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Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges

Using sunlight to convert CO(2) into solar fuel is an ideal solution to both global warming and the energy crisis. The construction of direct Z-scheme heterojunctions is an effective method to overcome the shortcomings of single-component or conventional heterogeneous photocatalysts for photocatalyt...

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Autores principales: Xu, Yong, Yu, Juanjuan, Long, Jianfei, Tu, Lingxiao, Dai, Weili, Yang, Lixia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9229445/
https://www.ncbi.nlm.nih.gov/pubmed/35745369
http://dx.doi.org/10.3390/nano12122030
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author Xu, Yong
Yu, Juanjuan
Long, Jianfei
Tu, Lingxiao
Dai, Weili
Yang, Lixia
author_facet Xu, Yong
Yu, Juanjuan
Long, Jianfei
Tu, Lingxiao
Dai, Weili
Yang, Lixia
author_sort Xu, Yong
collection PubMed
description Using sunlight to convert CO(2) into solar fuel is an ideal solution to both global warming and the energy crisis. The construction of direct Z-scheme heterojunctions is an effective method to overcome the shortcomings of single-component or conventional heterogeneous photocatalysts for photocatalytic CO(2) (carbon dioxide) reduction. In this work, a composite photocatalyst of narrow-gap SnS(2) and stable oxide Bi(2)WO(6) were prepared by a simple hydrothermal method. The combination of Bi(2)WO(6) and SnS(2) narrows the bandgap, thereby broadening the absorption edge and increasing the absorption intensity of visible light. Photoluminescence, transient photocurrent, and electrochemical impedance showed that the coupling of SnS(2) and Bi(2)WO(6) enhanced the efficiency of photogenerated charge separation. The experimental results show that the electron transfer in the Z-scheme heterojunction of SnS(2)/Bi(2)WO(6) enables the CO(2) reduction reactions to take place. The photocatalytic reduction of CO(2) is carried out in pure water phase without electron donor, and the products are only methanol and ethanol. By constructing a Z-scheme heterojunction, the photocatalytic activity of the SnS(2)/Bi(2)WO(6) composite was improved to 3.3 times that of pure SnS(2).
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spelling pubmed-92294452022-06-25 Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges Xu, Yong Yu, Juanjuan Long, Jianfei Tu, Lingxiao Dai, Weili Yang, Lixia Nanomaterials (Basel) Article Using sunlight to convert CO(2) into solar fuel is an ideal solution to both global warming and the energy crisis. The construction of direct Z-scheme heterojunctions is an effective method to overcome the shortcomings of single-component or conventional heterogeneous photocatalysts for photocatalytic CO(2) (carbon dioxide) reduction. In this work, a composite photocatalyst of narrow-gap SnS(2) and stable oxide Bi(2)WO(6) were prepared by a simple hydrothermal method. The combination of Bi(2)WO(6) and SnS(2) narrows the bandgap, thereby broadening the absorption edge and increasing the absorption intensity of visible light. Photoluminescence, transient photocurrent, and electrochemical impedance showed that the coupling of SnS(2) and Bi(2)WO(6) enhanced the efficiency of photogenerated charge separation. The experimental results show that the electron transfer in the Z-scheme heterojunction of SnS(2)/Bi(2)WO(6) enables the CO(2) reduction reactions to take place. The photocatalytic reduction of CO(2) is carried out in pure water phase without electron donor, and the products are only methanol and ethanol. By constructing a Z-scheme heterojunction, the photocatalytic activity of the SnS(2)/Bi(2)WO(6) composite was improved to 3.3 times that of pure SnS(2). MDPI 2022-06-13 /pmc/articles/PMC9229445/ /pubmed/35745369 http://dx.doi.org/10.3390/nano12122030 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xu, Yong
Yu, Juanjuan
Long, Jianfei
Tu, Lingxiao
Dai, Weili
Yang, Lixia
Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges
title Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges
title_full Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges
title_fullStr Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges
title_full_unstemmed Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges
title_short Z-Scheme Heterojunction of SnS(2)/Bi(2)WO(6) for Photoreduction of CO(2) to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges
title_sort z-scheme heterojunction of sns(2)/bi(2)wo(6) for photoreduction of co(2) to 100% alcohol products by promoting the separation of photogenerated charges
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9229445/
https://www.ncbi.nlm.nih.gov/pubmed/35745369
http://dx.doi.org/10.3390/nano12122030
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