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Enhancing the hydrogen generation of TiO2 nanoparticles by decorating its surface with BiI3 and PbI2 quantum dots.

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Title: Enhancing the hydrogen generation of TiO2 nanoparticles by decorating its surface with BiI3 and PbI2 quantum dots.
Authors: Oliva, J.1 (AUTHOR), Gomez-Solis, C.1,2 (AUTHOR) gomez.c@ugto.mx, Pinedo Escobar, J.A.3 (AUTHOR), Vallejo, M.A.2 (AUTHOR), Garcia de la Cruz, D.4 (AUTHOR), Garcia, C.R.5 (AUTHOR), Puentes-Prado, E.6 (AUTHOR)
Source: International Journal of Hydrogen Energy. Feb2021, Vol. 46 Issue 11, p7926-7938. 13p.
Subjects: Interstitial hydrogen generation, Quantum dots, Electron-hole recombination, Platinum nanoparticles, Conduction bands, Conduction electrons, Hydrogen storage, Photoluminescence measurement
Abstract: This work reports the performance of TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites for hydrogen generation. BiI 3 and PbI 2 quantum dots (QDs) were grown on TiO 2 (P25 Degussa) using a fast injection method. According to the analysis by X-ray diffraction, the nanocomposites have a mixture of anatase, rutile and cubic phases from TiO 2 , BiI 3 and PbI 2. The images obtained from transmission electron microscopy revealed that the TiO 2 support have sizes in the range of 70–220 nm while the QDs of BiI 3 and PbI 2 (co-catalysts) grown on TiO 2 have sizes in the range of 12–17 nm. The presence of these iodides on TiO 2 created oxygen vacancies defects (confirmed by photoluminescence measurements) that extended the light absorption of TiO 2 from the UV to the VIS range. According to the results from the photocatalytic experiments for hydrogen generation (achieved using pure water and UV-VIS light), the hydrogen generation rates produced by the TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites were 437–580 times, 81–108 times and 21–30 times, higher than these for pure TiO 2 , PbI 2 and BiI 3 , respectively. The maximum hydrogen generation rates of the TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites were 290.7 and 219.2 μmol h−1 g−1, respectively. In addition, the TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites contained defects that acted as electron trapping centers, which in turn, delayed the electron-hole recombination and this favored the photocatalytic generation of H 2. Moreover, the heterojunction formed between the TiO 2 and the iodides allowed the transfer of electrons from the conduction band of TiO 2 toward the conduction band of the iodides, creating a "sink" for the electrons which delayed the electron hole recombination. The results presented here demonstrated that the deposition of iodide co-catalyst on TiO 2 is a feasible option to enhance the hydrogen generation. Image 1 • TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites were synthesized by a fast injection method. • BiI 3 and PbI 2 QDs enhanced the hydrogen generation of TiO 2 by 437–580 times. • Defects on TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites improved the H 2 production. • The interface TiO 2 /iodides created a sink, delaying the e-h recombination. • The H 2 production was 290.7 and 219.2 μmol h−1 g−1 for TiO 2 /BiI 3 and TiO 2 /PbI 2. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science 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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  Label: Title
  Group: Ti
  Data: Enhancing the hydrogen generation of TiO2 nanoparticles by decorating its surface with BiI3 and PbI2 quantum dots.
