Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 9, Pages 8679-8690Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c01419
Keywords
zinc-nickel-cobalt oxide; flowerlike superstructure; rate capability; asymmetric device; energy density
Funding
- National Research Foundation of Korea (NRF) - Korean Government (MSIT) [2020R1A2C2012356]
- National Research Foundation of Korea [2020R1A2C2012356] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, hydrolysis agent-assisted three-dimensional (3D) flowerlike hierarchical zinc-nickel-cobalt oxide (ZNCO) nanostructured materials, which consist of two-dimensional (2D) ZNCO nanosheets anchored with one-dimensional (1D) ZNCO nanowire architectures, as binder-free electrodes for ultrahigh-rate supercapacitor applications are directly fabricated on Ni foam via a facile hydrothermal method followed by calcination. The morphologies of the as-fabricated flowerlike 3D hierarchical ZNCO nanostructures dramatically depend on the combination method (urea, hexamethylenetetramine, hexamethylenetetramine-urea) of the hydrolysis reagents used, which are denoted ZNCO-U, ZNCO-H, and ZNCO-HU, respectively. Among them, the as-prepared ZNCO-HU electrode shows outstanding electrochemical performance with a higher specific capacity of 259.8 mAh g(-1) at 1 A g(-1), ultrahigh capacitance retention of 83.9% at a higher current density of 50 A g(-1), and remarkable long cycle stability over 5000 cycles. The assembled asymmetric supercapacitor (ASC) device using ZNCO-HU as the cathode and N-doped graphene hydrogel (NGH) as the anode materials delivers a noticeable specific capacity of 76.5 mAh g(-1) at 1 A g(-1) and good rate capability of 69.65% at 10 A g(-1). The sandwiched ASC displays a superior energy density of 55.4 Wh kg(-1) at a power density of 761.5 W kg(-1) and excellent capacity retention of 89% up to 5000 cycles.
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