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Hydrogen migration dynamics in hydrated Al clusters: the Al17(-)·H2O system as an example.

S Álvarez-Barcia1, J R Flores1

  • 1Facultad de Química, Universidad de Vigo, E-36310-Vigo (Pontevedra), Spain.

The Journal of Chemical Physics
|March 5, 2014
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Summary
This summary is machine-generated.

Aluminum clusters interacting with water molecules can split water to produce hydrogen gas. Hydrogen atom migration on the cluster surface is key, but energy dissipation slows this process, limiting tunneling

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Aluminum clusters (Alm) interacting with water (H2O) can produce hydrogen gas (H2) via water splitting.
  • Hydrogen atom migration on the cluster surface is crucial for the H2 production mechanism.

Purpose of the Study:

  • Investigate the gas-phase evolution of HAl17(OH)((-)) as a model system for water splitting by aluminum clusters.
  • Determine the role of hydrogen atom migration and tunneling in H2 generation.

Main Methods:

  • Density Functional Theory (DFT) for locating energy minima and saddle points.
  • Molecular Dynamics (MD) and Rice-Ramsperger-Kassel-Marcus (RRKM) theory with tunneling effects.

Main Results:

  • The H atom, after bonding to the Al cluster in Al17((-))·(H2O) → HAl17(OH)((-)), rapidly loses excess energy due to cluster flexibility.
  • This rapid energy dissipation significantly slows down long-range hydrogen migration.
  • Tunneling effects appear to play a secondary role in migration dynamics at moderate energies.

Conclusions:

  • The flexibility of aluminum clusters facilitates rapid energy absorption, hindering efficient hydrogen atom migration.
  • The study suggests that hydrogen migration, not tunneling, is the rate-limiting step in H2 production for this model system.
  • Understanding these dynamics is crucial for designing efficient hydrogen generation processes using aluminum clusters and water.