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ACS applied materials & interfaces v.9 no.2, 2017년, pp.1395 - 1406   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

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, Shuxing (Department of Materials Science and Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, ); Hui, Kwan San (School of Mathematics, University of East Anglia, Norwich NR4 7TJ, ); Hui, Kwun Nam (Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Macau, ); Kim, Kwang Ho (Department of Materials Science and Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, );
  • 초록  

    Achieving 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-encapsiilated 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. 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.


  • 주제어

    asymmetric supercapacitor .   graphene .   carbon sphere .   nickel−aluminum layered double hydroxide .   electrostatic assembly.  

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