Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 59, Pages 14839-14847Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201702676
Keywords
graphene; layered double hydroxides; metal-organic frameworks; supercapacitor
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Funding
- National Natural Science Foundation of China [NSFC 61473095]
- Fundamental Research Funds of the Central University (HEUCFM)
- Natural Science Foundation of Heilongjiang Province [B2015021]
- International Science & Technology Cooperation Program of China [2015DFR50050]
- Major Project of Science and Technology of Heilongjiang Province [GA14A101]
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Rational design of a transition metal layered double hydroxide (LDH) and graphene composite is vitally important for designing high-performance supercapacitor electrodes. Although various methods are performed, the realization of high-performance is still impeded by the agglomeration of graphene and layered double hydroxide. Here, metal-organic framework derived cobalt-cobalt layered double hydroxide (Co-Co LDH) hollow nanocages, uniformly deposited on graphene nanosheets, are fabricated through facile in situ co-deposition and thermal ion-exchange reaction. Electrochemical investigation reveals that Co-Co LDH/15mg graphene is rather outstanding, which delivers high specific capacitance of 1205 Fg(-1), excellent rate capability (60.3% capacitance retention is obtained after the current density increased 6.67times), and cycling stability. The excellent performance of electrode is also confirmed by assembling an asymmetric supercapacitor, which delivers high energy density of 49.5 Wh kg(-1) as well as the maximum power density of 7000 W kg(-1). The Co-Co LDH/graphene composite proves a promising concept for constructing hierarchical structure materials in the future.
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