Homojunction and ohmic contact coexisting carbon nitride for efficient photocatalytic hydrogen evolution

被引:12
|
作者
Fang, Xiao [1 ]
Chen, Lu [1 ]
Cheng, Hongrui [2 ]
Bian, Xiaoqiong [1 ]
Sun, Wenhao [1 ,4 ]
Ding, Kaining [1 ]
Xia, Xinghe [1 ]
Chen, Xin [1 ]
Zhu, Jiefang [4 ,5 ]
Zheng, Yuanhui [1 ,2 ,3 ]
机构
[1] Fuzhou Univ, Coll Chem, Fujian Prov Key Lab Adv Inorgan Oxygenated Mat, Fuzhou 350116, Peoples R China
[2] Fujian Sci & Technol Innovat Lab Optoelect Informa, Fuzhou 350116, Peoples R China
[3] Fuzhou Univ, Coll Phys & Informat Engn, Fuzhou 350116, Peoples R China
[4] Uppsala Univ, Dept Chem, Angstrom Lab, SE-75121 Uppsala, Sweden
[5] East China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China
基金
中国国家自然科学基金;
关键词
carbon nitride; photocatalysis; homojunction; ohmic contact; hydrogen evolution; EXCITON DISSOCIATION; CRYSTALLINE; SEMICONDUCTORS; NANOSHEETS; ABSORPTION; CATALYSTS;
D O I
10.1007/s12274-023-5504-6
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
Carbon nitride (CN) has attracted intensive attention as a visible light photocatalyst, but the rapid recombination of photogenerated charge carriers limits its photocatalytic activity. Herein, we develop a new strategy to construct both homojunction and ohmic junction into CN via selectively introducing metallized CN (MCN), which leads to rapid separation and transfer of photogenerated charge carriers. The polymerization of urea in the presence of KOH creates CN homojunction with amino and cyano groups. The subsequent molten salt treatment induces a new type of cyano-terminated CN that can be converted to MCN through photodoping, forming homojunction and ohmic contact coexisting CN (HOCN). The formed HOCN photocatalyst exhibits a high photocatalytic H-2 evolution rate of 18.5 mmol.g(-1).h(-1) under visible light irradiation, 45-fold higher than that of bulk CN. This strategy provides a new idea for designing ohmic contact between semiconductor and metal, and realizing efficient photocatalysis by improving charge separation and transfer.
引用
收藏
页码:8782 / 8792
页数:11
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