Enhanced Photocatalytic CO2 Reduction over 2D/1D BiOBr0.5Cl0.5/WO3 S-Scheme Heterostructure

Citation: Bichen Zhu, Xiaoyang Hong, Liyong Tang, Qinqin Liu, Hua Tang. Enhanced Photocatalytic CO₂ Reduction over 2D/1D BiOBr_0.5Cl_0.5/WO₃ S-Scheme Heterostructure[J]. Acta Physico-Chimica Sinica, 2022, 38(7): 211100. doi: 10.3866/PKU.WHXB202111008 shu

二维/一维BiOBr_0.5Cl_0.5/WO₃ S型异质结助力光催化CO₂还原

朱弼辰 ^{1, †,} ,
洪小洋 ^{1, †,} ,
唐丽永 ^{1,
,} ,
刘芹芹 ^1, ,
唐华 ^{2,
,}

1.
江苏大学，材料科学与工程学院，江苏镇江 212013
2.
青岛大学，环境科学与工程学院，山东青岛 266071

通讯作者: 唐丽永, 1000003184@mail.ujs.edu.cn
唐华, huatang79@163.com

基金项目:
国家自然科学基金 21975110

国家自然科学基金 21972058

摘要: S型异质结不但可以提高载流子的分离效率，还可以维持较强的氧化还原能力。因此，构建S型异质是提高光催化二氧化碳还原反应的有效途径。本研究通过静电自组装法构建了具有近红外光响应(> 780 nm)的二维BiOBr_0.5Cl_0.5纳米片和一维WO₃纳米棒S型异质结光催化剂，并用于高效还原二氧化碳。能带位置和界面电子相互作用的综合分析表明：在光催化二氧化碳还原反应过程中，BiOBr_0.5Cl_0.5/WO₃遵循S型电子转移路径；不仅提高了载流子的高效分离，还维持了两相(BiOBr_0.5Cl_0.5和WO₃)较高的氧化还原能力。此外，二维纳米片/一维纳米棒的结构使得半导体之间具备良好的界面接触，有利于载流子的分离，且暴露更多的活性位点，最终提高催化效率。结果显示，BiOBr_0.5Cl_0.5/WO₃异质结催化剂表现出较高的CO₂还原能力和CO选择性，CO的产率高达16.68 μmol∙g^-1∙h^-1，分别是BiOBr_0.5Cl_0.5的1.7倍和WO₃的9.8倍。本工作为构建S型二维/一维异质结光催化剂高效还原二氧化碳提供了新的思路。

关键词:

English

Enhanced Photocatalytic CO₂ Reduction over 2D/1D BiOBr_0.5Cl_0.5/WO₃ S-Scheme Heterostructure

1.
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Province, China
2.
School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, Shandong Province, China
^† Contributed to this work equally.

Corresponding author: Liyong Tang, 1000003184@mail.ujs.edu.cn Hua Tang, huatang79@163.com

Received Date: 04 November 2021
Accepted Date: 01 December 2021
Revised Date: 27 November 2021
Available Online: 15 July 2022
Fund Project:

Abstract: Catalytic reduction of CO₂ to CO has been considered promising for converting the greenhouse gas into chemical intermediates. Compared to other catalytic methods, photocatalytic CO₂ reduction, which uses solar energy as the energy input, has attracted significant attention because it is a clean and inexhaustible resource. Therefore, using high-performance photocatalysts for effective CO₂ reduction under mild reaction conditions is an active research hotspot. However, several current photocatalysts suffer from low solar energy conversion efficiency due to the extensive charge recombination and few active sites, leading to low CO₂ reduction efficiency. Generally, constructing an S-scheme heterojunction can not only promote charge separation but also help maintain strong redox ability. Therefore, the S-scheme heterojunction is expected to help in achieving high conversion activity and CO₂ reduction efficiency. Here, 2D tetragonal BiOBr_0.5Cl_0.5 nanosheets and hexagonal WO₃ nanorods were prepared using a simple hydrothermal synthesis method, and the 2D/1D BiOBr_0.5Cl_0.5 nanosheets/WO₃ nanorods (BiOBr_0.5Cl_0.5/WO₃) S-scheme heterojunction with near infrared (NIR) light (> 780 nm) response were prepared via the electrostatic self-assembly method for the photocatalytic CO₂ reduction. Following characterization and analysis, including diffuse reflectance spectra (DRS), Mott-Schottky plots, transient photocurrent response, time-resolution photoluminescence spectrum (TRPL), electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and electron spin resonance (ESR) measurements, it can be demonstrated that an S-scheme carrier transfer route was formed between the 2D BiOBr_0.5Cl_0.5 nanosheets and 1D WO₃ nanorods. Driven by the internal electric field, which was formed between the two semiconductors, electron migration was boosted, thus inhibiting the recombination of photogenerated carriers, while the stronger redox ability was maintained, thus providing good reduction efficiency over BiOBr_0.5Cl_0.5/WO₃ composite in CO₂ reduction. In addition, the 2D/1D nanosheet/nanorod structure allowed for enhanced interface contact with abundant active sites, which favored charge separation and increased photocatalytic activity. Furthermore, the amount of WO₃ nanorods added during the preparation of the composites was altered, which led to the optimal amount of 5% (w, mass fraction) for the photocatalytic CO₂ reduction. As a result, the BiOBr_0.5Cl_0.5/WO₃ composite exhibited superior photocatalytic reduction performance with a CO yield of 16.68 μmol·g^-1·h^-1 in the presence of any precious metal cocatalyst or sacrificial agent, which was 1.7 and 9.8 times that of pure BiOBr_0.5Cl_0.5 and WO₃, respectively. In addition, the BiOBr_0.5Cl_0.5/WO₃ composite provided continuously increased CO yields with excellent selectivity under full-spectrum light irradiation, suggesting good photocatalytic stability. This work describes a novel idea for the construction of 2D/1D S-scheme heterojunction photocatalysts for efficient CO₂ reduction.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

二维/一维BiOBr_0.5Cl_0.5/WO₃ S型异质结助力光催化CO₂还原

通讯作者: 唐丽永, 1000003184@mail.ujs.edu.cn
唐华, huatang79@163.com

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Enhanced Photocatalytic CO₂ Reduction over 2D/1D BiOBr_0.5Cl_0.5/WO₃ S-Scheme Heterostructure

Corresponding author: Liyong Tang, 1000003184@mail.ujs.edu.cn Hua Tang, huatang79@163.com

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二维/一维BiOBr0.5Cl0.5/WO3 S型异质结助力光催化CO2还原

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