Small Change, Big Difference: Photoelectrochemical Behavior of Au Nanocluster-Sensitized TiO2 Altered by Core Restructuring
- Authors
- Lee, Junghyun; Naveen, Malenahalli H.; Park, Jein; Pyo, Kyunglim; Kim, Hahkjoon; Lee, Dongil; Bang, Jin Ho
- Issue Date
- Jun-2021
- Publisher
- American Chemical Society
- Citation
- ACS Energy Letters, v.6, no.6, pp 2305 - 2312
- Pages
- 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Energy Letters
- Volume
- 6
- Number
- 6
- Start Page
- 2305
- End Page
- 2312
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/105729
- DOI
- 10.1021/acsenergylett.1c00990
- ISSN
- 2380-8195
- Abstract
- Ultrasmall gold nanoclusters (Au NCs) have recently gained enormous popularity as a newly emerging light harvester, but many fundamental aspects of their photoelectrochemical behavior are still largely unknown. Unlike traditional photoactive nanoparticles, the NC's core structure, rather than its size, is a key factor that dictates the physical properties of NCs because of a strong quantum confinement effect. Despite this importance, no effort has been made to elucidate the effect of the core structure on the photoelectrochemistry of Au NC-sensitized TiO2 (Au NC-TiO2). Using Au-25 NC as a model system, we delicately tailored the icosahedral Au-15 core of Au-25 NC into a cuboctahedral Au is core of Au-23 NC. This subtle core manipulation has a drastic impact on the entire interfacial behavior of Au NC-TiO2, which in turn significantly affects the photoelectrochemical performance. This new insight highlights the overlooked effect of the core structure on the photoelectrochemistry of Au NC-TiO2.
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