Task-Specific Synthesis of 3D Porous Carbon Nitrides from the Cycloaddition Reaction and Sequential Self-Assembly Strategy toward Photocatalytic Hydrogen Evolution

被引:32
作者
Sun, Jingwen [1 ]
Yao, Fanglei [1 ]
Dai, Liming [1 ]
Deng, Jingyao [1 ]
Zhao, Hongan [1 ]
Zhang, Litong [1 ]
Huang, Yin [1 ]
Zou, Zhanhong [1 ]
Fu, Yongsheng [1 ]
Zhu, Junwu [1 ]
机构
[1] Nanjing Univ Sci & Technol, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China
关键词
carbon nitride; cyano defect; sodium; cycloaddition reaction; photocatalytic hydrogen evolution; G-C3N4; NANOSHEETS; CATALYSIS; DEFECTS; CYANO; WATER;
D O I
10.1021/acsami.0c14097
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Carbon nitride has drawn widespread attention as a low-cost alternative to metal-based materials in the field of photocatalysis. However, the traditionally synthesized carbon nitrides always suffer a bulky architecture, which limits their intrinsic activities. Here, a cycloaddition reaction is proposed to synthesize a triazine-based precursor with implanted sodium and cyano groups, which are mostly retained in the resulting carbon nitride after the following polymerization. Incorporated sodium and cyano defects can not only tune the band structure of the carbon nitride but also provide more additive active sites. The optimized properties enable it an adorable photocatalytic hydrogen evolution rate of 1070 mu mol h(-1) g(-1), varying by almost an order of magnitude from the pristine carbon nitride (79 mu mol h(-1) g(-1)). Moreover, a sequential self-assembly strategy has been adopted to further improve its architecture. As a consequence, a three-dimensional (3D) porous carbon nitride microtube cluster is constructed, indicating abundant exposed active sites and the faster separation of charge carriers. The corresponding photocatalytic hydrogen evolution rate is 1681 mu mol h(-1) g(-1), which is very competitive compared with the reported pure carbon nitride photocatalysts. Briefly, this new approach may offer opportunities to fabricate task-specific carbon- and nitrogen-based materials from the molecular level.
引用
收藏
页码:40433 / 40442
页数:10
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