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Phosphidated Ni-Mn layered double hydroxide–based electrode material with superior electrochemical performance for supercapacitors

Journal of Energy Storage, ISSN: 2352-152X, Vol: 44, Page: 103311
2021
  • 20
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  • 17
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    20
    • Citation Indexes
      20
  • Captures
    17

Article Description

Layered double hydroxides (LDHs) exhibit excellent electrochemical performance in alkali solutions. However, their low conductivity and poor cycle stability limit their application. In this work, Ni-Mn LDH was grown on activated carbon nanofibers (ACNFs) and then phosphidated to obtain an electrode material with a three-dimensional core–shell structure (ACNFs@Ni-Mn-P). This composite combines the electrochemical activity of the two-dimensional phosphidated nanosheets with the structural stability of the one-dimensional nanofibers. The resulting ACNFs@Ni-Mn-P electrode exhibits a high specific capacitance of 1077 F g −1 at 1 A g −1, which is 4.9 times higher than that of a non-phosphidated ACNFs@Ni-Mn LDH electrode, and retains stability of 88.53% at a high current density of 10 A g −1 even after 5000 cycles. Moreover, an asymmetrical supercapacitor featuring an ACNFs@Ni-Mn-P positive electrode achieves comparatively prominent specific energy of 56.25 Wh kg −1 at 806.13 W kg −1, respectively. Therefore, ACNFs@Ni-Mn-P as electrode material has great potential for application in supercapacitors.

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