by using a trace amount of TiCl(3) as the directing agent; this function was confirmed by X-ray diffraction patterns (XRD) and high-resolution transmission electron microscopy (HRTEM). The effects of the directing agent TiCl(3) and the pH values applied during synthesis have been studied, and the optimized BiVO(4) sample with highly exposed (040) facet could be obtained by using 1.2 at.% of TiCl(3) as the directing agent at a pH value of 2. Some complementary techniques were also applied to exclude the effects of the structural and physical property changes, such as surface area and hydrophilicity. The photocatalytic activity of oxygen evolution on BiVO(4) is found to be proportionally correlated with the exposed surfaces of the (040) facet. It is assumed that the active sites with a BiV(4) structure on the exposed (040) facet is assigned to be responsible for the high activity of O(2) evolution.

摘要

使用痕量的 TiCl3 作为导向剂,通过水热法合成了具有优先暴露(040)面的单斜 BiVO4 晶体;这一功能通过 X 射线衍射图谱(XRD)和高分辨率透射电子显微镜(HRTEM)得到了确认。研究了导向剂 TiCl3 和合成过程中应用的 pH 值的影响,通过使用 1.2at.%的 TiCl3 作为导向剂,并将 pH 值调至 2,可获得高度暴露(040)面的优化 BiVO4 样品。还应用了一些补充技术来排除结构和物理性质变化(如表面积和亲水性)的影响。发现 BiVO4 上的析氧光催化活性与(040)面的暴露表面成比例相关。据推测,暴露的(040)面上具有 BiV4 结构的活性位点负责 O2 演化的高活性。

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