期刊
JOURNAL OF POWER SOURCES
卷 280, 期 -, 页码 606-611出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.01.153
关键词
High voltage graphene capacitor; Ionic liquid; Dicyanamide; Polydicyanamide; Electropolymerization
资金
- Estonian Ministry of Education and Research [SF0180002s08]
- Estonian Centers of Excellence in Research Project High-technology Materials for Sustainable Development [TK117T]
Atomically thin graphene is a promising capacitor electrode material, but the cell voltages achieved so far with various electrolytes are too low for a typical capacitor's application. In this paper it is demonstrated that in a dicyanamide-based ionic liquid electrolyte a graphene electrode passivates at 10 V and at the same time the conductivity of the single-layer graphene sheet increases more than 5 times. The protective self-healing nanolayer formed is a new carbon nitrogen material with dielectric constant value up to 9.8. In the cell voltage range from 4 to 10 V, capacitors with large surface area reduced graphene oxide electrodes outperform any commercial capacitor technology by better energy density. (C) 2015 Elsevier B.V. All rights reserved.
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