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Two-dimensional Janus heterostructures for superior Z-scheme photocatalytic water splitting
DUT, Inst Energy Sci & Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
DUT, Inst Energy Sci & Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
DUT, Inst Energy Sci & Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
DUT, Inst Energy Sci & Technol, DUT KTH Joint Educ & Res Ctr Mol Devices, State Key Lab Fine Chem, Dalian 116024, Peoples R China..
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2019 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 59, p. 537-544Article in journal (Refereed) Published
Abstract [en]

Developing robust water splitting photocatalyst remains a pivot challenge for solar-to-fuel conversion. Herein, two-dimensional (2D) Janus bilayer heterostructures are reported by sulfur-vacancy-confined-in ZnIn2S4 (V-s-ZnIn2S4) and WO3 nanosheets as an all-solid-state Z-scheme prototype. First-principle calculations and experimental observations clearly confirm the spontaneous formation of this redox-mediator-free Z-scheme van der Waals heterostructure at atomic level, not only facilitating the space separation of photoexcited carriers with high charge density, enhancing charge dynamics and optimizing charge lifetime, but also accumulating electrons in conduction band of V-s-ZnIn2S4 and holes in valence band of WO3 by internal electric field through W-S bonds. After integrated by NiS quantum dots, novel 2D/2D NiS/V-s-ZnIn2S4/WO3 heterostructures with high stability exhibited an outstanding visible-light hydrogen evolution rate of 11.09 mmol g(-1)h(-1) and an apparent quantum efficiency about 72% at 420 nm, the highest value so far reported among the family of ZnIn(2)S(4 )photocatalysts. This work not only presents novel Janus heterostructures but also paves the atomic-level structural and interfacial design and the construction of 2D Janus bilayer Z-scheme heterojunctions for solar energy conversion applications.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 59, p. 537-544
Keywords [en]
Vacancy-rich ZnIn2S4 nanosheets, 2D Janus heterostructures, Z-scheme photocatalysts, Charge transfer and separation, Photocatalytic water splitting
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-249776DOI: 10.1016/j.nanoen.2019.03.004ISI: 000463032200058Scopus ID: 2-s2.0-85062657300OAI: oai:DiVA.org:kth-249776DiVA, id: diva2:1307624
Note

QC 20190429

Available from: 2019-04-29 Created: 2019-04-29 Last updated: 2019-04-29Bibliographically approved

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