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Hierarchical Manganese–Iron-Layered Double Hydroxide Nanosheets for Asymmetric Supercapacitors

Author

Listed:
  • Dipali S. Patil

    (Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea)

  • Sachin A. Pawar

    (Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea)

  • Hyo Jin Kim

    (Korea Photonics Technology Institute, Buk-gu, Gwangju 61007, Korea)

  • Jae Cheol Shin

    (Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea)

Abstract

This work presents a synthesis of hierarchical manganese–iron-layered double hydroxide (MnFe-LDH) nanostructured electrodes using the hydrothermal synthesis route by varying the reaction time for electrochemical energy storage applications. The electrochemical behavior of the MnFe-LDH electrodes synthesized at different reaction times was analyzed in a three-electrode cell configuration using 2 M KOH electrolyte. The uniform and well-organized MnFe-LDH nanosheet electrode (MnFe-12h) showed the maximum areal capacitance of 2013 mFcm −2 at a 5 mVs −1 scan rate, and 1886 mFcm −2 at a 25 mA applied current. Furthermore, the electrochemical behavior of MnFe-12h was examined by assembling an asymmetric cell device using activated carbon (AC) as a negative electrode and MnFe-12h as a positive electrode and it was tested in a wide voltage window range of 0.0 to 1.6 V. This asymmetric cell device achieved an appropriate energy density of 44.9 µW h cm −2 (55.01 W h kg −1 ), with a power density of 16 mW cm −2 (5000 W kg −1 ) at an applied current of 10 mA, and had a long-term cycling stability (93% capacitance retention after 5000 cycles) within the 1.6 V operating voltage window.

Suggested Citation

  • Dipali S. Patil & Sachin A. Pawar & Hyo Jin Kim & Jae Cheol Shin, 2020. "Hierarchical Manganese–Iron-Layered Double Hydroxide Nanosheets for Asymmetric Supercapacitors," Energies, MDPI, vol. 13(18), pages 1-14, September.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4616-:d:409173
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