2D/2D Bi2WO6/C3N5 S-scheme heterojunction for highly selective production of CH4 by photocatalytic CO2 reduction under visible light

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2024-08-28 DOI:10.1016/j.apcata.2024.119914

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Abstract

Photocatalytic CO₂ reduction is a practical solution to the energy dilemma and environmental damage caused by greenhouse gases, and it is very important to explore high-efficiency photocatalysts. In this study, a novel Bi₂WO₆/C₃N₅ step(S)-scheme heterojunction was successfully constructed and applied for CO₂ photoreduction. The 2D/2D structure showed excellent photocatalytic properties, with methane production reaching 1.976 μmol·g⁻¹·h⁻¹ and selectivity reaching 100 % under 5 hours of visible light irradiation. The result indicates that combining Bi₂WO₆ and C₃N₅ can promote interfacial charge separation and maintain the optimal reducing ability of photogenerated electrons. Based on experimental and theoretical calculations, we characterized the reaction mechanism and heterojunction formation mechanism. This study offers a novel approach to improve the selectivity and photocatalytic efficiency of CO₂ reduction products.

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二维/二维 Bi2WO6/C3N5 S 型异质结在可见光下通过光催化二氧化碳还原高选择性地生产 CH4

光催化还原二氧化碳是解决温室气体造成的能源困境和环境破坏的一种切实可行的方法，因此探索高效光催化剂非常重要。本研究成功构建了一种新型的 Bi2WO6/C3N5 阶（S）型异质结，并将其应用于二氧化碳的光催化还原。在可见光照射 5 小时后，该 2D/2D 结构显示出优异的光催化性能，甲烷产量达到 1.976 μmol-g-1-h-1，选择性达到 100%。结果表明，将 Bi2WO6 和 C3N5 结合在一起可促进界面电荷分离，保持光生电子的最佳还原能力。基于实验和理论计算，我们对反应机理和异质结形成机理进行了表征。这项研究为提高二氧化碳还原产物的选择性和光催化效率提供了一种新方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.

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