Journal
APPLIED SURFACE SCIENCE
Volume 515, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146039
Keywords
ZnCo2O4; g-C3N4; Bimetallic oxide-based photocatalyst; Photocatalytic H-2 production
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Funding
- National Natural Science Foundation of China [11974276, 21676213, 21476183]
- China Postdoctoral Science Foundation [2016M600809]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM2026]
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A novel p-n heterojunction ZnCo2O4/g-C3N4 was firstly prepared via an accessible two-step refluxing-calcination process for efficient photocatalytic H-2 production. The synergistic effect between ZnCo2O4 nanoparticles and g-C3N4 nanosheets to provide the plentiful active sites and the lower H-2-evolution overpotential. The obtained 10%-ZnCo2O4/g-C3N4 hybrid achieved the highest H-2 production rate of 1530 mu mol g(-1) h(-1), which was 10 folds of bare g-C3N4 under the UV-Visible light, and also higher than that of Co3O4/g-C3N4 and ZnO/g-C3N4. According to the transient photocurrent responses, photoluminescence spectra and electrochemical impedance spectroscopy, the enhanced activity was ascribed to the higher separation efficiency of photo-excited electrons and holes via a Z-scheme charge transfer mechanism, which was confirmed through the capture experiment of active species. Moreover, the recycling experiments indicated that the composite has good photo-stability. This work provides a way to prepare the bimetallic oxides-based photocatalysts for the applications of energy conversion.
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