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Issue 37, 2015
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Enhanced capacitance of nitrogen-doped hierarchically porous carbide-derived carbon in matched ionic liquids

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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

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Publication details

The article was received on 27 Jun 2015, accepted on 03 Aug 2015 and first published on 05 Aug 2015


Article type: Paper
DOI: 10.1039/C5TA04773K
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Citation: J. Mater. Chem. A, 2015,3, 18906-18912
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    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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