Ternary ZnS/ZnO/Graphitic Carbon Nitride Heterojunction for Photocatalytic Hydrogen Production
Bolatov A. Manjovelo A. Chouchene B. Balan L. Gries T. Medjahdi G. Uralbekov B. Schneider R.
October 2024Multidisciplinary Digital Publishing Institute (MDPI)
Materials
2024#17Issue 19
Ternary ZnS/ZnO/graphitic carbon nitride (gCN) photocatalysts were prepared by coupling gCN sheets with ZnO nanorods under solvothermal conditions followed by sulfurization using Na2S. SEM and TEM analyses show that small-sized ZnS particles (ca. 7.2 nm) deposit homogeneously on the surface of ZnO/gCN nanohybrids. Photoluminescence and electrochemical impedance spectroscopy show that ZnS allows for an enhanced charge separation efficiency as well as prolonged lifetime of photogenerated charge carriers, leading to improved hydrogen photoproduction under UV light irradiation compared to ZnO/gCN. Moreover, the deposition of ZnS nanoparticles improves the photostability of the ZnS/ZnO/gCN catalyst for hydrogen production. A double Z-scheme mechanism is proposed for hydrogen photoproduction using the ZnS/ZnO/gCN heterojunction.
double Z-scheme mechanism , photocatalytic hydrogen evolution , ZnS/ZnO/gCN heterojunction
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LRGP, CNRS, Université de Lorraine, Nancy, F-54000, France
Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Al-Farabi Av., 71, Almaty, 050040, Kazakhstan
CEMHTI-UPR 3079 CNRS, Site Haute Température, 1D Avenue de la Recherche Scientifique, Orléans, F-45071, France
IJL, CNRS, Université de Lorraine, Nancy, F-54000, France
LRGP
Center of Physical-Chemical Methods of Research and Analysis
CEMHTI-UPR 3079 CNRS
IJL
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