View in EDS

Improving photocatalytic hydrogen generation of g-C3N4 via efficient charge separation imposed by Bi2O2Se nanosheets.

Saved in:
Bibliographic Details
Title: Improving photocatalytic hydrogen generation of g-C3N4 via efficient charge separation imposed by Bi2O2Se nanosheets.
Authors: Lin, Ci1 (AUTHOR), Zhao, Xiaolong1 (AUTHOR) zhaoxl@hku.hk, Xiao, Yejun2 (AUTHOR), Sattar, Shahid3 (AUTHOR), Tang, Lei4 (AUTHOR), Nairan, Adeela5 (AUTHOR), Guo, Yu1 (AUTHOR), Xia, Mingyu1 (AUTHOR), Canali, Carlo Maria3 (AUTHOR), Khan, Usman1,5 (AUTHOR) usman@zstu.edu.cn, Leung, Dennis Y.C.1 (AUTHOR) ycleung@hku.hk
Source: Carbon. Jan2024, Vol. 218, pN.PAG-N.PAG. 1p.
Subjects: Interstitial hydrogen generation, Nitrides, Nanostructured materials, Quantum efficiency, Photocatalysts, Electron configuration, Hydrogen production, Hydrogen evolution reactions
Abstract: Enabling highly efficient photocatalytic hydrogen production from solar-driven water splitting is of immense potential and environmental significance. However, the crucial issue of the low utilization efficiency of photogenerated charges in most photocatalysts, such as polymeric graphitic carbon nitride, g-C 3 N 4 (CN), hampers the overall photocatalytic activity and hinders practical applications. To surmount this parasitic phenomenon, we develop a heterojunction-based strategy that improves the charge separation efficiency in CN. The heterostructure is constructed between thermally exfoliated CN and liquid phase exfoliated Bi 2 O 2 Se (BOS) via a solution-phase, electrostatically driven self-assembly process. The properly aligned band positions between the two components create a built-in electric field, which endows the composite with an enhanced charge separation efficiency. The optimized Pt-deposited heterostructure photocatalyst exhibits a hydrogen production rate of 6481 μmol h−1 g−1, and an apparent quantum efficiency of 11.65% at 420 nm, compared to those of Pt-deposited ECN (4595 μmol h−1 g−1, 6.64 %). We validate the efficient charge separation effect and the prolonged lifetime of photogenerated carriers in the heterostructure using a series of comprehensive characterizations across multiple timescales, thus, elucidating the origin of the observed photocatalytic activity. This demonstration offers valuable insights into improving the utilization efficiency of photogenerated charges for photocatalysis by heterostructure engineering with materials of distinct electronic configurations. [Display omitted] • A heterostructure composed of thermally exfoliated g-C 3 N 4 and liquid phase exfoliated Bi 2 O 2 Se was facilely obtained via a solution phase self-assembly. • The addition of Bi 2 O 2 Se to g- C 3 N 4 increases the separation efficiency of photogenerated charges. • The 2.5BOS/ECN/Pt composite photocatalyst exhibits a boosted hydrogen generation rate of 6481 μmol h−1 g−1 and an improved apparent quantum efficiency of 11.65% at 420 nm. • Photodynamic measurement indicates effective retardation of the intrinsic recombination of photogenerated charges. [ABSTRACT FROM AUTHOR]
Copyright of Carbon is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 175276684
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Improving photocatalytic hydrogen generation of g-C3N4 via efficient charge separation imposed by Bi2O2Se nanosheets.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Lin%2C+Ci%22">Lin, Ci</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Xiaolong%22">Zhao, Xiaolong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhaoxl@hku.hk</i><br /><searchLink fieldCode="AR" term="%22Xiao%2C+Yejun%22">Xiao, Yejun</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sattar%2C+Shahid%22">Sattar, Shahid</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tang%2C+Lei%22">Tang, Lei</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nairan%2C+Adeela%22">Nairan, Adeela</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guo%2C+Yu%22">Guo, Yu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xia%2C+Mingyu%22">Xia, Mingyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Canali%2C+Carlo+Maria%22">Canali, Carlo Maria</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khan%2C+Usman%22">Khan, Usman</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<i> usman@zstu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Leung%2C+Dennis+Y%2EC%2E%22">Leung, Dennis Y.C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ycleung@hku.hk</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Carbon%22">Carbon</searchLink>. Jan2024, Vol. 218, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Interstitial+hydrogen+generation%22">Interstitial hydrogen generation</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrides%22">Nitrides</searchLink><br /><searchLink fieldCode="DE" term="%22Nanostructured+materials%22">Nanostructured