Journal
CARBON
Volume 168, Issue -, Pages 499-507Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.07.004
Keywords
Carbon hydrangea; Ion-matched pore; Ionic liquid gel electrolyte; Solid-state supercapacitor; Ultrahigh specific energy
Funding
- National Natural Science Foundation of China [21875165, 51772216, 21905207, 21703161]
- Science and Technology Commission of Shanghai Municipality, China [14DZ2261100]
- Natural Foundation of Hubei Province of China [2014CFB782]
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
Pore-ion size matching between carbon electrodes and electrolytes is crucial for superior energy storage. However, it remains a great challenge to engineer carbons with perfectly compatible pore dimension for desired electrolytes. Herein we design a simple synthetic route to obtain carbon hydrangeas integrated with unique geometry, high surface areas, N/O doping, and more importantly, well-developed pore structure. The narrow primary subnanopores of 0.80 nm are exactly matched the cation sizes (EMIM+, 0.76 nm) of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) and 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) ionic liquid electrolytes. Besides, the secondary pores of 0.50 nm are size-exclusively accessible for small BF4- anions (0.48 nm) but exclude larger TFSI- (0.79 nm), giving enhanced ion diffusion/adsorption kinetics. The solid-state supercapacitor based on EMIMBF4 gel electrolyte achieves an ultrahigh specific energy of 101.2 Wh kg(-1) (29.2% enhancement against the use of EMIMTFSI), superior to the most values of recently reported carbon-based supercapacitors. This study opens new horizons to develop functionalized carbons with perfectly ion-comparable pore architecture, moving toward advanced energy storage systems. (C) 2020 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available