Heteroatom-Substituted Reflashed Graphene

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Flash Joule heating is a scalable method for producing graphene and doped graphene.
• Current methods for producing doped graphene via flash Joule heating have limitations in heteroatom incorporation.

Purpose of the Study:

• To develop a modified flash Joule heating technique for enhanced heteroatom substitution in graphene.
• To demonstrate the incorporation of various heteroatoms (N, S, P, F) and multiheteroatom substitution.
• To evaluate the performance of heteroatom-doped graphene in battery anodes.

Main Methods:

• Reflashing pre-formed graphene in the presence of heteroatom-donating compounds.
• Utilizing lower temperatures compared to previous flash Joule heating methods for doping.
• Characterizing the substituted graphene using various analytical techniques.
• Fabricating and testing battery anodes using the synthesized doped graphene.

Main Results:

• Achieved up to 18 atom % heteroatom substitution in the graphene lattice.
• Successfully demonstrated nitrogen, sulfur, phosphorus, and fluorine atom substitution, as well as multiheteroatom doping.
• Nitrogen-substituted reflashed graphene anodes showed improved performance and stability in batteries compared to unsubstituted graphene.

Conclusions:

• The modified flash Joule heating technique enables efficient and high-level heteroatom doping of graphene.
• The synthesized heteroatom-doped graphene shows promise for advanced energy storage applications, particularly in battery anodes.
• This method offers a scalable route to producing functionalized graphene materials with tailored properties.