Carbon Quantum Dot/Silver Nanoparticle/Polyoxometalate Composites as Photocatalysts for Overall Water Splitting in Visible Light

Authors

  • Dr. Juan Liu,

    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
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  • Hengchao Zhang,

    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
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  • Di Tang,

    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
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  • Xing Zhang,

    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
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  • Dr. Likai Yan,

    1. Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 (China)
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  • Yuzhi Han,

    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
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  • Dr. Hui Huang,

    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
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  • Prof. Dr. Yang Liu,

    Corresponding author
    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
    • Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices

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  • Prof. Dr. Zhenhui Kang

    Corresponding author
    1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices
    2. Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.199 Ren'ai Road Suzhou, Jiangsu, 215123 (China)
    • Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices

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Abstract

The design of photocatalysts for overall water splitting in visible light remains a huge challenge. Carbon quantum dots (CQDs)/Ag/Ag3PW12O40 nanocomposites have high photocatalytic activities for overall water splitting in visible light without electron acceptors or hole scavengers. In the present system, H2 evolution was performed on Ag particles. O2 evolution appears to be a result of the oxidation of H2O on the valence band of Ag3PW12O40, which is enhanced by promoted electron-transfer events at hybrid interfaces of the polyoxometalates and CQDs. The synergistic effects of CQDs, Ag, and Ag3PW12O40 enable the design of a water-splitting catalyst with a remarkably improved efficiency (with an active region of λ<650 nm; apparent quantum yield ≈4.9 % at 480 nm) and operational stability.

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