双II型SnO2@ZnS-ZnSn(OH)6异质结构建内部电场用 于高效光催化NO氧化去除

Translated title of the contribution: Creation of an internal electric field in SnO2@ZnS-ZnSn(OH)6 dual-type-II heterojunctions for efficient NO photo-oxidation

Bangfu Chen, Ping Ouyang, Yuhan Li, Youyu Duan, Kangle Lv, Sónia A. C. Carabineiro, Fan Dong

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Well-designed heterojunction photocatalysts are promising high-performance materials, effective in inducing charge transfer to achieve a particular migration path and long-lasting carriers. However, the traditional binary heterojunction photocatalysts still show low-efficiency charge separation. Herein, we report a direct dual-type-II SnO2@ZnS-ZHS (ZHS = ZnSn(OH)6) ternary heterojunction, obtained by a facile in-situ face-to-face growth approach. Experimental results and density functional theory calculations reveal that the carrier dynamics of SnO2@ZnS-ZHS, with dual-type-II mechanisms, enables the photogenerated holes (h+) of SnO2 to migrate to the valence bands of ZHS and ZnS. This ensures that SnO2@ZnS-ZHS has twice as much oxidizing potential to produce enough hydroxyl radicals (·OH) to participate in NO oxidation reactions. With a unique dual-type-II ternary structure, SnO2@ZnS-ZHS shows the highest NO removal rate (44.5%) after 30 min, which is 23.5, 29.7 and 15.9 times higher than the values shown by the single components ZHS, SnO2 and ZnS, respectively. A reaction mechanism is proposed. The improved photocatalytic activity shows the advantages of the SnO2@ZnS-ZHS heterostructure as a promising candidate for ternary heterojunction design. [Figure not available: see fulltext.].

Translated title of the contributionCreation of an internal electric field in SnO2@ZnS-ZnSn(OH)6 dual-type-II heterojunctions for efficient NO photo-oxidation
Original languageChinese (Traditional)
Pages (from-to)1447-1459
Number of pages13
JournalSCIENCE CHINA Materials
Volume66
Issue number4
Early online dateJan 2023
DOIs
Publication statusPublished - Apr 2023

Keywords

  • internal electric field
  • NO removal
  • ternary heterojunction
  • ZnSn(OH)

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