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Oxygen-assisted water partial dissociation on copper: a model study.

Ying-Qi Wang1, Li-Fen Yan, Gui-Chang Wang

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Physical Chemistry Chemical Physics : PCCP
|March 4, 2015
PubMed
Summary
This summary is machine-generated.

Pre-adsorbed oxygen atoms significantly enhance water O-H bond cleavage on copper surfaces. This promotion effect in heterogeneous catalysis depends on oxygen binding strength and proximity to water

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Area of Science:

  • Surface Science
  • Heterogeneous Catalysis
  • Computational Chemistry

Background:

  • Controlling O-H bond cleavage on metal surfaces is crucial for heterogeneous catalytic processes.
  • Pre-adsorbed oxygen atoms play a significant role in modifying surface reactivity.

Purpose of the Study:

  • To investigate the adsorption and dissociation of water on clean and oxygen-pre-adsorbed copper surfaces.
  • To understand the influence of pre-adsorbed oxygen on water O-H bond cleavage dynamics.

Main Methods:

  • Density Functional Theory-Generalized Gradient Approximation (DFT-GGA) calculations were employed.
  • Investigated various copper surfaces (e.g., Cu(111), Cu(110)) and oxygen configurations (ad-row, ad-atom).

Main Results:

  • Pre-adsorbed oxygen species significantly promote water dissociation on copper surfaces.
  • Promotion effect is inversely related to oxygen adsorption energy and directly related to proximity between oxygen and hydrogen.
  • Electronic analysis reveals acid-base pair interactions as the origin of the promotion.

Conclusions:

  • Pre-adsorbed oxygen is an effective promoter for water dissociation in heterogeneous catalysis.
  • Surface structure and oxygen binding characteristics dictate the extent of water O-H bond cleavage promotion.
  • Understanding these interactions provides insights for designing efficient catalytic systems.