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Maxim V Fedorov¹, R M Lynden-Bell

¹Max Planck Institute for Mathematics in the Sciences, Inselstrasse 22, Leipzig 04103, Germany.

Physical Chemistry Chemical Physics : PCCP

|January 21, 2012

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Molecular dynamics simulations reveal distinct ionic liquid layers at the graphene interface, driven by cation enrichment. This structure creates energy barriers affecting probe interactions with the graphene surface.

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Area of Science:

Materials Science
Physical Chemistry
Computational Chemistry

Background:

Understanding the interface between graphene and ionic liquids is crucial for applications like energy storage and catalysis.
Ionic liquids exhibit complex interfacial structures due to ion-surface interactions.

Purpose of the Study:

To investigate the fundamental mechanisms of interfacial layer formation at the graphene-[1,3-dimethylimidazolium chloride] ([dmim][Cl]) interface.
To analyze the influence of probe charge and size on interfacial interactions using molecular dynamics.

Main Methods:

Fully atomistic molecular dynamics simulations were employed.
A spherical probe with varying charges (-1e, 0, +1e) and sizes (0.50 nm, 0.38 nm diameter) was used to probe the interface.

Main Results:

Significant enrichment of [dmim][Cl] cations was observed at the graphene surface, forming distinct ionic liquid layers.
A strong asymmetry in probe interactions with graphene was found, attributed to preferential cation adsorption.
Higher energy barriers for cationic probes approaching the graphene wall were identified compared to anionic probes.

Conclusions:

The study elucidates the layered structure formation at the graphene-ionic liquid interface.
Preferential cation adsorption dictates interfacial properties and influences probe interactions.
Simulation results align with existing experimental data on ionic liquid interfacial structures.