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首页> 外文期刊>Chemistry: A European journal >Visible-Light Sensitization and Photoenergy Storage in Quantum Dot/Polyoxometalate Systems
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Visible-Light Sensitization and Photoenergy Storage in Quantum Dot/Polyoxometalate Systems

机译：量子点/多金属氧酸盐系统中的可见光敏化和光能存储

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摘要

Recently, the process by which energy is transferred from photoexcited semiconductor nanocrystals, called quantum dots (QDs), to other semiconductors has attracted much attention and has potential application in solar energy conversion (i.e., QD-sensitized solar cells). Sensitization of wide band gap polyoxometalates (POMs) to visible light by using CuInS2 QDs dispersed in an organic solution is demonstrated herein. Photoluminescence quenching and lifetime studies revealed efficient electron transfer from the CuInS2 QDs to POMs, such as SiW12O40 and W10O32, that were hybridized with a cationic surfactant. CuInS2 QDs function as an antenna that absorbs visible light and supplies electrons to the POMs to enable certain photocatalytic reactions, including noble-metal-ion reduction. The photoenergy storage capabilities of the QD-POM system, in which electrons photogenerated in QDs by visible-light excitation are trapped and accommodated by POMs to form reduced POM, are also demonstrated. Electrons stored in the POM can be later discharged through reductive reactions, such as oxygen reduction, in the dark.
机译：近来，能量从被光激发的半导体纳米晶体（称为量子点（QD））转移到其他半导体的过程引起了很多关注，并且在太阳能转换（即，QD敏感的太阳能电池）中具有潜在的应用。本文展示了通过使用分散在有机溶液中的CuInS2 QD将宽带隙多金属氧酸盐（POM）敏化为可见光。光致发光猝灭和寿命研究表明，有效的电子从CuInS2 QD转移到了与阳离子表面活性剂杂交的POM，如SiW12O40和W10O32。 CuInS2 QD用作吸收可见光并将电子提供给POM的天线，以实现某些光催化反应，包括还原贵金属离子。还展示了QD-POM系统的光能存储能力，其中QD中通过可见光激发产生的电子被POM捕获并容纳，从而形成还原的POM。储存在POM中的电子随后可以在黑暗中通过还原反应（例如氧气还原）释放。

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