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Photoelectrochemistry of Au Nanocluster-Sensitized TiO2: Intricacy Arising from the Light-Induced Transformation of Nanoclusters into Nanoparticles
ACS Energy Letters ( IF 22.0 ) Pub Date : 2020-11-23 , DOI: 10.1021/acsenergylett.0c02306
Rizwan Khan 1 , Malenahalli H. Naveen 2 , Muhammad A. Abbas 2 , Junghyun Lee 1 , Hahkjoon Kim 3 , Jin Ho Bang 2, 4, 5
Affiliation  

Investigating photoelectrode interfaces is challenging due to complex charge carrier pathways, and photodegradation aggravates this difficulty because interfacial properties are significantly altered by degradation. Unlike dyes and semiconductors that degrade into photoinactive materials, the photodegradation of Au nanoclusters (NCs) yields Au nanoparticles (NPs) that are photoactive. Besides, these NPs can form Schottky barriers with TiO2, which can affect interfacial band structures. Hence, the copresence of this photoactive nanoduo gives rise to unprecedented complexity in understanding the photoelectrochemical behavior of NC-sensitized photoelectrodes. In this work, we unveil that electron injection into TiO2 and subsequent electron trapping at deep surface trap states in TiO2, which are created by sensitization, play a vital role in the photodegradation. We also demonstrate that photocurrent can be enhanced through judicious control over photodegradation that would otherwise be deleterious. This photocurrent enhancement is attributed to multiple overlooked effects of Au NPs (plasmonic field enhancement and interfacial band bending).

中文翻译:

Au纳米团簇敏感的TiO 2的光电化学:纳米团簇向纳米粒子的光诱导转变引起的复杂性。

由于复杂的电荷载流子途径,研究光电极界面是具有挑战性的,并且光降解加剧了这一困难,因为界面性质会因降解而大大改变。与降解成光惰性材料的染料和半导体不同,金纳米团簇(NC)的光降解产生具有光活性的金纳米颗粒(NP)。此外,这些纳米粒子还可以与TiO 2形成肖特基势垒,从而影响界面能带结构。因此,这种光敏纳米二元的共存在理解NC敏化光电极的光电化学行为方面引起了前所未有的复杂性。在这项工作中,我们揭示了向TiO 2中注入电子以及随后在TiO中深表面陷阱状态的电子陷阱2,由致敏产生,起到降解至关重要的作用。我们还证明,通过明智地控制光降解可以增强光电流,否则会造成有害的影响。这种光电流增强归因于金纳米颗粒的多个被忽略的效应(等离子体场增强和界面能带弯曲)。
更新日期:2021-01-08
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