ß-SnWO4 Photocatalyst with Controlled Morphological Transition of Cubes to Spikecubes
ß-SnWO4 Photocatalyst with Controlled Morphological Transition of Cubes to Spikecubes
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DOI：
10.1021/acscatal.5b02444
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发表时间：
2016-04-01
期刊：
影响因子：
12.9
通讯作者：
Feldmann, Claus
中科院分区：
文献类型：
--
作者：
Chen, Ying-Chu;Lin, Yan-Gu;Feldmann, Claus
首次通过多元醇介导的合成制备了具有分层多臂结构和整体六面体对称性的独特形态的 ss-SnWO4，称为尖峰立方体。研究了 ss-SnWO4 尖晶石的生长，并将其归因于热力学和动力学控制。在连续反应中，被 {100} 面包围的 ss-SnWO4 晶体立方体在第一个基于奥斯特瓦尔德熟化的步骤中生长。在立方体种子的面上形成多臂尖峰之后，尖峰立方体的动力学控制生长过程随之而来。这种生长过程与有关高度支化晶体的文献显着不同。形态修饰（即引入更多的表面反应位点）和结构改变（即将 p 区 Sn2+ 并入简单的氧化钨中以重构其能带结构）的协同效应导致 ss-SnWO4 尖晶石的光催化活性比基准 WO3 光催化剂高 150%。
A distinct morphology of ss-SnWO4 with hierarchically multiarmed architecture and overall hexahedral symmetry entitled as spikecube is fabricated for the first time via a polyol-mediated synthesis. The growth of the ss-SnWO4 spikecubes is investigated and attributed to thermodynamic and kinetic control. In a sequential reaction, crystalline cubes of ss-SnWO4 enclosed by {100} facets grow in a first Ostwald ripening-based step. A kinetically controlled growth process to spikecubes follows under formation of multiarmed spikes on the facets of the cubic seeds. Such a growth process differs significantly from the literature concerning highly branched crystals. The synergistic effect of morphological modification (i.e., introducing more surface reaction sites) and textural alteration (i.e., incorporation of the p-block Sn2+ into simple tungsten oxide to reframe its band structure) leads to an enhanced photocatalytic activity of the ss-SnWO4 spikecubes being 150% higher in comparison to benchmark WO3 photocatalysts.