期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 9, 期 15, 页码 3896-3906出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cy00329k
关键词
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资金
- National Natural Science Foundation of China [11764018]
- Scientific Research Fund of Jiangxi Provincial Education Department [GJJ170569]
Visible-light driven photocatalytic hydrogen production from water is a hotspot in renewable energy. Recent experiments have proved that 2D/2D SiC/g-C3N4 heterojunctions exhibit greatly improved photocatalytic activities; still lacking is a fundamental understanding of the complex mechanism as well as rationally designed schemes for highly-effective SiC/g-C3N4 photocatalysts. Using state-of-the-art hybrid density functional theory, we uncover as many as 7 advantageous factors in SiC/g-C3N4 layered photocatalysts: (1) severe bending of g-C3N4, (2) formation of type-II heterojunctions, (3) ideal bandgap widths around 2.0 eV, (4) intimate interface contact and strong interfacial interactions, (5) considerable built-in electric field, (6) suitable band edge positions, and (7) near-zero Gibbs free-energy (Delta G(H*)). This theoretical work not only offers a comprehensive insight into the enhanced photocatalytic mechanism for 2D/2D SiC/g-C3N4 heterojunctions, but also provides rational strategies for designing highly-effective SiC/g-C3N4 photocatalysts in producing hydrogen.
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