Porous carbon nitride with defect mediated interfacial oxidation for improving visible light photocatalytic hydrogen evolution

被引：69

作者：

Zhang, Zhao ^{[1
]}

Lu, Luhua ^{[1
,2
]}

Lv, Zaozao ^{[1
]}

Chen, Ying ^{[1
,2
]}

Jin, Hongyun ^{[1
]}

Hou, Shuen ^{[1
]}

Qiu, Lixin ^{[3
]}

Duan, Limei ^{[3
]}

Liu, Jinghai ^{[3
]}

Dai, Kai ^{[4
]}

机构：

[1] China Univ Geosci, Fac Mat Sci & Chem, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China

[2] China Univ Geosci Wuhan, Zhejiang Inst, Hangzhou 311305, Zhejiang, Peoples R China

[3] Inner Mongolia Univ Nationalities, Coll Chem & Chem Engn, Inner Mongolia Key Lab Carbon Nanomat, Tongliao 028000, Peoples R China

[4] Huaibei Normal Univ, Coll Phys & Elect Informat, Huaibei 235000, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 232卷

基金：

中国国家自然科学基金;

关键词：

Graphitic carbon nitride; Defects; Porous; Interfacial oxidation; Photocatalytic hydrogen evolution; EFFICIENT PHOTOCATALYST; WATER; IRRADIATION; PERFORMANCE; HETEROJUNCTIONS; SEMICONDUCTORS; COCATALYSTS; GENERATION; G-C3N4; H-2;

D O I：

10.1016/j.apcatb.2018.03.086

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：

The Feasibility of interfacial redox reaction has determinant role in hydrogen evolution during photocatalytic water-splitting process. Here, we report that promoting interfacial oxidation ability of porous graphitic carbon nitride (Pg-C3N4) with defects can effectively improve visible light photocatalytic hydrogen evolution (PHE) activity. Pg-C3N4 with edge site defects was fabricated by constraining growth of g-C3N4 on porous kaolinite-derived template. The Pg-C3N4 with extra electrons of defects caused by enriched basal plane holes exhibits higher electrocatalytic activity for oxidation process in comparison with reduction process. This feature benefits electron-transfer reaction to quench photo-excited holes during photocatalysis process and promote photoelectrons reaction, which was proved by photoluminescence spectra of Pg-C3N4 and g-C3N4 and different PHE activity variation of their heterojunction materials with TiO2. The results show that PHE rate for Pg-C3N4 reaches 1917 umol(-1) g(-1) h(-1), 2.37 times of g-C3N4 under visible light irradiation. This approach of engineering interfacial defects to accelerate hole's oxidation reactions during photocatalytic water-splitting would advance two-dimensional (2D) catalysis for solar fuel production.

引用

页码：384 / 390

页数：7

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