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

Dipali S. Patil, Sachin A. Pawar, Hyo Jin Kim and Jae Cheol Shin
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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

Energies, 2020, vol. 13, issue 18, 1-14

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.

Keywords: MnFe; layered double hydroxide; asymmetric supercapacitor; hydrothermal (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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