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Water Splitting Induced by Visible Light at a Copper-Based Single-Molecule Junction.

Risa Fukuzumi1, Marius Buerkle2, Yu Li1

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Small (Weinheim an Der Bergstrasse, Germany)
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Copper-based single-molecule junctions facilitate water splitting into hydrogen using light. Localized surface plasmons on copper catalysts drive this photocatalytic process at the molecular level.

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copper nanostructureinelastic electron tunneling spectroscopylocalized surface plasmonsingle-molecule junctionwater splitting

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Water splitting is crucial for producing hydrogen fuel from light energy.
  • Copper-based materials are promising, environmentally friendly catalysts for water splitting.
  • Enhancing water-splitting efficiency requires advanced reaction processes.

Purpose of the Study:

  • To investigate water splitting at copper-based single-molecule junctions (SMJs).
  • To characterize hydrogen production at the single-molecule scale.
  • To understand the role of localized surface plasmons in photocatalysis.

Main Methods:

  • Utilized electron transport measurements on copper-based SMJs.
  • Employed inelastic electron tunneling spectroscopy (IETS) and first-principles calculations.
  • Conducted time-dependent and wavelength-dependent measurements under visible light irradiation.

Main Results:

  • Observed distinct conductance states corresponding to Cu/hydrogen molecule/Cu junctions after irradiation.
  • Confirmed water molecule decomposition and hydrogen production via IETS and calculations.
  • Demonstrated that localized surface plasmons are responsible for water molecule dissociation.

Conclusions:

  • Copper-based SMJs can induce and characterize water splitting at the single-molecule level.
  • Localized surface plasmons play a key role in the photocatalytic activity of copper.
  • These findings highlight the potential of copper-based materials for efficient photocatalysis.