Issue 37, 2015

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

Abstract

Supercapacitors combine efficient electrical energy storage and performance stability based on fast electrosorption of electrolyte ions at charged interfaces. They are a central element of existing and emerging energy concepts. A better understanding of capacitance enhancement options is essential to exploit the full potential of supercapacitors. Here, we report a novel hierarchically structured N-doped carbon material and a significant capacitance enhancement for a specific ionic liquid. Our studies indicate that matching of the electrode material and the ionic liquid specifically leads to a constant normalized resistance of the electrode material (voltage window up to ±1 V vs. carbon) and a significant enhancement of the specific capacitance. Such effects are not seen for standard organic electrolytes, non-matched ionic liquids, or non-N-doped carbons. A higher N-doping of the electrode material improves the symmetric full cell capacitance of the match and considerably increases its long-term stability at +3 V cell voltage. This novel observance of enhanced specific capacitance for N-doped carbons with matched ionic liquid may enable a new platform for developing supercapacitors with enhanced energy storage capacity.

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

Supplementary files

Article information

Article type
Paper
Submitted
27 Jun 2015
Accepted
03 Aug 2015
First published
05 Aug 2015
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2015,3, 18906-18912

Author version available

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

J.-K. Ewert, D. Weingarth, C. Denner, M. Friedrich, M. Zeiger, A. Schreiber, N. Jäckel, V. Presser and R. Kempe, J. Mater. Chem. A, 2015, 3, 18906 DOI: 10.1039/C5TA04773K

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