Jump to main content
Jump to site search

Issue 1, 2016
Previous Article Next Article

Geometrically confined favourable ion packing for high gravimetric capacitance in carbon–ionic liquid supercapacitors

Author affiliations

Abstract

A supercapacitor, a safe and durable electrical energy storage device with fast charge–discharge capability, will achieve more widespread use if the specific energy can be improved. However, current understanding of pore characteristic effects on gravimetric capacitance has limited the development of electrode materials. We derive a model of ion packing in cylindrical nanopores, and it quantitatively reveals the significant impact of pore geometric characteristics on the gravimetric capacitance in neat ionic liquid, which is confirmed experimentally using a series of sponge-like carbons (carbon nanosponge). With the favourable ion packing proposed by the model, the electrode using the carbon nanosponge as an active material delivered double-layer capacitances of 290 F g−1 (20 °C) and 387 F g−1 (60 °C) with an operating cell voltage of 4 V. This study also provides systematical strategies for rational design of various carbon materials and ionic liquids by optimized ion packing for ultrahigh gravimetric capacitance.

Graphical abstract: Geometrically confined favourable ion packing for high gravimetric capacitance in carbon–ionic liquid supercapacitors

Back to tab navigation

Supplementary files

Article information


Submitted
02 Sep 2015
Accepted
12 Nov 2015
First published
12 Nov 2015

Energy Environ. Sci., 2016,9, 232-239
Article type
Paper
Author version available

Geometrically confined favourable ion packing for high gravimetric capacitance in carbon–ionic liquid supercapacitors

X. Wang, H. Zhou, E. Sheridan, J. C. Walmsley, D. Ren and D. Chen, Energy Environ. Sci., 2016, 9, 232
DOI: 10.1039/C5EE02702K

Social activity

Search articles by author

Spotlight

Advertisements