Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls

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Authors

  • Barbara N. Nunes
  • Christoph Haisch
  • Alexei V. Emeline
  • Detlef Bahnemann
  • Antonio Octavio T. Patrocinio

Research Organisations

External Research Organisations

  • Universidade Federal de Uberlandia
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Details

Original languageEnglish
Pages (from-to)60-67
Number of pages8
JournalCatalysis Today
Volume326
Early online date26 Jun 2018
Publication statusPublished - 1 Apr 2019

Abstract

High efficient photocatalytic surfaces were obtained through the layer-by-layer (LbL) deposition of hexaniobate nanoscrolls on conductive glasses. These films were deposited by alternative immersions of the substrate into exfoliated hexaniobated suspensions (pH = 8) and poly(allylamine hydrochloride) solutions (pH = 4). The organic species were further removed by thermal treatment leading to a fuzzy assembly of hexaniobate nanoscrolls. Pre-adsorption of [Pt(NH 3 ) 4 ] 2+ cations on the niobate layers allows the production of metallic Pt nanoclusters on the film layers. The Pt-modified films exhibited apparent quantum yields of (4.0 ± 0.5) % for H 2 evolution from water/methanol mixtures under UV-A irraditation. The H 2 evolution rates varied linearly with the number of deposited bilayers, indicating that no active sites are lost as the film is grown. The photoelectrochemical properties of the films reveal that the small size of the hole scavenger and its easy diffusion into the hexaniobate layers are key aspects for the photocatalytic activity. In the absence of alcohols as hole scavengers, irradiation of the hexaniobate LbL films in aqueous solutions leads to the production of surface-bound peroxides that limit the photocatalytic water splitting ability of these materials. The results presented here provide evidence for the effectiveness of the LbL technique to deposit thin films of layered materials retaining their interesting adsorption chemistry. This methodology can be further employed for the development of highly active photocatalytic surfaces.

Keywords

    Hexaniobate-based photocatalysts, Metal oxide LbL films, Photoactive surface

ASJC Scopus subject areas

Sustainable Development Goals

Cite this

Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls. / Nunes, Barbara N.; Haisch, Christoph; Emeline, Alexei V. et al.
In: Catalysis Today, Vol. 326, 01.04.2019, p. 60-67.

Research output: Contribution to journalArticleResearchpeer review

Nunes, BN, Haisch, C, Emeline, AV, Bahnemann, D & Patrocinio, AOT 2019, 'Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls', Catalysis Today, vol. 326, pp. 60-67. https://doi.org/10.1016/j.cattod.2018.06.029
Nunes, B. N., Haisch, C., Emeline, A. V., Bahnemann, D., & Patrocinio, A. O. T. (2019). Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls. Catalysis Today, 326, 60-67. https://doi.org/10.1016/j.cattod.2018.06.029
Nunes BN, Haisch C, Emeline AV, Bahnemann D, Patrocinio AOT. Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls. Catalysis Today. 2019 Apr 1;326:60-67. Epub 2018 Jun 26. doi: 10.1016/j.cattod.2018.06.029
Nunes, Barbara N. ; Haisch, Christoph ; Emeline, Alexei V. et al. / Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls. In: Catalysis Today. 2019 ; Vol. 326. pp. 60-67.
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title = "Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls",
abstract = "High efficient photocatalytic surfaces were obtained through the layer-by-layer (LbL) deposition of hexaniobate nanoscrolls on conductive glasses. These films were deposited by alternative immersions of the substrate into exfoliated hexaniobated suspensions (pH = 8) and poly(allylamine hydrochloride) solutions (pH = 4). The organic species were further removed by thermal treatment leading to a fuzzy assembly of hexaniobate nanoscrolls. Pre-adsorption of [Pt(NH 3 ) 4 ] 2+ cations on the niobate layers allows the production of metallic Pt nanoclusters on the film layers. The Pt-modified films exhibited apparent quantum yields of (4.0 ± 0.5) % for H 2 evolution from water/methanol mixtures under UV-A irraditation. The H 2 evolution rates varied linearly with the number of deposited bilayers, indicating that no active sites are lost as the film is grown. The photoelectrochemical properties of the films reveal that the small size of the hole scavenger and its easy diffusion into the hexaniobate layers are key aspects for the photocatalytic activity. In the absence of alcohols as hole scavengers, irradiation of the hexaniobate LbL films in aqueous solutions leads to the production of surface-bound peroxides that limit the photocatalytic water splitting ability of these materials. The results presented here provide evidence for the effectiveness of the LbL technique to deposit thin films of layered materials retaining their interesting adsorption chemistry. This methodology can be further employed for the development of highly active photocatalytic surfaces. ",
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author = "Nunes, {Barbara N.} and Christoph Haisch and Emeline, {Alexei V.} and Detlef Bahnemann and Patrocinio, {Antonio Octavio T.}",
note = "Funding information: In Brazil, this work was supported by Funda{\c c}{\~a}o de Amparo {\`a} Pesquisa do Estado de Minas Gerais (FAPEMIG, PPM-00220-17), Conselho Nacional de Desenvolvimento Cient{\'i}fico e Tecnol{\'o}gico (CNPq) and Coordena{\c c}{\~a}o de Aperfei{\c c}oamento de Pessoal de N{\'i}vel Superior (CAPES). The authors are also thankful to the Grupo de Materiais Inorg{\^a}nicos do Tri{\^a}ngulo (GMIT), a research group supported by FAPEMIG (APQ-00330-14) and to CBMM for the Nb In Brazil, this work was supported by Funda{\c c}{\~a}o de Amparo {\`a} Pesquisa do Estado de Minas Gerais (FAPEMIG, PPM-00220-17 ), Conselho Nacional de Desenvolvimento Cient{\'i}fico e Tecnol{\'o}gico (CNPq) and Coordena{\c c}{\~a}o de Aperfei{\c c}oamento de Pessoal de N{\'i}vel Superior (CAPES) . The authors are also thankful to the Grupo de Materiais Inorg{\^a}nicos do Tri{\^a}ngulo (GMIT), a research group supported by FAPEMIG (APQ-00330-14) and to CBMM for the Nb 2 O 5 . A.O.T.P. is thankful to Alexander Von Humboldt Foundation for the fellowship in Germany. Also in Germany, The financial support from the Federal Ministry of Education and Research BMBF (Project “DuaSol” No. 03SF0482C and 03SF0482) is gratefully acknowledged. The present study was performed within the Project Establishment of the Laboratory “Photoactive Nanocomposite Materials ” No. 14.Z50.31.0016 supported by a Mega-grant of the Government of the Russian Federation .",
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T1 - Photocatalytic properties of layer-by-layer thin films of hexaniobate nanoscrolls

