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Tuning CH4 Productivity from Visible Light‐Driven Gas‐Phase CO2 Photocatalytic Reduction on Doped g‐C3N4/TiO2 Heterojunctions.

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Title: Tuning CH4 Productivity from Visible Light‐Driven Gas‐Phase CO2 Photocatalytic Reduction on Doped g‐C3N4/TiO2 Heterojunctions.
Authors: Hammoud, Leila1 (AUTHOR), Marchal, Clément1 (AUTHOR), Colbeau-Justin, Christophe2 (AUTHOR), Toufaily, Joumana3 (AUTHOR), Hamieh, Tayssir3,4 (AUTHOR), Caps, Valérie1 (AUTHOR), Keller, Valérie1 (AUTHOR) vkeller@unistra.fr
Source: Energy Technology. Oct2023, Vol. 11 Issue 10, p1-11. 11p.
Subject Terms: Photoreduction, Visible spectra, Gold nanoparticles, Electron traps, Conduction bands, Reducing agents
Abstract: Herein, visible light‐driven gas‐phase photocatalytic CO2 reduction into CH4 is tuned by designing optimized three‐component Au/doped C3N4/TiO2 composite photocatalysts. The key point strategy consists in the formation of high‐quality C3N4/TiO2 heterojunction by associating low containing doped graphitic carbon nitride to commercially available TiO2 UV‐100. Those heterojunctions result in both visible light sensitization and increased charge‐carrier separation. Further deposition of small Au nanoparticles (≈3 nm), quite exclusively onto TiO2 surfaces, mainly acts as electron trapping/cocatalytic functions without excluding surface plasmonic effects. The resulting doped g‐C3N4 material exhibits enhanced visible light harvesting properties, especially in the case of C‐doping. In addition, it is assumed that B– and C–C3N4 doping, leading to a more or less lower conduction band position, is the impacting factor toward total CH4 selectivity achievement. The (0.77 wt%)Au/(0.59 wt%)C–C3N4/TiO2 composite photocatalyst, exhibiting the best compromise between the various impacting factors, leads to a continuous productivity rate of CH4 of 8.5 μmol h−1 g−1 under visible light irradiation over at least 10 h. To the best of knowledge, this level of performance is unprecedented under continuous gas‐phase flowing CO2 in the presence of water as reducing agent, without addition of any sacrificial agent. [ABSTRACT FROM AUTHOR]
Copyright of Energy Technology is the property of Wiley-Blackwell 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.)
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  Data: Tuning CH<subscript>4</subscript> Productivity from Visible Light‐Driven Gas‐Phase CO<subscript>2</subscript> Photocatalytic Reduction on Doped g‐C<subscript>3</subscript>N<subscript>4</subscript>/TiO<subscript>2</subscript> Heterojunctions.
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  Data: <searchLink fieldCode="JN" term="%22Energy+Technology%22">Energy Technology</searchLink>. Oct2023, Vol. 11 Issue 10, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Photoreduction%22">Photoreduction</searchLink><br /><searchLink fieldCode="DE" term="%22Visible+spectra%22">Visible spectra</searchLink><br /><searchLink fieldCode="DE" term="%22Gold+nanoparticles%22">Gold nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+traps%22">Electron traps</searchLink><br /><searchLink fieldCode="DE" term="%22Conduction+bands%22">Conduction bands</searchLink><br /><searchLink fieldCode="DE" term="%22Reducing+agents%22">Reducing agents</searchLink>
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  Data: Herein, visible light‐driven gas‐phase photocatalytic CO2 reduction into CH4 is tuned by designing optimized three‐component Au/doped C3N4/TiO2 composite photocatalysts. The key point strategy consists in the formation of high‐quality C3N4/TiO2 heterojunction by associating low containing doped graphitic carbon nitride to commercially available TiO2 UV‐100. Those heterojunctions result in both visible light sensitization and increased charge‐carrier separation. Further deposition of small Au nanoparticles (≈3 nm), quite exclusively onto TiO2 surfaces, mainly acts as electron trapping/cocatalytic functions without excluding surface plasmonic effects. The resulting doped g‐C3N4 material exhibits enhanced visible light harvesting properties, especially in the case of C‐doping. In addition, it is assumed that B– and C–C3N4 doping, leading to a more or less lower conduction band position, is the impacting factor toward total CH4 selectivity achievement. The (0.77 wt%)Au/(0.59 wt%)C–C3N4/TiO2 composite photocatalyst, exhibiting the best compromise between the various impacting factors, leads to a continuous productivity rate of CH4 of 8.5 μmol h−1 g−1 under visible light irradiation over at least 10 h. To the best of knowledge, this level of performance is unprecedented under continuous gas‐phase flowing CO2 in the presence of water as reducing agent, without addition of any sacrificial agent. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Energy Technology is the property of Wiley-Blackwell 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.)
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        Value: 10.1002/ente.202201363
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      – Code: eng
        Text: English
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      – SubjectFull: Photoreduction
        Type: general
      – SubjectFull: Visible spectra
        Type: general
      – SubjectFull: Gold nanoparticles
        Type: general
      – SubjectFull: Electron traps
        Type: general
      – SubjectFull: Conduction bands
        Type: general
      – SubjectFull: Reducing agents
        Type: general
    Titles:
      – TitleFull: Tuning CH4 Productivity from Visible Light‐Driven Gas‐Phase CO2 Photocatalytic Reduction on Doped g‐C3N4/TiO2 Heterojunctions.
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            NameFull: Hammoud, Leila
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            NameFull: Marchal, Clément
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            NameFull: Toufaily, Joumana
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            NameFull: Hamieh, Tayssir
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            – D: 01
              M: 10
              Text: Oct2023
              Type: published
              Y: 2023
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