g-C3N4 S-Scheme Homojunction through Van der Waals Interface Regulation by Intrinsic Polymerization Tailoring for Enhanced Photocatalytic H2 Evolution and CO2 Reduction

被引:0
作者
Zhu, Xianglin [1 ,2 ]
Zhou, Enlong [4 ]
Tai, Xishi [1 ]
Zong, Huibin [2 ]
Yi, Jianjian [5 ]
Yuan, Zhimin [1 ]
Zhao, Xingling [1 ]
Huang, Peng [3 ]
Xu, Hui [2 ]
Jiang, Zaiyong [1 ]
机构
[1] Weifang Univ, Sch Chem & Chem Engn & Environm Engn, Weifang 261061, Peoples R China
[2] Jiangsu Univ, Inst Energy Res, Sch Chem & Chem Engn, Zhenjiang 212013, Jiangsu, Peoples R China
[3] Jiangsu Normal Univ, Sch Chem & Mat Sci, Xuzhou 221116, Jiangsu, Peoples R China
[4] Shandong Agr Univ, Coll Chem & Mat Sci, Tai An 271018, Peoples R China
[5] Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou 225127, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Carbon Nitride; Homojunction; S-Scheme; Photocatalytic hydrogen evolution; Photocatalytic CO2 reduction; CHARGE MIGRATION; NANOSHEETS; NITRIDE; OXIDATION; SITES; WATER; O-2;
D O I
暂无
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The effective S-scheme homojunction relies on the precise regulation of band structure and construction of advantaged charge migration interfaces. Here, the electronic structural properties of g-C3N4 were modulated through meticulous polymerization of self-assembled supramolecular precursors. Experimental and DFT results indicate that both the intrinsic bandgap and surface electronic characteristics were adjusted, leading to the formation of an in-situ reconstructed homojunction interface facilitated by intrinsic van der Waals forces. The homojunction catalyst, composed of g-C3N4 nanodots and ultra-thin g-C3N4 nanoflakes, exhibited a significant S-scheme carrier separation mechanism, which enhances the utilization of electrons and holes. Consequently, under AM 1.5 light irradiation (~100 mW/cm(2)), the g-C3N4 homojunction photocatalyst achieved a remarkable hydrogen evolution rate of 580 mu mol h(-1). Furthermore, a reversed CH4 selectivity in CO2 reduction was observed, yielding 80.30 mu mol g(-1) h(-1) with a selectivity of 96.86 %, in contrast to the performance of bulk g-C3N4, which produced only 2.22 mu mol g(-1) h(-1) with the 15.69 % CH4 selectivity. These findings not only highlight the significant potential of the g-C3N4 homojunction photocatalyst for hydrogen production and CO2 reduction but also propose a superior and effective strategy for optimizing the structural properties of g-C3N4, which are crucial for the design of photocatalytic reactions.
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页数:12
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