Synthesis of High-Quality Brookite TiO2 Single-Crystalline Nanosheets with Specific Facets Exposed: Tuning Catalysts from Inert to Highly Reactive
Synthesis of High-Quality Brookite TiO2 Single-Crystalline Nanosheets with Specific Facets Exposed: Tuning Catalysts from Inert to Highly Reactive
复制标题
具有特定晶面暴露的高质量板钛矿 TiO2 单晶纳米片的合成：将催化剂从惰性调整为高反应性
DOI：
10.1021/ja3014049
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发表时间：
2012-05-23
影响因子：
15
通讯作者：
Yu, Richeng
中科院分区：
文献类型：
--
作者：
Lin, Haifeng;Li, Liping;Yu, Richeng
与常见的锐钛矿和金红石相相比，钛矿相的制备和研究较少。此外，对这种材料的光致活性的认知存在着巨大的争议。本文首次采用一种新颖的低碱度溶液化学方法，制备了由四个{210}、两个{101}和两个{201}切面包围的高质量硼钛石TiO2单晶纳米片。这些纳米片对有机污染物的催化降解表现出优异的活性，甚至优于德固赛P25，这是由于暴露在高能切面中，并且这些切面作为氧化和还原位点有效地抑制了光生电子和空穴的重组速率。相反，不规则刻面相纯brookite纳米花和纳米纺锤体在催化反应中无活性。这些结果表明，brookite TiO2的光催化活性高度依赖于其暴露的表面，这为通过调整催化剂的形态和表面结构来调整催化剂从惰性到高活性提供了一种策略。
The brookite phase of TiO2 is hardly prepared and rarely studied in comparison with the common anatase and rutile phases. In addition, there exist immense controversies over the cognition of the light-induced liveliness of this material. Here, a novel, low-basicity solution chemistry method was first used to prepare homogeneous high-quality broolcite TiO2 single-crystalline nanosheets surrounded with four {210}, two {101}, and two {201} facets. These nanosheets exhibited outstanding activity toward the catalytic degradation of organic contaminants superior even to that of Degussa P25, due to the exposure of high-energy facets and the effective suppression of recombination rates of photo-generated electrons and holes by these facets as the oxidative and reductive sites. In contrast, irregularly faceted phase-pure brookite nanoflowers and nanospindles were inactive in catalytic reactions. These results demonstrate that the photocatalytic activity of brookite TiO2 is highly dependent upon its exposed facets, which offers a strategy for tuning the catalysts from inert to highly active through tailoring of the morphology and surface structure.