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Electrostatic-induced assembly of graphene-encapsulated carbon@nickel−aluminum layered double hydroxide core−shell spheres hybrid structure for high-energy and high-power-density asymmetric supercapacitor
Wu S.; Hui K.S.; Hui K.N.; Kim K.H.
2017
Source PublicationACS Applied Materials and Interfaces
ISSN19448244
Volume9Issue:2Pages:1395
AbstractAchieving high energy density while retaining high power density is difficult in electrical double-layer capacitors and in pseudocapacitors considering the origin of different charge storage mechanisms. Rational structural design became an appealing strategy in circumventing these tradeoffs between energy and power densities. A hybrid structure consists of chemically converted graphene-encapsulated carbon@nickel−aluminum layered double hydroxide core−shell spheres as spacers among graphene layers (G-CLS) used as an advanced electrode to achieve high energy density while retaining high power density for high-performance supercapacitors. The merits of the proposed architecture are as follows: (1) CLS act as spacers to avoid the close restacking of graphene; (2) highly conductive carbon sphere and graphene preserve the mechanical integrity and improve the electrical conductivity of LDHs hybrid. Thus, the proposed hybrid structure can simultaneously achieve high electrical double-layer capacitance and pseudocapacitance resulting in the overall highly active electrode. The G-CLS electrode exhibited high specific capacitance (1710.5 F g−1 at 1 A g−1) under three-electrode tests. An ASC fabricated using the G-CLS as positive electrode and reduced graphite oxide as negative electrode demonstrated remarkable electrochemical performance. The ASC device operated at 1.4 V and delivered a high energy density of 35.5 Wh kg−1 at a 670.7 W kg−1 power density at 1 A g−1 with an excellent rate capability as well as a robust long-term cycling stability of up to 10 000 cycles. © 2016 American Chemical Society.
KeywordAsymmetric supercapacitor Carbon sphere Electrostatic assembly Graphene Nickel−aluminum layered double hydroxide
DOI10.1021/acsami.6b09355
URLView the original
Language英语
The Source to ArticleScopus
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Cited Times [WOS]:39   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
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Wu S.,Hui K.S.,Hui K.N.,et al. Electrostatic-induced assembly of graphene-encapsulated carbon@nickel−aluminum layered double hydroxide core−shell spheres hybrid structure for high-energy and high-power-density asymmetric supercapacitor[J]. ACS Applied Materials and Interfaces,2017,9(2):1395.
APA Wu S.,Hui K.S.,Hui K.N.,&Kim K.H..(2017).Electrostatic-induced assembly of graphene-encapsulated carbon@nickel−aluminum layered double hydroxide core−shell spheres hybrid structure for high-energy and high-power-density asymmetric supercapacitor.ACS Applied Materials and Interfaces,9(2),1395.
MLA Wu S.,et al."Electrostatic-induced assembly of graphene-encapsulated carbon@nickel−aluminum layered double hydroxide core−shell spheres hybrid structure for high-energy and high-power-density asymmetric supercapacitor".ACS Applied Materials and Interfaces 9.2(2017):1395.
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