Journal
JOURNAL OF CATALYSIS
Volume 378, Issue -, Pages 331-340Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.09.007
Keywords
3D hollow sphere g-C3N4; Pd nanoparticles; Charge migration; Photocatalytic hydrogen evolution
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Funding
- National Natural Science Foundation of China [21878047, 21676056, 21978048, 51673040, 11804084]
- Six Talents Pinnacle Program of Jiangsu Province of China [JNHB-006]
- Qing Lan Project of Jiangsu Province [1107040167]
- Graduate student scientific research innovation program of Jiangsu Province [KYCX18_0132]
- Scientific Research Foundation of Graduate School of Southeast University [YBPY1880]
- Fundamental Research Funds for the Central Universities [22420191(40137)]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [1107047002]
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Herein, 3D hollow-sphere structure graphitic carbon nitride (g-C3N4) with large specific surface area and high porosity is synthesized through a mild, heat polymerization, template-free route. The as-prepared hollow-sphere structure can be used as a substrate material for uniformly dispersing Pd nanoparticles to enhance the absorption of visible light and expose more active sites. Pd nanoparticles as electron acceptor are implanted into g-C3N4, which increases the trapping capability of capturing transition electrons to gain more photogenerated carriers participating in surface reactions. Therefore, the estimated charge separation lifetime of Pd/SCN (10 h) investigated by transient absorption spectroscopy was 1.4 ns +/- 338.0 ps, which is only half of SCN. Benefiting from the unique structure and the excellent optical performance, the obtained Pd/SCN composites exhibited prominent photocatalytic hydrogen evolution performance under visible light irradiation. Especially, the photocatalytic hydrogen rate of Pd/SCN (10 h) reached 267.9 mu mol/h, almost 10 times higher than the Pd/2D g-C3N4. Simultaneously, a possible mechanism for photocatalytic H-2 reaction was proposed based on the characterization results. (C) 2019 Elsevier Inc. All rights reserved.
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