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Tuning the work function of graphite nanoparticles via edge termination
Michael P Mercer1,2,3, Arihant Bhandari3,4, Chao Peng5
1Department of Chemistry, Lancaster University, Bailrigg, Lancaster, LA1 4YB, UK. m.mercer1@lancaster.ac.uk.
Physical Chemistry Chemical Physics : PCCP
|May 28, 2024
Summary
Surface termination of graphite nanoparticles significantly alters their work function, enabling control over electrochemical applications like lithium-ion batteries and supercapacitors. This finding is crucial for designing advanced energy materials.
Area of Science:
- Materials Science
- Surface Chemistry
- Computational Chemistry
Background:
- Graphite nanoparticles are vital for energy storage and catalysis.
- Tuning nanoparticle work function is key for optimizing electrochemical performance.
Purpose of the Study:
- To investigate how surface termination affects the work function of graphite nanoparticles.
- To understand the relationship between nanoparticle size, surface termination, and electrochemical potential.
Main Methods:
- Large-scale density functional theory (DFT) calculations were employed.
- Simulations were performed in both vacuum and electrolyte conditions.
- Analysis focused on edge and basal plane potential distributions.
Main Results:
- Surface termination (e.g., hydrogen, oxygen) significantly modifies the work function.
- Edge termination impacts potential across the entire nanoparticle, including the basal plane.
- Nanoparticle size influences the basal plane area and work function.
Conclusions:
- Surface termination offers a method to tune the electrochemical properties of graphite nanoparticles.
- Insights are applicable to controlling lithiation in batteries and performance in supercapacitors.
- Controlled synthesis conditions (oxidizing/reducing) can leverage these findings for tailored nanomaterials.
