Enhanced capacitance of nitrogen-doped hierarchically porous carbide-derived carbon in matched ionic liquids

J.-K. Ewert,R. Kempe,C. Denner,V. Presser,M. Friedrich,D. Weingarth,N. Jäckel,A. Schreiber,M. Zeiger

doi:10.1039/c5ta04773k

Abstract

Supercapacitor performance can be significantly increased when matching a suitable ionic liquid to nitrogen-doped nanoporous carbon.

Highlights

Electrochemical capacitors, known as supercapacitors or ultracapacitors, capitalize on the high efficiency and performance stability of fast electrosorption of electrolyte ions at the charged interface with nanoporous carbon.[1,2] While derived from abundantly available biomass, commonly used high surface area carbons show only a moderate electrical conductivity, which presents a limitation to effective charge screening, leading to limited energy storage capacity.[3]
Supercapacitors combine efficient electrical energy storage and performance stability based on fast electrosorption of electrolyte ions at charged interfaces
Our studies indicate that matching of the electrode material and the ionic liquid leads to a constant normalized resistance of the electrode material and a significant enhancement of the specific capacitance

Summary

Introduction

Electrochemical capacitors, known as supercapacitors or ultracapacitors, capitalize on the high efficiency and performance stability of fast electrosorption of electrolyte ions at the charged interface with nanoporous carbon.[1,2] While derived from abundantly available biomass, commonly used high surface area carbons show only a moderate electrical conductivity, which presents a limitation to effective charge screening, leading to limited energy storage capacity.[3]. Enhanced capacitance of nitrogen-doped hierarchically porous carbide-derived carbon in matched ionic liquids† We report a novel hierarchically structured N-doped carbon material and a significant capacitance enhancement for a specific ionic liquid.

Results

Conclusion