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High energy density supercapacitor based on N/B co-doped graphene nanoarchitectures and ionic liquid electrolyte.
- Source :
- Ionics; Sep2019, Vol. 25 Issue 9, p4351-4360, 10p
- Publication Year :
- 2019
-
Abstract
- Boron-nitrogen co-doped graphene nanoarchitectures were synthesized by annealing a freeze-dried precursor containing exfoliated graphene oxide (GO) nanosheets, ammonium borate, and polyvinyl alcohol (PVA). The microstructures and composition of nanocomposites were optimized and characterized systemically. Effects of a doping element on the electrochemical performances and interface compatibility were evaluated. The restacking of exfoliated graphene nanosheets was hindered effectively by the ultra-fine carbon clusters formed via the thermal decomposition of PVA. Such a three-dimensional structure favors the fast mobility of electrolyte ions. In addition, the co-doping of N and B elements not only increases interface compatibility between ionic liquid electrolyte and graphene but also supplies extra pseudocapacitance. Benefiting from the integrated merits, the optimized nanocomposites could deliver a specific capacitance of 35.4 F g<superscript>−1</superscript> at 1 A g<superscript>−1</superscript> and present a maximum energy density of 78.7 Wh kg<superscript>−1</superscript> with a power density of 2043 W kg<superscript>−1</superscript>. Due to the formation of more decoupled ions in ionic liquid electrolyte at elevated temperature, the symmetric supercapacitors based on the as-formed nanocomposite exhibit a maximum energy density of 134.6 Wh kg<superscript>−1</superscript> at 60 °C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09477047
- Volume :
- 25
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Ionics
- Publication Type :
- Academic Journal
- Accession number :
- 138108963
- Full Text :
- https://doi.org/10.1007/s11581-019-02987-6