# Van-der-Waals-forces-modulated graphene-P-phenyl-graphene carbon allotropes

## TL;DR

Researchers developed a new carbon material called Graphene-P-phenyl-Graphene, which shows high conductivity and potential for use in potassium-ion batteries.

## Contribution

The novel contribution is the synthesis of a new carbon allotrope with enhanced electron mobility and ion storage capabilities.

## Key findings

- Graphene-P-phenyl-Graphene has a layer spacing of ~0.56 nm, reducing van der Waals forces and enhancing electron delocalization.
- The material exhibits high Hall mobility (10,000–13,000 cm² V⁻¹ s⁻¹) and is suitable for potassium-ion batteries with high performance.
- It enables rapid ion storage and transport, even for large ions like potassium.

## Abstract

Graphene has received much attention due to its monoatomic, unique two-dimensional structure, which results in remarkable mechanical, physical, and electrical properties. However, synthesizing high-quality graphene-based composites with high conductivity and ionic mobility remains challenging. Here, we report an allotrope to the nanocarbon family, Graphene-P-phenyl-Graphene, synthesized by inserting π-π-conjugated p-phenyls between graphene layers and connecting them via C–C σ bonds. Graphene-P-phenyl-Graphene is thermally and dynamically stable, as verified by density functional theory and molecular dynamics, and can be produced at kilogram scale. The p-phenyl bridges swell the layer spacing from ~0.34 to ~0.56 nm, reducing van der Waals forces and enhancing electron delocalization. Electrons in these separated graphene layers benefit from low mass and efficient 3D screening of charge scattering, resulting in high Hall mobility (10,000–13,000 cm² V⁻¹ s⁻¹) in freestanding films. The expanded spacing also enables decoupling of layer electrons and rapid ion storage and transport—even for large ions. For example, potassium-ion batteries using Graphene-P-phenyl-Graphene exhibit high reversible capacity, long-term stability, and high charge-discharge rates. Graphene-P-phenyl-Graphene holds promise for large-scale, portable, high-performance electronics with energy storage capabilities.

Here the authors report an allotrope to the nanocarbon family, Graphene-P-phenyl-Graphene, for potassium-ion batteries.