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Indirect nanoconstruction morphology of Ni3S2 electrodes renovates the performance for electrochemical energy storage

journal contribution
posted on 2018-12-24, 00:00 authored by Donggun Kim, P Karthick Kannan, Srikanth MatetiSrikanth Mateti, C H Chung
Asymmetric supercapacitors with positive electrodes based on transition metal sulfides show high specific capacitance with higher energy density than that of carbon-based supercapacitors, which suffer from low electrochemical stability because of poor conductivity of the electroactive materials and high reliance on faradaic redox reactions. In this work, the unfavorable redox reaction kinetics of nickel sulfides (Ni 3 S 2 ) is compensated by fabricating a highly porous Ni current collector. The as-prepared Ni 3 S 2 electrodes show a high specific capacity of 786.5 C g -1 at a current density of 10 mA cm -2 with high rate capability due to their continuous electronic conduction channels supported by the porous Ni frame. An asymmetric full-cell supercapacitor is fabricated using Ni 3 S 2 as a positive electrode and activated carbon (AC) as a negative electrode, showing a high energy density of 39.7 W h kg -1 at a power density of 833 W kg -1 . Moreover, a 93.9% specific capacitance is retained even after 6000 cycles, indicating the excellent stability of the cell.

History

Journal

ACS applied energy materials

Volume

1

Issue

12

Pagination

6945 - 6952

Publisher

American Chemical Society

Location

Washington, D.C.

eISSN

2574-0962

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, American Chemical Society