materials</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+efficiency%22">Quantum efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Photocatalysts%22">Photocatalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+configuration%22">Electron configuration</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+production%22">Hydrogen production</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+evolution+reactions%22">Hydrogen evolution reactions</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Enabling highly efficient photocatalytic hydrogen production from solar-driven water splitting is of immense potential and environmental significance. However, the crucial issue of the low utilization efficiency of photogenerated charges in most photocatalysts, such as polymeric graphitic carbon nitride, g-C 3 N 4 (CN), hampers the overall photocatalytic activity and hinders practical applications. To surmount this parasitic phenomenon, we develop a heterojunction-based strategy that improves the charge separation efficiency in CN. The heterostructure is constructed between thermally exfoliated CN and liquid phase exfoliated Bi 2 O 2 Se (BOS) via a solution-phase, electrostatically driven self-assembly process. The properly aligned band positions between the two components create a built-in electric field, which endows the composite with an enhanced charge separation efficiency. The optimized Pt-deposited heterostructure photocatalyst exhibits a hydrogen production rate of 6481 μmol h−1 g−1, and an apparent quantum efficiency of 11.65% at 420 nm, compared to those of Pt-deposited ECN (4595 μmol h−1 g−1, 6.64 %). We validate the efficient charge separation effect and the prolonged lifetime of photogenerated carriers in the heterostructure using a series of comprehensive characterizations across multiple timescales, thus, elucidating the origin of the observed photocatalytic activity. This demonstration offers valuable insights into improving the utilization efficiency of photogenerated charges for photocatalysis by heterostructure engineering with materials of distinct electronic configurations. [Display omitted] • A heterostructure composed of thermally exfoliated g-C 3 N 4 and liquid phase exfoliated Bi 2 O 2 Se was facilely obtained via a solution phase self-assembly. • The addition of Bi 2 O 2 Se to g- C 3 N 4 increases the separation efficiency of photogenerated charges. • The 2.5BOS/ECN/Pt composite photocatalyst exhibits a boosted hydrogen generation rate of 6481 μmol h−1 g−1 and an improved apparent quantum efficiency of 11.65% at 420 nm. • Photodynamic measurement indicates effective retardation of the intrinsic recombination of photogenerated charges. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Carbon is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=175276684
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.carbon.2023.118721
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Interstitial hydrogen generation
        Type: general
      – SubjectFull: Nitrides
        Type: general
      – SubjectFull: Nanostructured materials
        Type: general
      – SubjectFull: Quantum efficiency
        Type: general
      – SubjectFull: Photocatalysts
        Type: general
      – SubjectFull: Electron configuration
        Type: general
      – SubjectFull: Hydrogen production
        Type: general
      – SubjectFull: Hydrogen evolution reactions
        Type: general
    Titles:
      – TitleFull: Improving photocatalytic hydrogen generation of g-C3N4 via efficient charge separation imposed by Bi2O2Se nanosheets.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Lin, Ci
      – PersonEntity:
          Name:
            NameFull: Zhao, Xiaolong
      – PersonEntity:
          Name:
            NameFull: Xiao, Yejun
      – PersonEntity:
          Name:
            NameFull: Sattar, Shahid
      – PersonEntity:
          Name:
            NameFull: Tang, Lei
      – PersonEntity:
          Name:
            NameFull: Nairan, Adeela
      – PersonEntity:
          Name:
            NameFull: Guo, Yu
      – PersonEntity:
          Name:
            NameFull: Xia, Mingyu
      – PersonEntity:
          Name:
            NameFull: Canali, Carlo Maria
      – PersonEntity:
          Name:
            NameFull: Khan, Usman
      – PersonEntity:
          Name:
            NameFull: Leung, Dennis Y.C.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 31
              M: 01
              Text: Jan2024
              Type: published
              Y: 2024
          Identifiers:
            – Type: issn-print
              Value: 00086223
          Numbering:
            – Type: volume
              Value: 218
          Titles:
            – TitleFull: Carbon
              Type: main
ResultId 1