BiOBr/CN 2D/2D异质结高效光催化CO<sub>2</sub>还原

摘要新型高效光催化剂的开发是光催化还原CO₂领域的重要课题。近年来,因具有独特的可调层状结构和优异的光生电荷分离能力,二维卤氧化铋成为了备受关注的光催化材料。基于二维(2D)异质结催化剂具有带隙可调、电荷转移距离短等优点,旨在制备尺寸匹配的BiOBr/CN 2D/2D异质结光催化剂,并考察其光催化还原CO₂性能。将BiOBr纳米片原位生长在氮化碳(CN)纳米片表面,以不同CN用量制备了一系列BiOBr/CN复合光催化剂。通过XRD、FTIR、SEM、TEM、HRTEM和XPS等方法对BiOBr/CN的组成及2D/2D异质结构进行表征。光催化还原CO₂性能结果表明,合成的BiOBr/CN复合光催化剂均表现出比单独的CN和BiOBr增强的光催化活性,其中BiOBr/CN-0.15性能最佳,CO产率达到6.6 μmol·g^-1·h^-1,分别是CN和BiOBr的3.8倍和16.0倍,CH₄产率达到0.7 μmol·g^-1·h^-1,是CN的3.0倍。能带结构分析以及光电测试表明,BiOBr与CN复合形成II型异质结,异质结存在促进了光生载流子的分离和迁移,使更多光生电子达到催化剂表面参与CO₂还原反应,从而光催化还原CO₂性能显著提高。对BiOBr基2D/2D异质结光催化剂的设计和应用具有重要价值。

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	刘雪美
	罗绣毓
	王华

关键词：光催化还原二氧化碳异质结氮化碳 BiOBr

Abstract： It is an important subject for the development of new and efficient photocatalysts for the photocatalytic reduction of CO₂. In recent years, two-dimensional bismuth halide oxide has become a photocatalytic material of great interest due to its unique tunable layered structure and excellent photogenerated charge separation ability. In this study, based on the advantages of two-dimensional (2D) heterojunction catalysts with tunable band gap and short charge transfer distance, we aim to prepare size-matched BiOBr/CN 2D/2D heterojunction photocatalysts and investigate their photocatalytic CO₂ reduction performance. A series of BiOBr/CN composite photocatalysts were prepared by varying the amount of CN added. The morphology and structure of the BiOBr/CN composites were characterised by XRD, FTIR, SEM, TEM, HRTEM and XPS, and the successful preparation of the 2D/2D composites was confirmed. The results of the photocatalytic CO₂ reduction tests showed that all the BiOBr/CN composite photocatalysts exhibited enhanced photocatalytic activity compared to pure CN and BiOBr. Within 3 h of illumination, BiOBr/CN-0.15 showed the best photocatalytic activity with a CO evolution rate of 6.6 μmol·g^-1·h^-1, 3.8 and 16.0 times that of CN and BiOBr, respectively, and a CH₄ production rate of 0.7 μmol·g^-1·h^-1, three times that of CN. The results of band structure, PL spectra and electrochemical tests showed that a type II heterojunction was formed by combining BiOBr and CN, and the presence of the heterojunction promoted the separation and migration of photogenerated carriers, allowing more photogenerated electrons to reach the catalyst surface and participate in the CO₂ reduction reaction, thus significantly improving the performance of photocatalytic CO₂ reduction. This study is of great value for the design and application of BiOBr-based 2D/2D heterojunction photocatalysts.

Keywords： photocatalytic reduction of CO₂ heterojunction carbon nitride BiOBr

Received 2023-05-03;

Fund:国家自然科学基金(22178266)。

Corresponding Authors: 王华,副教授,E-mail:tjuwanghua@tju.edu.cn。 Email: tjuwanghua@tju.edu.cn

About author: 刘雪美(1998—),女,硕士研究生,研究方向为光催化还原二氧化碳。

引用本文:

刘雪美, 罗绣毓, 王华.BiOBr/CN 2D/2D异质结高效光催化CO₂还原[J]. 化学工业与工程, 2024,41(6): 1-11

LIU Xuemei, LUO Xiuyu, WANG Hua.Preparation of BiOBr/CN heterojunctions and analysis of the performance of photocatalytic reduction of CO₂[J]. Chemcial Industry and Engineering, 2024,41(6): 1-11

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