期刊
SMALL
卷 13, 期 37, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201701288
关键词
stacking density; supercapacitors; vertically aligned graphene; wettability
类别
资金
- NSFC [21522601, U1508201, 21361162004]
- National Key Research Development Program of China [2016YFB0101201]
The high-performance electrode materials with tuned surface and interface structure and functionalities are highly demanded for advanced supercapacitors. A novel strategy is presented to conFigure high-stacking-density, superior-roughness nickel manganese layered double hydroxide (LDH) bridged by vertically aligned graphene (VG) with nickel foam (NF) as the conductive collector, yielding the LDH-NF@VG hybrids for asymmetric supercapacitors. The VG nanosheets provide numerous electron transfer channels for quick redox reactions, and well-developed open structure for fast mass transport. Moreover, the high-stacking-density LDH grown and assembled on VG nanosheets result in a superior hydrophilicity derived from the tuned nano/microstructures, especially microroughness. Such a high stacking density with abundant active sites and superior wettability can be easily accessed by aqueous electrolytes. Benefitting from the above features, the LDH-NF@VG can deliver a high capacitance of 2920 F g(-1) at a current density of 2 A g(-1), and the asymmetric supercapacitor with the LDH-NF@VG as positive electrode and activated carbon as negative electrode can deliver a high energy density of 56.8 Wh kg(-1) at a power density of 260 W kg(-1), with a high specific capacitance retention rate of 87% even after 10 000 cycles.
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