Oriented Films of Conjugated 2D Covalent Organic Frameworks as Photocathodes for Water Splitting

Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is limited by the performance of available photoabsorbers. Here we report the first time investigation of covalent organic frameworks (COFs) as a new...

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Published inJournal of the American Chemical Society Vol. 140; no. 6; pp. 2085 - 2092
Main Authors Sick, Torben, Hufnagel, Alexander G, Kampmann, Jonathan, Kondofersky, Ilina, Calik, Mona, Rotter, Julian M, Evans, Austin, Döblinger, Markus, Herbert, Simon, Peters, Kristina, Böhm, Daniel, Knochel, Paul, Medina, Dana D, Fattakhova-Rohlfing, Dina, Bein, Thomas
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 14.02.2018
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Abstract Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is limited by the performance of available photoabsorbers. Here we report the first time investigation of covalent organic frameworks (COFs) as a new class of photoelectrodes. The presented 2D-COF structure is assembled from aromatic amine-functionalized tetraphenylethylene and thiophene-based dialdehyde building blocks to form conjugated polyimine sheets, which π-stack in the third dimension to create photoactive porous frameworks. Highly oriented COF films absorb light in the visible range to generate photoexcited electrons that diffuse to the surface and are transferred to the electrolyte, resulting in proton reduction and hydrogen evolution. The observed photoelectrochemical activity of the 2D-COF films and their photocorrosion stability in water pave the way for a novel class of photoabsorber materials with versatile optical and electronic properties that are tunable through the selection of appropriate building blocks and their three-dimensional stacking.
AbstractList Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is limited by the performance of available photoabsorbers. Here we report the first time investigation of covalent organic frameworks (COFs) as a new class of photoelectrodes. The presented 2D-COF structure is assembled from aromatic amine-functionalized tetraphenylethylene and thiophene-based dialdehyde building blocks to form conjugated polyimine sheets, which π-stack in the third dimension to create photoactive porous frameworks. Highly oriented COF films absorb light in the visible range to generate photoexcited electrons that diffuse to the surface and are transferred to the electrolyte, resulting in proton reduction and hydrogen evolution. The observed photoelectrochemical activity of the 2D-COF films and their photocorrosion stability in water pave the way for a novel class of photoabsorber materials with versatile optical and electronic properties that are tunable through the selection of appropriate building blocks and their three-dimensional stacking.Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is limited by the performance of available photoabsorbers. Here we report the first time investigation of covalent organic frameworks (COFs) as a new class of photoelectrodes. The presented 2D-COF structure is assembled from aromatic amine-functionalized tetraphenylethylene and thiophene-based dialdehyde building blocks to form conjugated polyimine sheets, which π-stack in the third dimension to create photoactive porous frameworks. Highly oriented COF films absorb light in the visible range to generate photoexcited electrons that diffuse to the surface and are transferred to the electrolyte, resulting in proton reduction and hydrogen evolution. The observed photoelectrochemical activity of the 2D-COF films and their photocorrosion stability in water pave the way for a novel class of photoabsorber materials with versatile optical and electronic properties that are tunable through the selection of appropriate building blocks and their three-dimensional stacking.
Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is limited by the performance of available photoabsorbers. Here we report the first time investigation of covalent organic frameworks (COFs) as a new class of photoelectrodes. The presented 2D-COF structure is assembled from aromatic amine-functionalized tetraphenylethylene and thiophene-based dialdehyde building blocks to form conjugated polyimine sheets, which π-stack in the third dimension to create photoactive porous frameworks. Highly oriented COF films absorb light in the visible range to generate photoexcited electrons that diffuse to the surface and are transferred to the electrolyte, resulting in proton reduction and hydrogen evolution. The observed photoelectrochemical activity of the 2D-COF films and their photocorrosion stability in water pave the way for a novel class of photoabsorber materials with versatile optical and electronic properties that are tunable through the selection of appropriate building blocks and their three-dimensional stacking.
Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is limited by the performance of available photoabsorbers. Here we report the first time investigation of covalent organic frameworks (COFs) as a new class of photoelectrodes. The presented 2D-COF structure is assembled from aromatic amine-functionalized tetraphenylethylene and thiophene-based dialdehyde building blocks to form conjugated polyimine sheets, which π-stack in the third dimension to create photoactive porous frameworks. Highly oriented COF films absorb light in the visible range to generate photoexcited electrons that diffuse to the surface and are transferred to the electrolyte, resulting in proton reduction and hydrogen evolution. The observed photoelectrochemical activity of the 2D-COF films and their photocorrosion stability in water pave the way for a novel class of photoabsorber materials with versatile optical and electronic properties that are tunable through the selection of appropriate building blocks and their three-dimensional stacking.
Author Hufnagel, Alexander G
Kampmann, Jonathan
Rotter, Julian M
Peters, Kristina
Böhm, Daniel
Sick, Torben
Herbert, Simon
Bein, Thomas
Döblinger, Markus
Evans, Austin
Calik, Mona
Fattakhova-Rohlfing, Dina
Medina, Dana D
Kondofersky, Ilina
Knochel, Paul
AuthorAffiliation University of Munich (LMU)
Forschungszentrum Jülich GmbH
University of Duisburg-Essen
Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE)
Department of Chemistry and Center for NanoScience (CeNS)
Institute of Energy and Climate Research (IEK-1) Materials Synthesis and Processing
AuthorAffiliation_xml – name: University of Duisburg-Essen
– name: Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE)
– name: Institute of Energy and Climate Research (IEK-1) Materials Synthesis and Processing
– name: Forschungszentrum Jülich GmbH
– name: Department of Chemistry and Center for NanoScience (CeNS)
– name: University of Munich (LMU)
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  givenname: Torben
  orcidid: 0000-0003-4684-7971
  surname: Sick
  fullname: Sick, Torben
  organization: University of Munich (LMU)
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  givenname: Alexander G
  orcidid: 0000-0003-4088-937X
  surname: Hufnagel
  fullname: Hufnagel, Alexander G
  organization: University of Munich (LMU)
– sequence: 3
  givenname: Jonathan
  surname: Kampmann
  fullname: Kampmann, Jonathan
  organization: University of Munich (LMU)
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  surname: Kondofersky
  fullname: Kondofersky, Ilina
  organization: University of Munich (LMU)
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  surname: Calik
  fullname: Calik, Mona
  organization: University of Munich (LMU)
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  organization: University of Munich (LMU)
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  surname: Evans
  fullname: Evans, Austin
  organization: University of Munich (LMU)
– sequence: 8
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  surname: Döblinger
  fullname: Döblinger, Markus
  organization: University of Munich (LMU)
– sequence: 9
  givenname: Simon
  surname: Herbert
  fullname: Herbert, Simon
  organization: University of Munich (LMU)
– sequence: 10
  givenname: Kristina
  surname: Peters
  fullname: Peters, Kristina
  organization: University of Munich (LMU)
– sequence: 11
  givenname: Daniel
  surname: Böhm
  fullname: Böhm, Daniel
  organization: University of Munich (LMU)
– sequence: 12
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  orcidid: 0000-0001-7913-4332
  surname: Knochel
  fullname: Knochel, Paul
  organization: University of Munich (LMU)
– sequence: 13
  givenname: Dana D
  orcidid: 0000-0003-4759-8612
  surname: Medina
  fullname: Medina, Dana D
  organization: University of Munich (LMU)
– sequence: 14
  givenname: Dina
  orcidid: 0000-0003-2008-0151
  surname: Fattakhova-Rohlfing
  fullname: Fattakhova-Rohlfing, Dina
  email: d.fattakhova@fz-juelich.de
  organization: University of Duisburg-Essen
– sequence: 15
  givenname: Thomas
  orcidid: 0000-0001-7248-5906
  surname: Bein
  fullname: Bein, Thomas
  email: bein@lmu.de
  organization: University of Munich (LMU)
BackLink https://www.ncbi.nlm.nih.gov/pubmed/29249151$$D View this record in MEDLINE/PubMed
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Snippet Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is...
Light-driven water electrolysis at a semiconductor surface is a promising way to generate hydrogen from sustainable energy sources, but its efficiency is...
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SubjectTerms cathodes
electrolysis
electrolytes
electrons
hydrogen
hydrogen production
renewable energy sources
semiconductors
Title Oriented Films of Conjugated 2D Covalent Organic Frameworks as Photocathodes for Water Splitting
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