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首页> 外文期刊>Catalysts >Mechanistic Study on Facet-Dependent Deposition of Metal Nanoparticles on Decahedral-Shaped Anatase Titania Photocatalyst Particles
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Mechanistic Study on Facet-Dependent Deposition of Metal Nanoparticles on Decahedral-Shaped Anatase Titania Photocatalyst Particles

机译：十面体形锐钛矿型二氧化钛光催化剂上金属纳米面的面沉积机理研究

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摘要

Facet-selective gold or platinum-nanoparticle deposition on decahedral-shaped anatase titania particles (DAPs) exposing {001} and {101} facets via photodeposition (PD) from metal-complex sources was reexamined using DAPs prepared with gas-phase reaction of titanium (IV) chloride and oxygen by quantitatively evaluating the area deposition density on {001} and {101} and comparing with the results of deposition from colloidal metal particles in the dark (CDD) or under photoirradiation (CDL). The observed facet selectivity, more or less {101} preferable, depended mainly on pH of the reaction suspensions and was almost non-selective at low pH regardless of the deposition method, PD or CDL, and the metal-source materials. Based on the results, the present authors propose that facet selectivity is attributable to surface charges (zeta potential) depending on the kind of facets, {001} and {101}, and pH of the reaction mixture and that this concept can explain the observed facet selectivity and possibly the reported facet selectivity without taking into account facet-selective reaction of photoexcited electrons and positive holes on {101} and {001} facets, respectively.
机译：使用通过钛气相反应制备的DAP重新检查通过光沉积（PD）从金属复杂源暴露出{001}和{101}小面的十面体形锐钛矿型二氧化钛颗粒（DAP）上的小面选择性金或铂纳米颗粒沉积（IV）通过定量评估{001}和{101}上的面积沉积密度，并与在黑暗（CDD）或在光辐照（CDL）下从胶态金属颗粒沉积的结果进行比较，得出氯化物和氧气。观察到的小面选择性或多或少是{101}优选的，主要取决于反应悬浮液的pH，并且在低pH下几乎无选择性，而与沉积方法，PD或CDL以及金属源材料无关。基于这些结果，本发明人提出，取决于刻面的种类{001}和{101}以及反应混合物的pH，刻面选择性可归因于表面电荷（ζ电势），并且该概念可以解释所观察到的现象。刻面选择性以及可能报道的刻面选择性，而未分别考虑{101}和{001}刻面上的光激发电子和空穴的刻面选择性反应。

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