Chinese Journal of Catalysis ›› 2023, Vol. 53: 123-133.DOI: 10.1016/S1872-2067(23)64514-0

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1D/0D heterostructured ZnIn2S4@ZnO S-scheme photocatalysts for improved H2O2 preparation

You Wua, Yi Yanga, Miaoli Gua, Chuanbiao Bieb,*(), Haiyan Tanc, Bei Chenga,*(), Jingsan Xud,*()   

  1. aState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China
    bLaboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei, China
    cSchool of Chemistry and Environmental Engineering, Hubei University for Nationalities, Enshi 445000, Hubei, China
    dSchool of Chemistry and Physics & Centre for Materials Science, Queensland University of Technology, Queensland 4000, Brisbane, Australia
  • Received:2023-07-24 Accepted:2023-08-28 Online:2023-10-18 Published:2023-10-25
  • Contact: *E-mail: biechuanbiao@cug.edu.cn (C. Bie), chengbei2013@whut.edu.cn (B. Cheng), jingsan.xu@qut.edu.au (J. Xu).
  • Supported by:
    The National Key Research and Development Program of China(2022YFB3803600);The National Key Research and Development Program of China(2022YFE0115900);National Natural Science Foundation of China(22238009);National Natural Science Foundation of China(22261142666);National Natural Science Foundation of China(52073223);National Natural Science Foundation of China(22278324);National Natural Science Foundation of China(22262012);National Natural Science Foundation of China(51932007);National Natural Science Foundation of China(22202187);The Natural Science Foundation of Hubei Province of China(2022CFA001);The National Postdoctoral Program for Innovative Talents(BX2021275);The Project funded by China Postdoctoral Science Foundation(2022M712957)

Abstract:

Solar photocatalysis is a promising, green, and sustainable technique for the synthesis of H2O2. In this study, low-dimensional ZnO/ZnIn2S4 S-scheme heterojunction photocatalysts are fabricated using electrostatic spinning and chemical bath deposition methods for the efficient photocatalytic production of H2O2. ZnO nanofibers loaded with 20 wt% ZnIn2S4 exhibit a superior H2O2 production rate of 928 μmol g-1 h-1, which is more than four times higher than that seen in pristine hexagonal phase ZnO and ZnIn2S4. First-principles calculations and in-situ X-ray photoelectron spectroscopy reveal the charge separation and transfer mechanisms in the S-scheme heterojunction. The construction of the S-scheme heterojunction facilitates the spatial separation of charge carriers, and electrons and holes with higher redox abilities are retained. Photoelectrochemical and photoluminescence tests further show that the formation of an S-scheme heterojunction is beneficial for the separation of photoinduced charge carriers. Electrochemical tests and electron paramagnetic resonance measurements indicate that H2O2 production is primarily via a two-step single-electron O2 reduction path. This study provides a new approach for the construction of S-scheme heterojunction materials that can efficiently produce H2O2 under solar irradiation.

Key words: S-scheme heterojunction, Hydrogen peroxide production, Low-dimensional heterostructure, In-situ spectroscopy, Nanofiber