Sodium ion based supercapacitor development with high capacity and stability

•High energy of 117 Wh/kg and power density of 12 kW/kg.•Active nanomaterials used for both anode and cathode are MWCNT, cellulose, sulphur as enhancer.•Effective intercalation and deintercalation of sodium from MWCNT, similar to mesoporous carbons.•Good redox stability in cyclic voltammetry of upto...

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Bibliographic Details
Published in:Materials letters 2022-04, Vol.313, p.131767, Article 131767
Main Authors: George, Raji, Subramanian, K.R.V., Jan, Fiza, Allu, Sidhardha
Format: Article
Language:English
Subjects:
Carbon nanotubes
Cellulose
Electrode materials
Energy storage
Energy storage and conversion
Flux density
Graphene
Lithium ions
Materials science
Multi wall carbon nanotubes
Nanocomposites
Nanomaterials
Separators
Sodium
Stability
Supercapacitors
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Summary:•High energy of 117 Wh/kg and power density of 12 kW/kg.•Active nanomaterials used for both anode and cathode are MWCNT, cellulose, sulphur as enhancer.•Effective intercalation and deintercalation of sodium from MWCNT, similar to mesoporous carbons.•Good redox stability in cyclic voltammetry of upto 30 cycles. Sodium ion based supercapacitors have great potential to replace Li-ion based systems in future energy storage devices with advantages of power density, stability and cost, but with a demerit of low energy density achievable. We developed sodium ion based supercapacitor devices with high energy and power density and cyclic stability using nanomaterials for the electrodes and enhancers in the electrolyte. The cathode material was composed of NaCl salt, MWCNT (multi-walled carbon nanotubes), sulphur and cellulose, with compatible anode composition. The supercapacitor device was assembled as two electrode with collector as graphene sheet and cellulose as separator. CV (cyclic voltammetry) curves were acquired using potentiostat-galvanostat at 0.1 V/s (Model: CHN). A specific capacitance of 14.6F/g, high energy density of 117 Wh/kg, a power density of 12 kW/kg and good cyclic stability over 30 redox cycles was achieved.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2022.131767