Epitaxial Metal Electrodeposition Controlled by Graphene Layer Thickness

Area of Science:

• Materials Science
• Electrochemistry
• Surface Science

Background:

• Controlling material structure during electrodeposition is crucial for synthesis and energy applications.
• Epitaxy on current collectors offers a method for crystallographic control.
• Graphene on metal foils can enable remote epitaxy for electrodeposited metals like Cu and Zn.

Purpose of the Study:

• To investigate the influence of graphene layer thickness on the electrodeposition of Zn and Cu.
• To understand the substrate-graphene-deposit interactions governing epitaxial electrodeposition.
• To determine the critical graphene thickness for achieving remote epitaxy.

Main Methods:

• Electrodeposition of Zn and Cu on graphene-coated metal foils.
• Scanning transmission electron microscopy (STEM) for morphology and structure analysis.
• Electron backscatter diffraction (EBSD) for crystallographic orientation.
• Density functional theory (DFT) simulations for electronic interactions.

Main Results:

• Remote epitaxy of Zn and Cu was achieved on monolayer and bilayer graphene.
• Trilayer and thicker graphite did not support remote epitaxy.
• DFT simulations identified specific electronic interactions through thin graphene that facilitate remote epitaxy.

Conclusions:

• Graphene layer thickness critically influences the occurrence of electrochemical remote epitaxy.
• Monolayer and bilayer graphene effectively promote crystallographic control in electrodeposition.
• This study provides insights into the mechanisms of remote epitaxy and strategies for controlled electrodeposition.