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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 ChungAsymmetric 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 materialsVolume
1Issue
12Pagination
6945 - 6952Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
eISSN
2574-0962Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, American Chemical SocietyUsage metrics
Categories
No categories selectedKeywords
nickel sulfidecurrent collectorelectrodepositionsupercapacitorenergy storageScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalEnergy & FuelsMaterials Science, MultidisciplinaryChemistryMaterials ScienceHYDROTHERMAL SYNTHESISSULFIDE NANOWIRESCATHODE MATERIALTHIN-FILMSNANOSTRUCTUREDEPOSITIONDENDRITESEVOLUTIONBEHAVIOR