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Volume 11
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10.3390/pr11102827
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Article

The Highly Enhanced Efficiency of the Photocatalytic Reduction of CO2 over Bi2WO6 Nanosheets by NaOH Microregulation

by
Chao Song
1,
Yangang Sun
1,*,
Li Zhang
1,
Shuang Liu
1,
Jinguo Wang
1,
Wei An
1,
Yong Men
1,2,* and
Zhenrong Yan
2,3,*
1
School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
2
Mechanical Industrial Key Laboratory of Boiler Low-Carbon Technology, Shanghai University of Engineering Science, Shanghai 201620, China
3
School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
*
Authors to whom correspondence should be addressed.
Processes 2023, 11(10), 2827; https://doi.org/10.3390/pr11102827
Submission received: 28 August 2023 / Revised: 10 September 2023 / Accepted: 12 September 2023 / Published: 25 September 2023
(This article belongs to the Section Catalysis Enhanced Processes)
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Abstract

The photoreduction of CO2 to other products containing carbon through simulated photosynthesis is a promising area of research. However, given the complexity of the CO2 photocatalytic reduction reaction, it is crucial to adjust the structure of the photocatalysts. The focus of this study was on creating NaOH-modified Bi2WO6 nanosheet photocatalysts via a one-step hydrothermal route and using them to convert CO2 into CO through photocatalytic reduction under the condition of not using an electron sacrifice agent. The results of characterizations and activity data showed that adding an appropriate amount of NaOH significantly improved the photoreduction activity of CO2, as seen in the BWO-2 catalyst. The efficiency of photocatalysts could be improved by tuning the band structure through the addition of an appropriate amount of alkali. This adjustment improves the separation of photogenerated carriers and controls the concentration of oxygen vacancy to reduce recombination. As a result, the photocurrent activity is highly enhanced, leading to better reduction performance compared to unmodified photocatalysts. In experiments, the CO yield of the modified photocatalyst BWO-2 remained above 90 μmol/g after four trials, indicating its effectiveness in reducing CO2. This study offers insights into the regulation of band structure in bismuth-based photocatalysts for efficient CO2 reduction.
Keywords: photocatalysis; band gap structure; sheet structure; alkali solution corrosion; CO2 photoreduction photocatalysis; band gap structure; sheet structure; alkali solution corrosion; CO2 photoreduction

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MDPI and ACS Style

Song, C.; Sun, Y.; Zhang, L.; Liu, S.; Wang, J.; An, W.; Men, Y.; Yan, Z. The Highly Enhanced Efficiency of the Photocatalytic Reduction of CO2 over Bi2WO6 Nanosheets by NaOH Microregulation. Processes 2023, 11, 2827. https://doi.org/10.3390/pr11102827

AMA Style

Song C, Sun Y, Zhang L, Liu S, Wang J, An W, Men Y, Yan Z. The Highly Enhanced Efficiency of the Photocatalytic Reduction of CO2 over Bi2WO6 Nanosheets by NaOH Microregulation. Processes. 2023; 11(10):2827. https://doi.org/10.3390/pr11102827

Chicago/Turabian Style

Song, Chao, Yangang Sun, Li Zhang, Shuang Liu, Jinguo Wang, Wei An, Yong Men, and Zhenrong Yan. 2023. "The Highly Enhanced Efficiency of the Photocatalytic Reduction of CO2 over Bi2WO6 Nanosheets by NaOH Microregulation" Processes 11, no. 10: 2827. https://doi.org/10.3390/pr11102827

APA Style

Song, C., Sun, Y., Zhang, L., Liu, S., Wang, J., An, W., Men, Y., & Yan, Z. (2023). The Highly Enhanced Efficiency of the Photocatalytic Reduction of CO2 over Bi2WO6 Nanosheets by NaOH Microregulation. Processes, 11(10), 2827. https://doi.org/10.3390/pr11102827

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