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
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.
引用
收藏
页码:465 / 474
页数:10
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