期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 47, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902915
关键词
aqueous electrolytes; energy storage; graphene; hybrid supercapacitors; Zn metal anodes
类别
资金
- Hong Kong Research Grants Council [11338016]
- Shenzhen Science and Technology Innovation Council [JCYJ20160428154522334]
- National Nature Science Foundation of China [NSFC 51672230]
Integrating a battery-type electrode to build a hybrid supercapacitor is a promising approach to improve the overall energy density of a supercapacitor-type energy storage device without sacrificing its power output. However, this strategy is usually achieved at the expense of cycling lifespan. In this work, a hybrid supercapacitor comprising Zn foil and porous carbon derived from chemical activated graphene (aMEGO) is developed, and the trade-off between energy density and cycling life is well-balanced by the utilization of 3 m Zn(CF3SO3)(2) electrolyte with high Zn stripping/plating efficiency. Such a hybrid supercapacitor demonstrates an energy density of 106.3 Wh kg(-1) and a power density of 31.4 kW kg(-1), and significantly a wide operation voltage of 1.9 V is achieved in aqueous electrolyte. Benefitting from the high Zn stripping/plating efficiency, the Zn-aMEGO hybrid-supercapacitor also exhibits an ultralong cycling life up to 80 000 cycles with capacity retention of 93%, which is comparable to that of conventional electrochemical double-layer capacitors.
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