Journal
NANO ENERGY
Volume 50, Issue -, Pages 448-461Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.05.063
Keywords
Bilayered nanoarchitectures; Redox chemistry; Areal capacity; Energy density; Hybrid supercapacitor; Self-charging station
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2017R1A2B4011998, 2017H1D8A2031138]
- National Research Foundation of Korea [2017H1D8A2031138] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An essential key to enhance the redox chemistry of battery-type materials is to construct rational design of nanoarchitectures with high electrochemical activity. Herein, we reported a hierarchical composite consisting of bilayered nickel hydroxide carbonate nanoplates-decorated nanoflowers on nickel foam (NHC NPs@NFs/Ni foam) via a facile homogeneous precipitation method for use as an effective cathode in hybrid supercapacitors (HSCs). Under controlled growth time (4 h), the bilayered NHC NPs@NFs with hierarchical alignment were spontaneously crystallized on Ni foam. The as-preapared hybrid structure greatly enhanced the electroactive surface area and enabled the rapid redox chemistry in alkaline electrolyte. Notably, the hybrid NHC NPs@NFs/Ni foam delivered a maximum areal capacity of 727.4 mu Ah/cm(2) at 2 mA/cm(2) and it is relatively higher than its oxide form (76.6 mu Ah/cm(2)) in a three-electrode system. Also, a pouch-type HSC with bilayered NHC NPs@NFs/Ni foam and porous carbon electrodes was fabricated, which demonstrated superior energy storage performance in terms of capacitance (1445.8 mF/cm(2)), energy density (0.506 mWh/cm(2)), power density (35.675 mW/cm(2)) and cycling stability (89.4%). Furthermore, the self-charging power station consisting of a solar cell for energy conversion and the HSCs for energy storage was also assembled to operate the portable electronic displays and wall clock effectively for long time. This facile approach for the cost-effective fabrication of hierarchically designed nanomaterials paves a path for the development of high-performance hybrid supercapacitors.
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