Features in Energy Accumulation in Double Layer on the surface of Graphene Material

TL;DR

This paper investigates the quantum limitations on energy storage in graphene-based supercapacitors, identifying fundamental density of states constraints and proposing solutions to enhance capacitance.

Contribution

It determines the maximum specific capacitance of nanostructured graphene electrodes considering quantum effects near the Dirac point.

Findings

Quantum density of states limits energy density in graphene supercapacitors.

Maximum specific capacitance of nanostructured graphene is quantified.

Technical solutions to mitigate quantum limitations are discussed.

Abstract

An application of quantum size carbon structures--graphenes as electrodes of supercapacitors is studied. A fundamental limit of energy and power density arising from quantum nature of objects due to singularity in graphene density of states near Dirac point is determined and technical solutions to partially offset the negative factors are considered. The maximum possible specific capacitance of nanostructured electrode materials is determined.