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Small Change, Big Difference: Photoelectrochemical Behavior of Au Nanocluster-Sensitized TiO2 Altered by Core Restructuring

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    Small Change, Big Difference: Photoelectrochemical Behavior of Au Nanocluster-Sensitized TiO2 Altered by Core Restructuring
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    • Junghyun Lee
      Junghyun Lee
      Department of Bionano Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
      More by Junghyun Lee
    • Malenahalli H. Naveen
      Malenahalli H. Naveen
      Nanosensor Research Institute, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
      More by Malenahalli H. Naveen
      Orcidhttps://orcid.org/0000-0003-2632-6749
    • Jein Park
      Jein Park
      Department of Chemistry, Duksung Women’s University, Seoul 01369, Republic of Korea
      More by Jein Park
    • Kyunglim Pyo
      Kyunglim Pyo
      Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
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    • Hahkjoon Kim*
      Hahkjoon Kim
      Department of Chemistry, Duksung Women’s University, Seoul 01369, Republic of Korea
      *Email: [email protected] (H.K.)
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    • Dongil Lee*
      Dongil Lee
      Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
      *Email: [email protected] (D.L.)
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      Orcidhttps://orcid.org/0000-0001-7254-1197
    • Jin Ho Bang*
      Jin Ho Bang
      Nanosensor Research Institute, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
      Department of Chemical and Molecular Engineering and Department of Applied Chemistry, Center for Bionano Intelligence Education and Research, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
      *Email: [email protected] (J.H.B.)
      More by Jin Ho Bang
      Orcidhttps://orcid.org/0000-0002-6717-3454
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    ACS Energy Letters

    Cite this: ACS Energy Lett. 2021, 6, 6, 2305–2312
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    https://doi.org/10.1021/acsenergylett.1c00990
    Published May 28, 2021
    Copyright © 2021 American Chemical Society
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    Abstract

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    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 Au25 NC as a model system, we delicately tailored the icosahedral Au13 core of Au25 NC into a cuboctahedral Au15 core of Au23 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.

    Copyright © 2021 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsenergylett.1c00990.

    • Experimental details and additional characterization results: Au NCs synthesis and purification, preparation of photoanodes and solar cells, and characterization techniques; UV–vis absorption spectra of solutions and films, ESI-MS data as well as UPS, XPS, and IPCE spectra; Nyquist plots, the equivalent circuit employed for fitting EIS data, VOC decay curves, electron lifetime of MCSSCs, and stability tests under continuous illumination (PDF)

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    This article is cited by 17 publications.

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    ACS Energy Letters

    Cite this: ACS Energy Lett. 2021, 6, 6, 2305–2312
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsenergylett.1c00990
    Published May 28, 2021
    Copyright © 2021 American Chemical Society
    Request reuse permissions

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