Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges
Using sunlight to convert CO<sub>2</sub> 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 photocatal...
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MDPI AG
2022-06-01
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| Series: | Nanomaterials |
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| author | Yong Xu Juanjuan Yu Jianfei Long Lingxiao Tu Weili Dai Lixia Yang |
| author_facet | Yong Xu Juanjuan Yu Jianfei Long Lingxiao Tu Weili Dai Lixia Yang |
| author_sort | Yong Xu |
| collection | DOAJ |
| description | Using sunlight to convert CO<sub>2</sub> 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<sub>2</sub> (carbon dioxide) reduction. In this work, a composite photocatalyst of narrow-gap SnS<sub>2</sub> and stable oxide Bi<sub>2</sub>WO<sub>6</sub> were prepared by a simple hydrothermal method. The combination of Bi<sub>2</sub>WO<sub>6</sub> and SnS<sub>2</sub> 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<sub>2</sub> and Bi<sub>2</sub>WO<sub>6</sub> enhanced the efficiency of photogenerated charge separation. The experimental results show that the electron transfer in the Z-scheme heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> enables the CO<sub>2</sub> reduction reactions to take place. The photocatalytic reduction of CO<sub>2</sub> 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<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> composite was improved to 3.3 times that of pure SnS<sub>2</sub>. |
| first_indexed | 2024-03-09T22:52:57Z |
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| language | English |
| last_indexed | 2024-03-09T22:52:57Z |
| publishDate | 2022-06-01 |
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| series | Nanomaterials |
| spelling | doaj.art-1f774a278bab4b9cb42543ef2ffd968e2023-11-23T18:16:22ZengMDPI AGNanomaterials2079-49912022-06-011212203010.3390/nano12122030Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated ChargesYong Xu0Juanjuan Yu1Jianfei Long2Lingxiao Tu3Weili Dai4Lixia Yang5Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, ChinaKey Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, ChinaKey Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, ChinaKey Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, ChinaKey Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, ChinaKey Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, ChinaUsing sunlight to convert CO<sub>2</sub> 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<sub>2</sub> (carbon dioxide) reduction. In this work, a composite photocatalyst of narrow-gap SnS<sub>2</sub> and stable oxide Bi<sub>2</sub>WO<sub>6</sub> were prepared by a simple hydrothermal method. The combination of Bi<sub>2</sub>WO<sub>6</sub> and SnS<sub>2</sub> 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<sub>2</sub> and Bi<sub>2</sub>WO<sub>6</sub> enhanced the efficiency of photogenerated charge separation. The experimental results show that the electron transfer in the Z-scheme heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> enables the CO<sub>2</sub> reduction reactions to take place. The photocatalytic reduction of CO<sub>2</sub> 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<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> composite was improved to 3.3 times that of pure SnS<sub>2</sub>.https://www.mdpi.com/2079-4991/12/12/2030Bi<sub>2</sub>WO<sub>6</sub>SnS<sub>2</sub>photocatalytic CO<sub>2</sub> reductioncharge separationliquid phase products |
| spellingShingle | Yong Xu Juanjuan Yu Jianfei Long Lingxiao Tu Weili Dai Lixia Yang Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges Nanomaterials Bi<sub>2</sub>WO<sub>6</sub> SnS<sub>2</sub> photocatalytic CO<sub>2</sub> reduction charge separation liquid phase products |
| title | Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges |
| title_full | Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges |
| title_fullStr | Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges |
| title_full_unstemmed | Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges |
| title_short | Z-Scheme Heterojunction of SnS<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> for Photoreduction of CO<sub>2</sub> to 100% Alcohol Products by Promoting the Separation of Photogenerated Charges |
| title_sort | z scheme heterojunction of sns sub 2 sub bi sub 2 sub wo sub 6 sub for photoreduction of co sub 2 sub to 100 alcohol products by promoting the separation of photogenerated charges |
| topic | Bi<sub>2</sub>WO<sub>6</sub> SnS<sub>2</sub> photocatalytic CO<sub>2</sub> reduction charge separation liquid phase products |
| url | https://www.mdpi.com/2079-4991/12/12/2030 |
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