Enhanced Photocatalytic CO2 Reduction via CCH/g-C3N4 Heterojunction: Optimizing Charge Carrier Dynamics and Visible-Light Utilization

被引：0

作者：

Mo, Xinpeng ^{[1
]}

Zhong, Hong ^{[1
]}

Hu, Chenhuan ^{[1
]}

Jin, Haoxiong ^{[1
]}

Liu, Xianfeng ^{[1
]}

Liu, Huanhuan ^{[1
,2
]}

Zhang, Genqiang ^{[2
]}

机构：

[1] Zhejiang A&F Univ, Coll Chem & Mat Engn, Hangzhou 311300, Peoples R China

[2] Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China

来源：

CATALYSTS | 2025年 / 15卷 / 02期

基金：

中国国家自然科学基金;

关键词：

photocatalysis; CO2; reduction; cobalt carbonate hexahydrate; g-C3N4; heterojunction; G-C3N4; COCATALYST; COBALT;

D O I：

10.3390/catal15020184

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 photocatalytic CO2 reduction (PCR) into value-added fuels offers a promising solution to energy shortages and the greenhouse effect, thanks to the mild conditions and environmental sustainability. However, the activation of CO2 is challenging because of the thermodynamic stability and chemical inertness of CO2 molecules, which significantly restricts the efficiency of PCR. Cobalt carbonate hexahydrate (CCH), known for its excellent CO2 adsorption and activation properties, faces challenges like poor electron-hole separation and photoresponse. To address these issues, graphitic carbon nitride (CN) as a "pseudo-sensitizer" was introduced into the system by an in situ heterojunction synthesis strategy to produce CCH/CN photocatalyst, where Co-N bonds formed between CCH and CN enhance charge carrier migration and lower interfacial resistance. The CCH/CN catalyst achieved a CO production rate of 19.65 mu mol g(-1) h(-1), outperforming CCH, CN, and a mechanically mixed sample (Mix) by 7.74, 2.31, and 1.77 times, respectively. This work demonstrates an effective strategy for designing heterojunction catalysts to improve visible light utilization and charge transfer for efficient CO2 reduction.

引用

页数：13

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