期刊
IONICS
卷 25, 期 9, 页码 4351-4360出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-019-02987-6
关键词
Doping effect; Graphene; Supercapacitor; Ionic liquid
资金
- National Key Research and Development Program of China [2016YFB0100303]
- Key Research Program of Frontier Sciences [QYZDY-SSW-JSC011]
- National Natural Science Foundation of China [21878308]
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(-1) at 1 A g(-1) and present a maximum energy density of 78.7 Wh kg(-1) with a power density of 2043 W kg(-1). 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(-1) at 60 degrees C.
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