Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions
The effectiveness of charge transfer and separation between bulk phase and the interface is crucial for evaluating the performance of photocatalysts. In this study, NiMoO4 was employed to enhance the photocatalytic activity for hydrogen (H2) evolution in twinned Cd0.5Zn0.5S (T-CZS) homojunctions com...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/180173 |
| _version_ | 1811693917420126208 |
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| author | Tian, Jingzhuo Cao, Xiaofei Sun, Tao Miao, Hui Chen, Zhong Xue, Wenhua Fan, Jun Liu, Enzhou |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Tian, Jingzhuo Cao, Xiaofei Sun, Tao Miao, Hui Chen, Zhong Xue, Wenhua Fan, Jun Liu, Enzhou |
| author_sort | Tian, Jingzhuo |
| collection | NTU |
| description | The effectiveness of charge transfer and separation between bulk phase and the interface is crucial for evaluating the performance of photocatalysts. In this study, NiMoO4 was employed to enhance the photocatalytic activity for hydrogen (H2) evolution in twinned Cd0.5Zn0.5S (T-CZS) homojunctions comprising of wurtzite Cd0.5Zn0.5S (WZ-CZS) and zinc blende Cd0.5Zn0.5S (ZB-CZS) with alternating arrangements. The investigation reveals that the introduction of NiMoO4 can lead to an increase of active sites for H2 evolution, a prolongation of charge carrier lifetime, and a decrease of H2 evolution overpotential. The H2 production rate of 8 wt% NiMoO4/T-CZS reaches up to 71.2 mmol h−1 g−1, while its apparent quantum efficiency (AQY) is 8.23% at 400 nm. The enhanced activity can be attributed to the synergistic effects of homojunctions and heterojunctions in NiMoO4/T-CZS. According to the density functional theory (DFT), photoelectric response, and radical trapping experimental analysis, the charge transfer between WZ-CZS and ZB-CZS in T-CZS, as well as NiMoO4 and T-CZS, both follow the S-scheme pathway under the influence of band bending, Coulombic force, and built-in electric field. This leads to an effective internal and interfacial charge separation in NiMoO4/T-CZS homo-heterojunctions, while maintaining their high reactivity. Additionally, the H2 evolution activity of T-CZS can also be increased in different degrees by various metal molybdates (MMoO4) including CoMoO4, Ag2MoO4, Bi2(MoO4)3, BaMoO4, ZnMoO4, and CdMoO4. The bulk and interfacial synergistic double S-scheme homo-heterojunctions in this study provide new insights for targeted solar driven H2 evolution engineering. |
| first_indexed | 2024-10-01T06:59:18Z |
| format | Journal Article |
| id | ntu-10356/180173 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:59:18Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1801732024-09-23T02:34:41Z Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions Tian, Jingzhuo Cao, Xiaofei Sun, Tao Miao, Hui Chen, Zhong Xue, Wenhua Fan, Jun Liu, Enzhou School of Materials Science and Engineering Engineering Photocatalyst Double S-Scheme The effectiveness of charge transfer and separation between bulk phase and the interface is crucial for evaluating the performance of photocatalysts. In this study, NiMoO4 was employed to enhance the photocatalytic activity for hydrogen (H2) evolution in twinned Cd0.5Zn0.5S (T-CZS) homojunctions comprising of wurtzite Cd0.5Zn0.5S (WZ-CZS) and zinc blende Cd0.5Zn0.5S (ZB-CZS) with alternating arrangements. The investigation reveals that the introduction of NiMoO4 can lead to an increase of active sites for H2 evolution, a prolongation of charge carrier lifetime, and a decrease of H2 evolution overpotential. The H2 production rate of 8 wt% NiMoO4/T-CZS reaches up to 71.2 mmol h−1 g−1, while its apparent quantum efficiency (AQY) is 8.23% at 400 nm. The enhanced activity can be attributed to the synergistic effects of homojunctions and heterojunctions in NiMoO4/T-CZS. According to the density functional theory (DFT), photoelectric response, and radical trapping experimental analysis, the charge transfer between WZ-CZS and ZB-CZS in T-CZS, as well as NiMoO4 and T-CZS, both follow the S-scheme pathway under the influence of band bending, Coulombic force, and built-in electric field. This leads to an effective internal and interfacial charge separation in NiMoO4/T-CZS homo-heterojunctions, while maintaining their high reactivity. Additionally, the H2 evolution activity of T-CZS can also be increased in different degrees by various metal molybdates (MMoO4) including CoMoO4, Ag2MoO4, Bi2(MoO4)3, BaMoO4, ZnMoO4, and CdMoO4. The bulk and interfacial synergistic double S-scheme homo-heterojunctions in this study provide new insights for targeted solar driven H2 evolution engineering. This work was supported by the National Natural Science Foundation of China Grant numbers: 22378326, 11974276, 22078261, Natural Science Basic Research Program of Shaanxi Province Grant numbers: 2023-JC-YB-115, and Shaanxi Key Science and Technology Innovation Team Project Grant numbers: 2022TD-33. Qin Chuangyuan project of Shaanxi Province Grant numbers: QCYRCXM-2022-213. 2024-09-23T02:34:41Z 2024-09-23T02:34:41Z 2024 Journal Article Tian, J., Cao, X., Sun, T., Miao, H., Chen, Z., Xue, W., Fan, J. & Liu, E. (2024). Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions. Composites Part B: Engineering, 277, 111389-. https://dx.doi.org/10.1016/j.compositesb.2024.111389 1359-8368 https://hdl.handle.net/10356/180173 10.1016/j.compositesb.2024.111389 2-s2.0-85188252407 277 111389 en Composites Part B: Engineering © 2024 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering Photocatalyst Double S-Scheme Tian, Jingzhuo Cao, Xiaofei Sun, Tao Miao, Hui Chen, Zhong Xue, Wenhua Fan, Jun Liu, Enzhou Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions |
| title | Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions |
| title_full | Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions |
| title_fullStr | Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions |
| title_full_unstemmed | Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions |
| title_short | Efficient photocatalytic H2 evolution over NiMoO4/twinned-Cd0.5Zn0.5S double S-scheme homo-heterojunctions |
| title_sort | efficient photocatalytic h2 evolution over nimoo4 twinned cd0 5zn0 5s double s scheme homo heterojunctions |
| topic | Engineering Photocatalyst Double S-Scheme |
| url | https://hdl.handle.net/10356/180173 |
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