Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 5, Pages 2291-2300Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta11249e
Keywords
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Funding
- National Key R&D Program of China [2016YFA0401801, 2014CB931704]
- Natural Science Foundation of Anhui Province [1608085QE107]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH015]
- Youth Innovation Promotion Association of CAS [2014283]
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An energy storage system based on a battery-type electrode and a capacitive electrode as a hybrid supercapacitor offers a promising way to construct devices with advantages of both rechargeable batteries and carbon-based supercapacitors. NiCoAl-LDH nanosheets uniformly grow onto micron-scaled MXene sheets to form a NiCoAl-LDH/V4C3Tx heterostructure with three-dimensional interconnected porous network microstructures by a hydrothermal method. NiCoAl-LDH/V4C3Tx composite electrodes show an excellent specific capacity of 627 C g(-1) at a current density of 1 A g(-1) in 1 M KOH. Especially, the NiCoAl-LDH/V4C3Tx electrodes exhibit a specific capacity of 300 C g(-1) even at a high current density of 20 A g(-1) in 1 M KOH, showing excellent rate performance. Hybrid supercapacitors, constructed with NiCoAl-LDH/V4C3Tx as the battery-type electrode and activated carbon (AC) as the capacitive electrode, show superior energy densities of 71.7 and 45.0 W h kg(-1) at power densities of 830 and 20 000 W kg(-1) in 1 M KOH, respectively. The excellent capacity retention rate is 98% for the hybrid device after 10 000 cycles at 20 A g(-1) in 1 M KOH. The NiCoAl-LDH/V4C3Tx heterostructures can be used as promising electrode materials for low-cost hybrid supercapacitor devices.
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