Assembly and Photocarrier Dynamics of Heterostructured Nanocomposite Photoanodes from Multicomponent Colloidal Nanocrystals

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• 作者：Anna Loiudice ; Jason K. Cooper ; Lucas H. Hess ; Tracy M. Mattox ; Ian D. Sharp ; R. Buonsanti
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：7347-7354
• 全文大小：484K
• ISSN：1530-6992

文摘

Multicomponent oxides and their heterostructures are rapidly emerging as promising light absorbers to drive oxidative chemistry. To fully exploit their functionality, precise tuning of their composition and structure is crucial. Here, we report a novel solution-based route to nanostructured bismuth vanadate (BiVO₄) that facilitates the assembly of BiVO₄/metal oxide (TiO₂, WO₃, and Al₂O₃) nanocomposites in which the morphology of the metal oxide building blocks is finely tailored. The combination of transient absorption spectroscopy鈥攕panning from picoseconds to second time scales鈥攁nd photoelectrochemical measurements reveals that the achieved structural tunability is key to understanding and directing charge separation, transport, and efficiency in these complex oxide heterostructured films.