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High coverage water adsorption on CuO(011) surface.

Xiaohu Yu1, Xuemei Zhang

  • 1Institute of Theoretical and Computational Chemistry, Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Sciences, Shaanxi University of Technology, Hanzhong 723000, P. R. China. yuxiaohu950203@126.com.

Physical Chemistry Chemical Physics : PCCP
|July 12, 2017
PubMed
Summary
This summary is machine-generated.

Water adsorption on copper oxide surfaces can be molecular or dissociative. This study reveals that while one water molecule adsorbs molecularly, more lead to dissociation, with mixed states occurring at higher coverages.

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Area of Science:

  • Surface Science
  • Computational Materials Science
  • Physical Chemistry

Background:

  • Understanding water-surface interactions is crucial for catalysis and corrosion.
  • Copper oxide (CuO) surfaces are relevant in various chemical processes.

Purpose of the Study:

  • To investigate the adsorption behavior of water on the CuO(011) surface.
  • To determine the preferred adsorption states (molecular vs. dissociative) at different coverages.
  • To analyze the thermodynamic stability and energetic contributions to water adsorption.

Main Methods:

  • Spin-polarized density functional theory (DFT) calculations with GGA+U.
  • Atomic thermodynamics.
  • Boltzmann model analysis for temperature-dependent adsorption.

Main Results:

  • Monolayer water adsorption on CuO(011) is molecularly favorable.
  • Dissociative adsorption is preferred for two and three water molecules.
  • A mixed molecular and dissociative coadsorption state is favorable for four water molecules.
  • Thermodynamic analysis indicates favorable adsorption for three and four water molecules.
  • Adsorption energy is influenced by surface copper/oxygen atoms and hydrogen bonding.

Conclusions:

  • The adsorption mechanism of water on CuO(011) transitions from molecular to dissociative with increasing coverage.
  • Thermodynamic stability favors higher water coverages under specific conditions.
  • Electronic structure and chemical bonding govern the observed adsorption energetics.