Sulfur vacancy and p-n junction synergistically boosting interfacial charge transfer and separation in ZnIn 2 S 4 /NiWO 4 heterostructure for enhanced photocatalytic hydrogen evolution
Constructing a p-n heterojunction with vacancy is advantageous for speeding up carrier separation and migration due to the synergy of the built-in electric field and electron capture of the vacancy. Herein, a sulfur vacancy riched-ZnIn S /NiWO p-n heterojunction (VZIS/NWO) photocatalyst was rational...
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Published in | Journal of colloid and interface science Vol. 634; p. 817 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
15.03.2023
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Subjects | |
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Abstract | Constructing a p-n heterojunction with vacancy is advantageous for speeding up carrier separation and migration due to the synergy of the built-in electric field and electron capture of the vacancy. Herein, a sulfur vacancy riched-ZnIn
S
/NiWO
p-n heterojunction (VZIS/NWO) photocatalyst was rationally designed and fabricated for photocatalytic hydrogen evolution. The composition and structure of VZIS/NWO were characterized. The existence of sulfur vacancy was confirmed through X-ray photoelectron spectroscopy, high-resolution transmission electron microscope, and electron paramagnetic resonance technology. The p-n heterojunction formed by ZnIn
S
and NiWO
was proved to provide a convenient channel to boost interfacial charge migration and separation. By reducing the band gap, the vacancy engineer can improve light absorption as well as serve as an electron trap to improve photo-induced electron-hole separation. Benefiting from the synergy of p-n heterojunction and vacancy, the optimal VZIS/NWO-5 catalyst exhibits dramatically enhanced H
generation performance, which is about 10-fold that of the pristine ZnIn
S
. This work emphasizes the synergy between p-n heterojunction and sulfur vacancy for enhancing photocatalytic hydrogen evolution performance. |
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AbstractList | Constructing a p-n heterojunction with vacancy is advantageous for speeding up carrier separation and migration due to the synergy of the built-in electric field and electron capture of the vacancy. Herein, a sulfur vacancy riched-ZnIn
S
/NiWO
p-n heterojunction (VZIS/NWO) photocatalyst was rationally designed and fabricated for photocatalytic hydrogen evolution. The composition and structure of VZIS/NWO were characterized. The existence of sulfur vacancy was confirmed through X-ray photoelectron spectroscopy, high-resolution transmission electron microscope, and electron paramagnetic resonance technology. The p-n heterojunction formed by ZnIn
S
and NiWO
was proved to provide a convenient channel to boost interfacial charge migration and separation. By reducing the band gap, the vacancy engineer can improve light absorption as well as serve as an electron trap to improve photo-induced electron-hole separation. Benefiting from the synergy of p-n heterojunction and vacancy, the optimal VZIS/NWO-5 catalyst exhibits dramatically enhanced H
generation performance, which is about 10-fold that of the pristine ZnIn
S
. This work emphasizes the synergy between p-n heterojunction and sulfur vacancy for enhancing photocatalytic hydrogen evolution performance. |
Author | Tan, Pengfei Yang, Lu Zhang, Mingyuan Tan, Xiyu Ren, Ruifeng Pan, Jun Liu, Hele Zhai, Huanhuan Chen, Jiaoyang |
Author_xml | – sequence: 1 givenname: Mingyuan surname: Zhang fullname: Zhang, Mingyuan organization: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China – sequence: 2 givenname: Pengfei surname: Tan fullname: Tan, Pengfei email: tpf0203@csu.edu.cn organization: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China. Electronic address: tpf0203@csu.edu.cn – sequence: 3 givenname: Lu surname: Yang fullname: Yang, Lu organization: Hunan Province Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, PR China – sequence: 4 givenname: Huanhuan surname: Zhai fullname: Zhai, Huanhuan organization: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China – sequence: 5 givenname: Hele surname: Liu fullname: Liu, Hele organization: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China – sequence: 6 givenname: Jiaoyang surname: Chen fullname: Chen, Jiaoyang organization: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China – sequence: 7 givenname: Ruifeng surname: Ren fullname: Ren, Ruifeng organization: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China – sequence: 8 givenname: Xiyu surname: Tan fullname: Tan, Xiyu email: tanxiyu@hnpa.edu.cn organization: Department for Crimial Science and Technology, Hunan Police Academy, Yuanda Three Road 9, Changsha 410138, PR China. Electronic address: tanxiyu@hnpa.edu.cn – sequence: 9 givenname: Jun surname: Pan fullname: Pan, Jun email: jun.pan@csu.edu.cn organization: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China. Electronic address: jun.pan@csu.edu.cn |
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Keywords | ZnInS/NiWO Photocatalytic hydrogen evolution P-n junction Vacancy |
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Title | Sulfur vacancy and p-n junction synergistically boosting interfacial charge transfer and separation in ZnIn 2 S 4 /NiWO 4 heterostructure for enhanced photocatalytic hydrogen evolution |
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