Jan 23, 2016

Aluminum Nanocrystals as a Plasmonic Photocatalyst for Hydrogen Dissociation

Nano Letters
Linan ZhouN J Halas

Abstract

Hydrogen dissociation is a critical step in many hydrogenation reactions central to industrial chemical production and pollutant removal. This step typically utilizes the favorable band structure of precious metal catalysts like platinum and palladium to achieve high efficiency under mild conditions. Here we demonstrate that aluminum nanocrystals (Al NCs), when illuminated, can be used as a photocatalyst for hydrogen dissociation at room temperature and atmospheric pressure, despite the high activation barrier toward hydrogen adsorption and dissociation. We show that hot electron transfer from Al NCs to the antibonding orbitals of hydrogen molecules facilitates their dissociation. Hot electrons generated from surface plasmon decay and from direct photoexcitation of the interband transitions of Al both contribute to this process. Our results pave the way for the use of aluminum, an earth-abundant, nonprecious metal, for photocatalysis.

  • References28
  • Citations30

References

Mentioned in this Paper

Aluminum Measurement
Electron Transport
Hydrogen
Metals
Adsorption
Orbit (brand of fungicide)
Electron Microscopy
Structure
Chemicals
Pollutant

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