Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 18, Pages 15510-15524Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b02987
Keywords
hybrid supercapacitor; NiCo-LDH nanosheets; binder-free; flexible; carbon fiber cloth; atomic thickness
Funding
- Queensland University of Technology (QUT) for Postgraduate Research Award scholarships (QUTPRA)
- Science and Engineering Faculty (QUT)
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A new method based on one-step solvothermal reaction is demonstrated to synthesize ultrathin Ni-Co layered double hydroxide (LDH) nanosheets, which grow directly on a flexible carbon fiber cloth (NiCo-LDH/CFC). Through using 2-methylimidazole as complex and methanol as solvent, the as-prepared NiCo-LDH/CFC shows a (003) facet preferential growth and an expanded interlayer spacing structure, resulting in a unique 3D porous nanostructure with a thickness of nanosheets of around 5-7 nm that shows high energy storage performance. By controlling the ratio of Ni/Co = 4:1 in the precursor solution, the electrode shows a specific capacitance of 2762.7 F g(-1) (1243.2 g(-1)) at a current density of 1 A g(-1). Nevertheless, the optimal composition is obtained with Ni/Co = 1:1, which produces a specific capacitance of 2242.9 F g(-1) (1009.3 C g(-1)) at 1 A g(-1) and shows an excellent rate capability with 61% of the original capacitance being retained at a current density of 60 A g(-1). The hybrid supercapacitor (HSC) based on the NiCoLDH/CFC exhibits a maximum energy density of 59.2 Wh kg(-1) and power densities of 34 kW kg(-1), respectively. Long-term stability test shows that 82% of the original capacitance of the HSC remains after 5000 cycles. Importantly, the electrochemical performance of the solid-state flexible supercapacitors based on the prepared NiCo-LDH/CFC electrode showed a negligible change when the device was bent up to 180. The performance of synthesized NiCo-LDH/CFC indicates the great potential of the material for delivering both high energy density and high power density in energy storage devices.
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