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Extended n-conjugated system in carbon nitride by incorporating pyridine rings and N vacancies for photocatalytic H2 evolution and H2O2 production
被引:22
作者:
Ye, Baoqian
[1
]
Tang, Hua
[2
]
Liu, Qinqin
[1
]
Wang, Weikang
[1
]
Wang, Lele
[1
]
Hu, Jie
[1
]
机构:
[1] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China
[2] Qingdao Univ, Sch Environm Sci & Engn, Qingdao 266071, Shandong, Peoples R China
来源:
基金:
中国国家自然科学基金;
关键词:
Pyridine rings;
Carbon nitride;
n-conjugated system;
H;
2;
production;
O;
G-C3N4;
PHOTOCATALYST;
ELECTRONIC-STRUCTURE;
HYDROGEN-PEROXIDE;
NANOSHEETS;
OXYGEN;
WATER;
FABRICATION;
REDUCTION;
STRATEGY;
PAPER;
D O I:
10.1016/j.carbon.2022.12.075
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
The extended n-conjugated system in polymer semiconductors holds a great potential in tuning the delocalized electrons for promoting photocatalytic efficiency. Herein, n-conjugate pyridine rings and nitrogen defects co-decorated polymer carbon nitride nanosheet (NCN-2AP-X) was constructed and applied in solar driven hydrogen (H2) and hydrogen peroxide (H2O2) production. Benefiting from synergistic effect of pyridine rings and N vacancies, the synthesized NCN-2AP photocatalyst with rich delocalized electrons indicates the extended light absorption range and improved carrier separation capability, particularly favoring the photocatalytic reactions. The optimal NCN-2AP-10 displayed an excellent H2 production rate of 2.55 mmol g-1 h-1 under visible-light irradiation with apparent quantum efficiency (AQE) of 9.79% at 420 nm. Moreover, a H2O2 production rate of 1.39 mmol L-1 h-1 was achieved by NCN-2AP-10 under monochromatic light (365 nm) irradiation. This work would provide a new view in designing the n-conjugated system incorporating metal-free photocatalysts for efficient H2 and H2O2 production.
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页码:465 / 474
页数:10
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