In-situ sputtered 2D-MoS 2 nanoworms reinforced with molybdenum nitride towards enhanced Na-ion based supercapacitive electrodes

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Abstract
We report the fabrication of binder-free, low-cost and efficient hybrid supercapacitive electrode based on the hexagonal phase of two-dimensional MoS 2 nanoworms reinforced with molybdenum nitride nanoflakes deposited on stainless steel (SS) substrate using reactive magnetron sputtering technique. The hybrid nanostructured MoS 2 –Mo 2 N/SS thin film working electrode delivers a high gravimetric capacitance (351.62 F g −1 at 0.25 mA cm −2 ) investigated in 1 M Na 2 SO 4 aqueous solution. The physisorption/intercalation of sodium (Na + ) ions in electroactive sites of MoS 2 –Mo 2 N composite ensures remarkable electrochemical performance. The deposited porous nanostructure with good electrical conductivity and better adhesion with the current collector demonstrates a high-energy density of 82.53 Wh kg −1 in addition to a high-power density of 24.98 kW kg −1 . Further, excellent capacitance retention of 93.62% after 4000 galvanostatic charge–discharge cycles elucidated it as a promising candidate for realizing high-performance supercapacitor applications.
Funding Information
  • Anusandhan National Research Foundation (CRG/2020/005265)
  • Defence Research and Development Organisation (ERIP/ER/99011650/M/01/1739 (G))

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