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

  • 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.

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Document Type:Article
Author:Julia K. Ewert, Daniel Weingarth, Christine Denner, Martin Friedrich, Marco ZeigerORCiD, Anna Schreiber, Nicolas JäckelORCiD, Volker PresserORCiD, Rhett KempeORCiD
Parent Title (English):Journal of Materials Chemistry A
First Page:18906
Last Page:18912
Year of first Publication:2015
Date of final exam:2015/08/05
Release Date:2022/11/18
Impact:08.262 (2015)
Funding Information:German Federal Ministry for Research and Education (BMBF) in support of the nanoEES3D project (award number 03EK3013) as part of the strategic funding initiative energy storage framework / the SFB 840 / the Elitenetzwerk Bayern e. V.
Research Groups:Energy Materials
Open Access:Open Access
Signature:INM 2015/082
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International