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Facile fabrication of AgBr/HCCN hybrids with Z-scheme heterojunction for efficient photocatalytic hydrogen evolution
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. Fuzhou Univ, Coll Chem, Fuzhou 350116, Peoples R China..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0001-6717-0408
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Solid State Physics. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. Newcastle Univ, Sch Nat & Environm Sci, Energy Mat Lab, Newcastle Upon Tyne NE1 7RU, England..ORCID iD: 0000-0003-2759-7356
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2024 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 651, article id 159292Article in journal (Refereed) Published
Abstract [en]

Constructing a Z-scheme heterojunction with enhanced photocatalytic hydrogen evolution for graphitic carbon nitride-based (g-C3N4) composites is challenging because integrating g-C3N4 with other semiconductors, without specific band structure design, typically results in type I or type II heterojunctions. These heterojunctions have lower redox ability and limited enhancement in photocatalysis. Herein, we select highly crystalline carbon nitride (HCCN) as a proof-of-concept substrate. For the first time, we develop a AgBr nanosphere/HCCN composite photocatalyst that features an all -solid -state direct Z-scheme heterojunction for visible-light photocatalytic hydrogen evolution. The electron transfer mechanism is initially studied from the band structures and Fermi levels of HCCN and AgBr. It is subsequently confirmed by X-ray photoelectron spectroscopy (XPS), and electron microscopy. The close heterojunction contact and the built-in electron field of the Z-scheme heterojunction promote the migration and separation of photogenerated electrons and holes in the composite photocatalyst. Due to the redistribution of charge carriers, the photocatalyst shows superior redox capability and a markedly enhanced hydrogen evolution performance compared to its individual components. Combining all the advantages, AgBr nanosphere/HCCN reached an apparent quantum efficiency (AQE) of 6 % under the illumination of 410 nm, which is 4 times higher than that of the single HCCN component.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 651, article id 159292
Keywords [en]
Highly crystalline carbon nitride, AgBr nanosphere, Z-scheme heterojunction, Photocatalysis, Hydrogen production
National Category
Physical Chemistry Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-522891DOI: 10.1016/j.apsusc.2024.159292ISI: 001152746800001OAI: oai:DiVA.org:uu-522891DiVA, id: diva2:1836916
Funder
Swedish Energy Agency, 46641-1Olle Engkvists stiftelse, SOEB-2015/167Available from: 2024-02-12 Created: 2024-02-12 Last updated: 2024-02-12Bibliographically approved

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Sun, WenhaoAhmed, TahaElbouazzaoui, KenzaEdvinsson, TomasZhu, Jiefang

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