Defects enriched carbon nitride sponge with high surface area for enhanced photocatalytic hydrogen evolution

被引：0

作者：

Wu, Ming ^{[1
]}

Chen, Libo ^{[1
]}

Sheng, Ying ^{[1
]}

Song, Lizhi ^{[2
]}

Zhou, Hu ^{[1
]}

Jian, Jian ^{[1
]}

Huang, Tiefan ^{[1
]}

Liu, Botian ^{[3
]}

Li, Xiaoning ^{[4
]}

机构：

[1] Hunan Univ Sci & Technol, Funct Film Mat Engn Res Ctr Hunan Prov, Sch Chem & Chem Engn,Hunan Prov Key Lab Adv Mat Ne, Key Lab Theoret Organ Chem & Funct Mol Minist Educ, Xiangtan 411201, Peoples R China

[2] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China

[3] Guilin Univ Technol, Dept Chem & Biol Engn, Guangxi Key Lab Electrochem & Magneto Chem Funct M, Guilin 541004, Peoples R China

[4] RMIT Univ, Sch Sci, Melbourne, Vic 3000, Australia

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2025年 / 688卷

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

Carbon nitride; Photocatalysis; Hydrogen production; Defects; Porous; G-C3N4; WATER; SEMICONDUCTOR;

D O I：

10.1016/j.jcis.2025.02.130

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 limited efficiency of traditional photocatalysts necessitates innovative solutions for sustainable hydrogen production. In this study, a three-dimensional (3D) sponge-like porous carbon nitride (SCN-x) was successfully synthesized using a novel method involving the removal of unstable organic frameworks. The resulting SCN-x exhibits a highly interconnected network structure and significantly higher surface area (116.5 m2/g), compared to normal pure carbon nitride (PCN). Furthermore, this method introduces significant defects into SCN-x, such as additional foreign oxygen atoms, which not only modulate its band structure but also provide more active sites at the defects. These features increase the number of photo-induced electron-hole pairs due to enhanced light absorption, and suppresses their recombination by enabling them to efficiently participate in the reaction with increased number of active sites. As a result, compared to PCN, the optimal SCN-0.5 sample exhibits 86.6 times higher photocatalytic hydrogen production rate under visible light irradiation, along with excellent stability and a high apparent quantum yield (AQY) of 5.8 % under 420 nm illumination. Furthermore, with additional calcination under air, the 2SCN-0.5 sample delivers a record-high hydrogen evolution rate of 1663.5 mu mol center dot h-1 center dot g- 1 under natural sunlight irradiation. This work presents a novel method for preparing a metal-free photocatalyst by introducing significant defects and a high surface area, enabling efficient large-scale hydrogen production under natural sunlight.

引用

页码：59 / 66

页数：8

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