Journal
NEW JOURNAL OF CHEMISTRY
Volume 44, Issue 25, Pages 10359-10366Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj00235f
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Funding
- National Natural Science Foundation of China [21871156]
- Zhejiang Provincial Natural Science Foundation of China [LY18B010004]
- Natural Science Foundation of Ningbo [2018A610066]
- Zhejiang Provincial Education Foundation of China [Y201737172]
- Open Funds of the State Key Laboratory of Rare Earth Resource Utilization [RERU2018016]
- K. C. Wong Magna Fund in Ningbo University
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In this study, a series of NiCoxFe1-x-PBA/NF (nickel foam) electrodes were successfully fabricated with different ratios of Co and Fe through anin situchemical etching process. Their structures and morphology were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Remarkably, this novel series of composites exhibit excellent supercapacitor performance. Among them, the NiCo-PBA/NF electrode exhibits the best electrochemical performance with an area specific capacitance of 2242 mF cm(-2)at 1 mA cm(-2)in 3 M KOH solution and good cycling stability. Furthermore, asymmetric supercapacitor cells with NiCo-PBA/NF as the positive electrode and active carbon coated on the nickel foam as the negative electrode deliver a very high energy density of 39.4 W h kg(-1)and a high power density of 4003 W kg(-1), which far exceed those of other devices reported previously. This work highlights the designing strategy of such composite materials with an optimized synergistic effect, which greatly promotes the supercapacitor development.
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