Designing of Highly Efficient Oxygen Evolution Reaction Electrocatalysts Utilizing A Correlation Factor: Theory and...

Area of Science:

• Materials Science
• Electrochemistry
• Theoretical Chemistry

Background:

• Theoretical prediction of catalytic activity is crucial for designing efficient catalysts.
• Existing descriptors primarily focus on activity and mechanism, lacking correlation with preparation methods.
• A factor linking descriptors to preparation methods is needed for catalyst design.

Purpose of the Study:

• To develop a correlation factor linking theoretical descriptors with catalyst preparation methods.
• To investigate the d electron density of transition metal ions as a correlation factor.
• To correlate d band center values with amorphization and Al introduction preparation methods.

Main Methods:

• Theoretical simulations were employed to develop and validate the correlation factor.
• The d electron density of transition metal ions was used as the correlation factor.
• Linear relationships between the correlation factor, theoretical overpotentials, and preparation methods were analyzed.

Main Results:

• The d electron density showed a favorable linear relationship with theoretical overpotentials for (CoFeAl)3O4 systems.
• The correlation factor successfully linked preparation methods (amorphization, Al introduction) with system volume.
• Electrocatalytic activity of (CoFeAl)3O4 specimens improved with amorphization and Al introduction.
• The Am-CoFeAl-2-10h specimen demonstrated a low kinetic barrier (268 mV), fast charge transfer, and stable activity.

Conclusions:

• The d electron density serves as an effective correlation factor between catalyst descriptors and preparation methods.
• This strategy enables the rational design of highly efficient electrocatalysts by tuning the active site's correlation factor.
• The findings provide a pathway for optimizing catalyst preparation for enhanced performance in energy conversion applications.