Journal
BATTERIES & SUPERCAPS
Volume 5, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.202200026
Keywords
asymmetric supercapacitor; electrochemistry; energy storage; hydrothermal synthesis
Funding
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of China [21590801]
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Rational construction of heterostructures can compensate for the property shortfalls of a single component. This article reports a unique CuCo carbonate hydroxide nanowires@FeCo-layered double hydroxide hexagonal nanosheets material and demonstrates its superior electrochemical performance.
Rational construction of heterostructures can compensate for the property shortfalls of a single component, which is a promising and challenging approach to develop high-performance electrode materials. Herein, CuCo carbonate hydroxide nanowires@FeCo-layered double hydroxide hexagonal nanosheets (CuCo-CH@FeCo-LDH) with a unique nanowire-penetrated-nanosheet architecture have been prepared through a facile two-step hydrothermal method. The nanowires serve as fast channels for charge transfer of FeCo-LDH and alleviate the blocked electroactive utilization induced by self-stacking of LDH nanosheets, while the FeCo-LDH contributes high specific capacitance. The resultant CuCo-CH@FeCo-LDH exhibits pseudocapacitive behavior with near-rectangular CV profiles and overall enhanced electrochemical performance compared to individual CuCo-CH and FeCo-LDH. An assembled asymmetric supercapacitor (CuCo-CH@FeCo-LDH//N/S co-doped graphene) delivers high energy density (46.9 Wh kg(-1) at 750 W kg(-1)), high power density (29.0 Wh kg(-1) at 7500 W kg(-1)), and outstanding cycling stability (81.7 % capacitance retention after 5000 cycles).
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