Crystalline carbon nitride anchored on MXene as an ordered Schottky heterojunction photocatalyst for enhanced visible-light hydrogen evolution

Carbon nitride (CN) polymer is considered as a potential material for photocatalysis, but surfers from the low photoconversion efficiency due to its high defect density. Although the defects can be limited through the crystallization of CN, the photocatalytic activity of single-component photocataly...

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Published inCarbon (New York) Vol. 179; pp. 387 - 399
Main Authors Li, Jinmao, Li, Jin, Wu, Congcong, Li, Zuhong, Cai, Liwei, Tang, Hong, Zhou, Zezhu, Wang, Guohong, Wang, Juan, Zhao, Li, Wang, Shimin
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.07.2021
Elsevier BV
Subjects
Carbon
Carbon nitride
Catalytic activity
Charge transfer
Crystal defects
Crystal structure
Crystalline carbon nitride
Crystallinity
Crystallization
Heterojunctions
Hydrogen evolution
Ionothermal method
MXene
MXenes
Photocatalysis
Photocatalysts
Photocatalytic hydrogen evolution
Quantum efficiency
Schottky heterojunction
Synergistic effect
Schottky heterojunction
Ionothermal method
Photocatalytic hydrogen evolution
Crystalline carbon nitride
MXene
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Summary:Carbon nitride (CN) polymer is considered as a potential material for photocatalysis, but surfers from the low photoconversion efficiency due to its high defect density. Although the defects can be limited through the crystallization of CN, the photocatalytic activity of single-component photocatalyst is still restricted by the recombination of photoexcited carriers. In our work, the ordered Schottky heterojunction of heptazine-based crystalline carbon nitride (HCN) and Ti3C2 MXene was successfully prepared through ionothermal method. The HCN/Ti3C2 composites exhibit higher photocatalytic performance than pristine HCN. Particularly, the HCNT20 sample exhibits the highest photocatalytic H2 evolution activity, which is about 8 and 2 times higher than that of bulk CN and pristine HCN, respectively. The results of charge transfer dynamics and DFT calculation reveal that the photocatalytic enhancement mechanism is primarily attributed to the synergistic effects of crystallization of CN, excellent conductivity of Ti3C2 and well-constructed Schottky heterojunction. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2021.04.046