Abstract
Photocatalytic production of hydrogen peroxide (H2O2) has gained significant attention as a sustainable technique in recent years. In this work, 0D/2D In2O3/ZnIn2S4 (ZISIO) Z-type heterojunction was successfully constructed using a calcination - solvothermal process,and its chemical composition, optical properties and photocatalytic mechanism were investigated. The In2O3/ZnIn2S4 nanocomposite photocatalysts exhibited excellent catalytic activity. After 100 min of visible light irradiation, the best performing sample (ZISIO60) showed the highest hydrogen peroxide concentration of 982.61 μmol L−1 in the solution. The concentration exhibited a 3.44-fold and 44.22-fold increase in comparison to that of prepared In2O3 and ZnIn2S4, correspondingly. The active species capture experiment results and Electron Spin Resonance spectra demonstrated that photocatalytic hydrogen peroxide production pathway of the prepared heterojunctions was a two-step single-electron indirect oxygen reduction reaction. In conclusion, the reported In2O3/ZnIn2S4 heterojunctions exhibit considerable catalytic activity and provide a reliable strategy for photocatalytic hydrogen peroxide production via photocatalysis.
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