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나노 구조 물리 연구단
나노구조물리 연구단
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Carbon nanotube-bridged graphene 3D building blocks for ultrafast compact supercapacitors Highly Cited Paper

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Title
Carbon nanotube-bridged graphene 3D building blocks for ultrafast compact supercapacitors
Author(s)
Duy Tho Pham; Tae Hoon Lee; Dinh Hoa Luong; Fei Yao; Arunabha Ghosh; Viet Thong Le; Tae Hyung Kim; Bing Li; Jian Chang; Young Hee Lee
Publication Date
2015-02
Journal
ACS NANO, v.9, no.2, pp.2018 - 2027
Publisher
AMER CHEMICAL SOC
Abstract
The main obstacles to achieving high electrochemical energy density while retaining high power density are the trade-offs of energy versus power and gravimetric versus volumetric density. Optimizing structural parameters is the key to circumvent these trade-offs. We report here the synthesis of carbon nanotube (CNT)-bridged graphene 3D building blocks via the Coulombic interaction between positively charged CNTs grafted by cationic surfactants and negatively charged graphene oxide sheets, followed by KOH activation. The CNTs were intercalated into the nanoporous graphene layers to build pillared 3D structures, which enhance accessible surface area and allow fast ion diffusion. The resulting graphene/CNT films are free-standing and flexible with a high electrical conductivity of 39 400 S m-1 and a reasonable mass density of 1.06 g cm-3. The supercapacitors fabricated using these films exhibit an outstanding electrochemical performance in an ionic liquid electrolyte with a maximum energy density of 117.2 Wh L-1 or 110.6 Wh kg-1 at a maximum power density of 424 kW L-1 or 400 kW kg-1, which is based on thickness or mass of total active material
URI
https://pr.ibs.re.kr/handle/8788114/1787
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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