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  Data: <searchLink fieldCode="AR" term="%22Oliva%2C+J%2E%22">Oliva, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gomez-Solis%2C+C%2E%22">Gomez-Solis, C.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> gomez.c@ugto.mx</i><br /><searchLink fieldCode="AR" term="%22Pinedo+Escobar%2C+J%2EA%2E%22">Pinedo Escobar, J.A.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vallejo%2C+M%2EA%2E%22">Vallejo, M.A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Garcia+de+la+Cruz%2C+D%2E%22">Garcia de la Cruz, D.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Garcia%2C+C%2ER%2E%22">Garcia, C.R.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Puentes-Prado%2C+E%2E%22">Puentes-Prado, E.</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Hydrogen+Energy%22">International Journal of Hydrogen Energy</searchLink>. Feb2021, Vol. 46 Issue 11, p7926-7938. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Interstitial+hydrogen+generation%22">Interstitial hydrogen generation</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+dots%22">Quantum dots</searchLink><br /><searchLink fieldCode="DE" term="%22Electron-hole+recombination%22">Electron-hole recombination</searchLink><br /><searchLink fieldCode="DE" term="%22Platinum+nanoparticles%22">Platinum nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Conduction+bands%22">Conduction bands</searchLink><br /><searchLink fieldCode="DE" term="%22Conduction+electrons%22">Conduction electrons</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+storage%22">Hydrogen storage</searchLink><br /><searchLink fieldCode="DE" term="%22Photoluminescence+measurement%22">Photoluminescence measurement</searchLink>
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  Label: Abstract
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  Data: This work reports the performance of TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites for hydrogen generation. BiI 3 and PbI 2 quantum dots (QDs) were grown on TiO 2 (P25 Degussa) using a fast injection method. According to the analysis by X-ray diffraction, the nanocomposites have a mixture of anatase, rutile and cubic phases from TiO 2 , BiI 3 and PbI 2. The images obtained from transmission electron microscopy revealed that the TiO 2 support have sizes in the range of 70–220 nm while the QDs of BiI 3 and PbI 2 (co-catalysts) grown on TiO 2 have sizes in the range of 12–17 nm. The presence of these iodides on TiO 2 created oxygen vacancies defects (confirmed by photoluminescence measurements) that extended the light absorption of TiO 2 from the UV to the VIS range. According to the results from the photocatalytic experiments for hydrogen generation (achieved using pure water and UV-VIS light), the hydrogen generation rates produced by the TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites were 437–580 times, 81–108 times and 21–30 times, higher than these for pure TiO 2 , PbI 2 and BiI 3 , respectively. The maximum hydrogen generation rates of the TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites were 290.7 and 219.2 μmol h−1 g−1, respectively. In addition, the TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites contained defects that acted as electron trapping centers, which in turn, delayed the electron-hole recombination and this favored the photocatalytic generation of H 2. Moreover, the heterojunction formed between the TiO 2 and the iodides allowed the transfer of electrons from the conduction band of TiO 2 toward the conduction band of the iodides, creating a "sink" for the electrons which delayed the electron hole recombination. The results presented here demonstrated that the deposition of iodide co-catalyst on TiO 2 is a feasible option to enhance the hydrogen generation. Image 1 • TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites were synthesized by a fast injection method. • BiI 3 and PbI 2 QDs enhanced the hydrogen generation of TiO 2 by 437–580 times. • Defects on TiO 2 /BiI 3 and TiO 2 /PbI 2 nanocomposites improved the H 2 production. • The interface TiO 2 /iodides created a sink, delaying the e-h recombination. • The H 2 production was 290.7 and 219.2 μmol h−1 g−1 for TiO 2 /BiI 3 and TiO 2 /PbI 2. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science 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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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijhydene.2020.12.027
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 7926
    Subjects:
      – SubjectFull: Interstitial hydrogen generation
        Type: general
      – SubjectFull: Quantum dots
        Type: general
      – SubjectFull: Electron-hole recombination
        Type: general
      – SubjectFull: Platinum nanoparticles
        Type: general
      – SubjectFull: Conduction bands
        Type: general
      – SubjectFull: Conduction electrons
        Type: general
      – SubjectFull: Hydrogen storage
        Type: general
      – SubjectFull: Photoluminescence measurement
        Type: general
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      – TitleFull: Enhancing the hydrogen generation of TiO2 nanoparticles by decorating its surface with BiI3 and PbI2 quantum dots.
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              Text: Feb2021
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              Y: 2021
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