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Halide adsorption on close-packed metal electrodes.

Tanglaw Roman1, Florian Gossenberger, Katrin Forster-Tonigold

  • 1Institute of Theoretical Chemistry, Ulm University, 89069 Ulm, Germany. tanglaw.roman@uni-ulm.de.

Physical Chemistry Chemical Physics : PCCP
|March 20, 2014
PubMed
Summary
This summary is machine-generated.

Adsorbing electronegative atoms on metal surfaces can decrease work function. This study distinguishes between electron spillout and adatom polarization mechanisms, offering a unified view of bond ionicity.

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Area of Science:

  • Surface Science
  • Materials Science
  • Computational Chemistry

Background:

  • Work function decrease upon adsorption of electronegative adatoms is attributed to electron spillout and adatom polarization.
  • These two proposed mechanisms lack a clear distinction and unified interpretation.

Purpose of the Study:

  • To investigate the work function changes upon halide adsorption on fcc metal surfaces.
  • To differentiate between electron spillout depletion and adatom polarization mechanisms.
  • To establish a general framework for interpreting bond ionicity from work function changes.

Main Methods:

  • Periodic density functional theory (DFT) calculations were employed.
  • The study focused on halide adsorption on (111) surfaces of various fcc metals.
  • Work function changes were systematically analyzed.

Main Results:

  • The electron spillout depletion and adatom polarization mechanisms were found to be independent.
  • Factors contributing to work function decrease were clearly distinguishable for each mechanism.
  • A correlation between work function changes and bond ionicity was discussed.

Conclusions:

  • The study successfully differentiates between the two primary mechanisms of work function decrease.
  • A more comprehensive understanding of bond ionicity in metal-adsorbate systems is proposed.
  • The findings provide a foundation for predicting and interpreting surface phenomena.