Journal
ACS NANO
Volume 7, Issue 12, Pages 11325-11332Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn405192s
Keywords
supercapacitors; graphene; iron nanosheets; ultrahigh energy density
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Funding
- National Science Foundation of China [51077014, 21003028, 51202043]
- Fundamental Research funds for the Central Universities
- Program for New Century Excellent Talents in University [NCET-10-0050]
- Excellent Youth Foundation of Heilongjiang Province of China
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We report a facile strategy to prepare iron nanosheets directly grown on graphene sheets nanocomposite (C-PGF) through the carbonization of iron ions adsorbed onto polyaniline nanosheet/graphene oxide hybrid material. Because of the synergistic effect of iron nanosheets and graphene sheets, the as-obtained C-PGF exhibits an ultrahigh capacitance of ca. 720 F g(-1) in 6 M KOH aqueous solution. Additionally, the assembled asymmetric supercapacitor (C-PGF//Ni(OH)(2)/CNTs) delivers a remarkable high power density and a noticeable ultrahigh energy density of ca. 140 Wh kg(-1) (based on the total mass of active materials) and an acceptable cycling performance of 78% retention after 2000 cycles. Therefore, the designed supercapacitors with high energy density, comparable to rechargeable lithium-ion batteries (LIBs), offer an important guideline for future design of advanced next-generation supercapacitors for both industrial and consumer applications.
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