AU - Nunes, Barbara N.

AU - Haisch, Christoph

AU - Emeline, Alexei V.

AU - Bahnemann, Detlef

AU - Patrocinio, Antonio Octavio T.

N1 - Funding information: In Brazil, this work was supported by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, PPM-00220-17), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). The authors are also thankful to the Grupo de Materiais Inorgânicos do Triângulo (GMIT), a research group supported by FAPEMIG (APQ-00330-14) and to CBMM for the Nb In Brazil, this work was supported by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, PPM-00220-17 ), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) . The authors are also thankful to the Grupo de Materiais Inorgânicos do Triângulo (GMIT), a research group supported by FAPEMIG (APQ-00330-14) and to CBMM for the Nb 2 O 5 . A.O.T.P. is thankful to Alexander Von Humboldt Foundation for the fellowship in Germany. Also in Germany, The financial support from the Federal Ministry of Education and Research BMBF (Project “DuaSol” No. 03SF0482C and 03SF0482) is gratefully acknowledged. The present study was performed within the Project Establishment of the Laboratory “Photoactive Nanocomposite Materials ” No. 14.Z50.31.0016 supported by a Mega-grant of the Government of the Russian Federation .

PY - 2019/4/1

Y1 - 2019/4/1

N2 - High efficient photocatalytic surfaces were obtained through the layer-by-layer (LbL) deposition of hexaniobate nanoscrolls on conductive glasses. These films were deposited by alternative immersions of the substrate into exfoliated hexaniobated suspensions (pH = 8) and poly(allylamine hydrochloride) solutions (pH = 4). The organic species were further removed by thermal treatment leading to a fuzzy assembly of hexaniobate nanoscrolls. Pre-adsorption of [Pt(NH 3 ) 4 ] 2+ cations on the niobate layers allows the production of metallic Pt nanoclusters on the film layers. The Pt-modified films exhibited apparent quantum yields of (4.0 ± 0.5) % for H 2 evolution from water/methanol mixtures under UV-A irraditation. The H 2 evolution rates varied linearly with the number of deposited bilayers, indicating that no active sites are lost as the film is grown. The photoelectrochemical properties of the films reveal that the small size of the hole scavenger and its easy diffusion into the hexaniobate layers are key aspects for the photocatalytic activity. In the absence of alcohols as hole scavengers, irradiation of the hexaniobate LbL films in aqueous solutions leads to the production of surface-bound peroxides that limit the photocatalytic water splitting ability of these materials. The results presented here provide evidence for the effectiveness of the LbL technique to deposit thin films of layered materials retaining their interesting adsorption chemistry. This methodology can be further employed for the development of highly active photocatalytic surfaces.

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KW - Hexaniobate-based photocatalysts

KW - Metal oxide LbL films

KW - Photoactive surface

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