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Polaron States as a Massive Electron-Transfer Pathway at Heterojunction Interface

  • Heng Zhu
    Heng Zhu
    Eco-Materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    More by Heng Zhu
  • Qimeng Yang
    Qimeng Yang
    Eco-Materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    More by Qimeng Yang
  • Depei Liu
    Depei Liu
    National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    More by Depei Liu
  • Duanduan Liu
    Duanduan Liu
    National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    More by Duanduan Liu
  • Weining Zhang
    Weining Zhang
    National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
  • Zijing Chu
    Zijing Chu
    Eco-Materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    More by Zijing Chu
  • Xiaoming Wang
    Xiaoming Wang
    State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, Jiangsu 210023, P.R. China
  • Shicheng Yan*
    Shicheng Yan
    Eco-Materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    *Email: [email protected]
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  • Zhaosheng Li
    Zhaosheng Li
    Eco-Materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    More by Zhaosheng Li
  • , and 
  • Zhigang Zou
    Zhigang Zou
    Eco-Materials and Renewable Energy Research Center (ERERC), Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P.R. China
    More by Zhigang Zou
Cite this: J. Phys. Chem. Lett. 2020, 11, 21, 9184–9194
Publication Date (Web):October 15, 2020
https://doi.org/10.1021/acs.jpclett.0c02291
Copyright © 2020 American Chemical Society
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Abstract

For heterojunction semiconductor photoelectrodes, efficient charge separation is localized in the junction-induced electric field region and charge transfer follows a band-to-band charge-transfer pathway. Here, we found that polaron states at the heterojunction interface have a function of storing and transferring electrons. As a successful demonstration, we verified that the polaron states (Ti3+OH) on TiO2 are not passivated when used to create a CdS/TiO2 heterojunction and function as an efficient pathway for massively capturing, storing, and transferring the electrons from conduction bands of both TiO2 and CdS, thus effectively enhancing the charge separation efficiency of the heterojunction photoanode. The electron throughput of polaron states remains a positive correlation with polaron state density. Interfacial electron transfer through the TiO2 surface polaron states has great potential application in the development of high-performance heterojunction devices based on TiO2.

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Cited By


This article is cited by 3 publications.

  1. Heng Zhu, Shuyu Xiao, Wenguang Tu, Shicheng Yan, Tingchao He, Xi Zhu, Yingfang Yao, Yong Zhou, Zhigang Zou. In Situ Determination of Polaron-Mediated Ultrafast Electron Trapping in Rutile TiO2 Nanorod Photoanodes. The Journal of Physical Chemistry Letters 2021, 12 (44) , 10815-10822. https://doi.org/10.1021/acs.jpclett.1c03113
  2. Heng Zhu, Qimeng Yang, Depei Liu, Yu Du, Shicheng Yan, Min Gu, Zhigang Zou. Direct Electrochemical Protonation of Metal Oxide Particles. Journal of the American Chemical Society 2021, 143 (24) , 9236-9243. https://doi.org/10.1021/jacs.1c04631
  3. Haruki Nagakawa, Morio Nagata. Elucidating the Factors Affecting Hydrogen Production Activity Using a CdS/TiO2 Type-II Composite Photocatalyst. ACS Omega 2021, 6 (6) , 4395-4400. https://doi.org/10.1021/acsomega.0c05749