Energy Decomposition Analysis for Metal Surface-Adsorbate Interactions by Block Localized Wave Functions.

Area of Science:

• Computational Chemistry
• Surface Science
• Quantum Chemistry

Background:

• Energy Decomposition Analysis (EDA) using Block Localized Wave Functions (BLW-EDA) provides insights into chemical bonding.
• Standard BLW-EDA is limited to systems without fractional orbital occupations, excluding metallic surfaces.
• Understanding interactions on metallic surfaces is crucial for catalysis.

Purpose of the Study:

• To extend BLW-EDA to handle fractionally occupied orbitals, enabling its application to metallic surfaces.
• To analyze the nature of adsorbate interactions on the Pt(111) surface.
• To investigate the roles of polarization and charge transfer in surface adsorption.

Main Methods:

• Development of Ensemble BLW-EDA (E-BLW-EDA) to accommodate fractional orbital occupations.
• Application of E-BLW-EDA to model systems with various adsorbates on Pt(111).
• Decomposition of interaction energy into frozen, polarization, and charge transfer terms.

Main Results:

• E-BLW-EDA successfully analyzes interactions on metallic surfaces.
• Polarization and charge transfer are significant contributors to adsorption energy for all studied adsorbates.
• The method differentiates adsorption site preferences and explains adsorption energy differences (e.g., H2S vs. H2O).

Conclusions:

• Ensemble BLW-EDA is a practical extension for analyzing chemical bonding on metallic surfaces.
• The findings highlight the importance of polarization and charge transfer in surface chemistry.
• This development facilitates a deeper understanding of catalytic processes involving metallic systems.