Journal
ACS ENERGY LETTERS
Volume 4, Issue 7, Pages 1602-1609Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00983
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Funding
- Department of Science and Technology, Government of India [IFA-14 MS-32]
- UKRI Global Challenge Research Fund Project, SUNRISE [EP/P032591/1]
- Jamsetji Tata Trust
- EPSRC [EP/P032591/1] Funding Source: UKRI
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Charge-storage mechanism of free-standing MoS2/r-GO (r-GO = reduced graphene oxide) hybrid nanoflakes on molybdenum (Mo) foil in Na2SO4 solution is elucidated for realizing a high-performance asymmetric supercapacitor (ASC). Thiourea that acts primarily as sulfur source also helps intercalating ammonium ions, which along with r-GO facilitate in situ exfoliation of MoS2, producing hierarchical MoS2 with expanded interlayer spacing. This interlayer expansion in MoS2 facilitates Nations intercalation/deintercalation and ensures enhanced capacitance, rate capability, and cycling stability of the capacitor. Besides exhibiting attractive energy-cum-power traits, the 2 V MoS2/r-GO//Fe2O3/MnO2 ASC shows compelling cycling performance for over 20 000 cycles in an aqueous electrolyte.
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