First-Principles Approach to Model Electrochemical Reactions: Understanding the Fundamental Mechanisms behind Mg...

Area of Science:

• Computational materials science
• Electrochemical corrosion science
• Semiconductor physics

Background:

• Electrochemical systems present complex corrosion challenges.
• Ab initio calculations are crucial for understanding material behavior.
• Standard computational methods struggle with controlled potentiostat conditions.

Purpose of the Study:

• To develop a novel computational approach for ab initio calculations under potentiostat conditions.
• To apply this method to study initial corrosion at the water-Mg interface.
• To elucidate the atomistic origins of anodic hydrogen evolution.

Main Methods:

• Integration of semiconductor physics and corrosion science principles.
• Development of a novel ab initio calculation framework.
• Application within standard density functional theory (DFT) codes.
• Simulation of electrochemical systems under anodic polarization.

Main Results:

• Successful implementation of ab initio calculations under controlled potentiostat conditions.
• Detailed study of chemical reactions during initial Mg corrosion.
• Derivation of an atomistic model for anodic hydrogen evolution.
• Demonstration of the approach's performance and versatility.

Conclusions:

• The novel computational approach enables accurate modeling of electrochemical systems.
• The study provides atomistic insights into magnesium corrosion mechanisms.
• The derived model successfully explains the origin of anodic hydrogen evolution.