Journal
CHEMICAL ENGINEERING JOURNAL
Volume 393, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124681
Keywords
p-n junction; Core-shell heterojunction; Cocatalyst; Bulk charge separation; Surface reaction kinetics
Categories
Funding
- National Natural Science Foundation of China [21001024, 21471031]
- Natural Science Foundation of Jiangsu Province [BK2011587, BK20131289]
- Teaching and Research Program for the Excellent Young Teachers of Southeast University [2242015R30026]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Spontaneously photocatalytic water splitting to generate H-2 and O-2 represents a promising strategy for converting solar energy to chemical energy. However, photocatalytic water splitting without sacrificial agents is difficult due to the poor bulk charge separation and retarded surface reaction kinetics. Herein, we first combined the p-type Co3O4 cocatalysts with n-type ZnO@ZnS core-shell heterojunction to create a Co3O4-decorated ZnO@ZnS p-n junction by using bimetallic ZnCo-MOFs as template. In this hybrid, both the heterojunction and p-n junction can accelerate the bulk charge separation, while the highly dispersed Co3O4 cocatalysts can enhance the surface reaction kinetics. As a result, the outstanding H-2 and O-2 production rates of 3853 and 1927 mu mol g(-1) h(-1) were obtained for the optimal sample, approximately 1750, 550 and 110 times higher than those of ZnO, ZnO@ZnS and ZnO/Co3O4. Such synergistic enhancement can be evidenced by charge separation efficiency calculation. XAFS, XPS and DFT calculation indicated that the electrons and holes can be effectively assembled on ZnO and Co3O4, respectively. This work provides a new strategy for combining the advantages of cocatalyst and p-n junction as well as the core-shell heterojunction to enhance the photocatalytic water splitting without sacrificial agent.
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