期刊
IONICS
卷 25, 期 6, 页码 2781-2789出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-018-2785-y
关键词
Nitrogen and sulfur co-doped; Ionic liquid; Hierarchical porous structure; Supercapacitor
资金
- National Natural Science Foundation of China [21573058, 21303044, 21173070]
- Program for Innovative Research Team in Science and Technology in University of Henan Province [15IRTSTHN 003, 17IRTSTHN 001]
In this paper, nitrogen and sulfur co-doped graphene aerogel (NS-GA) was successfully prepared using ionic liquid 1-(4-mercaptobutyl)-3-methylimidazolium bromide (HS-BMIMBr) as both reductant and dopant by a one-step hydrothermal method. The results of X-ray diffraction indicate that the doping of heteroatoms into graphene increases its degree of defects. In addition, scanning electron microscopy measurements and nitrogen adsorption-desorption analysis reveal that the as-prepared NS-GA has unique hierarchical porous nanostructures, which supply efficient networks for ionic transports and electron transfer. The symmetric electrical double-layer capacitors (EDLCs) based on the NS-GA with ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate, EMIMBF4) as the electrolyte show excellent capacitive performance. And the NS-GA has a high specific capacitance of 182.3Fg(-1) at a current density of 1Ag(-1). Moreover, there is a high energy density of 101Whkg(-1) at a power density of 1kWkg(-1). Therefore, the NS-GA can be considered as a favorable electrode material for high-performance energy storage devices.
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