Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 10, Pages 13488-13499Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.01.207
Keywords
Photocatalytic H-2 evolution; S-scheme; Cd0.5Zn0.5Se-diethylenetriamine; Porous g-C3N4; Ni2P
Categories
Funding
- National Natural Science Foundation of China [51572103, 51973078]
- Distinguished Young Scholar of Anhui Province [1808085J14]
- Major projects of Education Department of Anhui Province [KJ2020ZD005]
- Anhui Provincial Teaching Team [2019jxtd062]
- Key Foundation of Educational Commission of Anhui Province [KJ2019A0595]
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The synthesis of the ternary Ni2P/pg-C3N4/Cd0.5Zn0.5Se-D composite has significantly improved the photocatalytic H-2 evolution rate, while also revealing the mechanism of photocarrier migration in the novel Ni2P modified S-scheme structure.
Inadequate photogenerated carrier' separation is deemed to be the major obstacles for improving photocatalytic H-2 evolution. Here, we designed distinctive Ni2P/porous g-C3N4/Cd0.5Zn0.5Se-diethylenetriamine (Ni2P/pgC(3)N(4)/Cd0.5Zn0.5Se-D) nanojunction via an in-situ solvothermal synthesis. The cooperative effect of Cd0.5Zn0.5SeD and Ni2P can extend the visible light absorption for pg-C3N4. As a result, the ternary Ni2P/pg-C3N4/ Cd0.5Zn0.5Se-D composite exhibits high-performance H-2 evolution rate of 12627 mu mol g(-1) h(-1) using solar light, being almost 105.23 and 2.59 folds higher than those observed over Ni2P/pg-C3N4 and pg-C3N4/Cd0.5Zn0.5Se-D composite, severally. The possible mechanism is assumed that the formation of the novel Ni2P modified stepscheme (S-scheme) pg-C3N4/Cd0.5Zn0.5Se-D heterojunction which manipulated highly efficient spatial separation and directional migration of photocarriers. Moreover, DFT calculations have been performed to uncover the process of the charge transport. This work concentrates on the profound part of noble-metal-free decorated Sscheme photocatalytic system in water splitting.
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