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A single atom photocatalyst co-doped with potassium and gallium for enhancing photocatalytic hydrogen peroxide synthesis

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Abstract

Polymer carbon nitride (PCN) is widely used in photocatalysis. However, pristine PCN has disadvantages such as insufficient visible light absorption and low photogenerated carrier separation efficiency that greatly limited the photocatalytic efficiency. As a non-toxic metal, gallium has the potential to solve the defects of PCN. Gallium ions coordinated with nitrogen in carbon nitride to form Ga-N active sites and improved the photocatalytic activity. The doped potassium ions form a transmission channel for charge redistribution and transfer between adjacent layers, which is beneficial for better separation of photoexcited carriers. In this study, a series of PCN co-doped with gallium and potassium (Ga-K-PCN) were prepared. The experimental results indicated photocatalytic generation of hydrogen peroxide proceeds through the 2e- oxygen reduction reaction pathway. Notably, Nyquist plots and photocurrent results further proved that the presence of Ga-N sites and potassium ion do** could significantly improve the separation/transfer of intra-planar and interlayer charge carriers and thus enhance photocatalytic efficiency. The Ga10-K3-PCN photocatalysts promoted yield of H2O2, with reactivity at 28.2 μmol/(g·h) and solar-to-chemical conversion efficiency at 0.64%, surpassed that of a typical photo-catalyst based on PCN (0.18%).

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Acknowledgements

The support of Mitsubishi Chemical Corporation and the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research B (No. 20H02847), the Support for Pioneering Research Initiated by the Next Generation program for Japan Science and Technology Agency (No. JPMJSP2154), and the National Natural Science Foundation of China (No. 52103008) are greatly acknowledged.

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  1. Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu, 804-8550, Japan

    Wenan Cai, Yuichiro Tanaka & Teruhisa Ohno

  2. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, **’an, 710021, China

    **ng Zhu

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  1. Wenan Cai
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  2. Yuichiro Tanaka
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  4. Teruhisa Ohno
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Correspondence to **ng Zhu or Teruhisa Ohno.

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A single atom photocatalyst co-doped with potassium and gallium for enhancing photocatalytic hydrogen peroxide synthesis

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Cai, W., Tanaka, Y., Zhu, X. et al. A single atom photocatalyst co-doped with potassium and gallium for enhancing photocatalytic hydrogen peroxide synthesis. Nano Res. (2024). https://doi.org/10.1007/s12274-024-6736-9

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