β-SnWO4 Photocatalyst with Controlled Morphological Transition of Cubes to Spikecubes

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• 作者：Ying-Chu Chen ; Yan-Gu Lin ; Liang-Ching Hsu ; Alexander Tarasov ; Po-Tuan Chen ; Michitoshi Hayashi ; Jan Ungelenk ; Yu-Kuei Hsu ; Claus Feldmann
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：April 1, 2016
• 年：2016
• 卷：6
• 期：4
• 页码：2357-2367
• 全文大小：659K
• ISSN：2155-5435

文摘

A distinct morphology of β-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 β-SnWO₄ spikecubes is investigated and attributed to thermodynamic and kinetic control. In a sequential reaction, crystalline cubes of β-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 β-SnWO₄ spikecubes being 150% higher in comparison to benchmark WO₃ photocatalysts.