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Water/InP(001) from Density Functional Theory.

Isaac Azahel Ruiz Alvarado1, Wolf Gero Schmidt1

  • 1Lehrstuhl für Theoretische Materialphysik, Universität Paderborn, 33095 Paderborn, Germany.

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Summary
This summary is machine-generated.

Density functional theory reveals water adsorption on InP(001) surfaces. Increasing coverage promotes molecular interactions and film formation, crucial for understanding InP

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Area of Science:

  • Surface Science
  • Computational Materials Science
  • Electrochemistry

Background:

  • The InP(001) surface interaction with water is critical for applications in catalysis and electronics.
  • Understanding water adsorption and dissociation mechanisms is key to controlling surface properties.

Purpose of the Study:

  • To investigate water adsorption, dissociation, and film formation on In-rich InP(001) surfaces using density functional theory.
  • To characterize the electrocatalytic activity of InP for oxygen and hydrogen evolution reactions at the water interface.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Simulations of water coverage from single molecules to multiple overlayers.
  • Analysis of adsorption energies, dissociation barriers, and interface properties.

Main Results:

  • Single water molecules preferentially adsorb on three-fold coordinated In atoms.
  • Water dissociation is favorable but faces an energy barrier that decreases with coverage.
  • Attractive interactions lead to molecular clusters and stable water films, resembling ice Ih.
  • Calculated overpotentials for oxygen evolution (1.7-1.8 eV) and hydrogen evolution (0.2-0.3 eV) on InP.
  • An interface dipole at the InP/water interface shifts the valence band maximum, favoring oxygen and hydrogen evolution.

Conclusions:

  • Water adsorption on InP(001) is coverage-dependent, leading to ordered films.
  • The InP/water interface facilitates both oxygen and hydrogen evolution reactions due to band edge alignment.
  • These findings provide insights into the electrochemical behavior of InP surfaces.