Ultrasound-assisted facile one-pot synthesis of ternary MWCNT/MnO2/rGO nanocomposite for high performance supercapacitors with commercial-level mass loadings |
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Institution: | 1. School of Energy Science and Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India;2. Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India |
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Abstract: | Commercial application of supercapacitors (SCs) requires high mass loading electrodes simultaneously with high energy density and long cycle life. Herein, we have reported a ternary multi-walled carbon nanotube (MWCNT)/MnO2/reduced graphene oxide (rGO) nanocomposite for SCs with commercial-level mass loadings. The ternary nanocomposite was synthesized using a facile ultrasound-assisted one-pot method. The symmetric SC fabricated with ternary MWCNT/MnO2/rGO nanocomposite demonstrated marked enhancement in capacitive performance as compared to those with binary nanocomposites (MnO2/rGO and MnO2/MWCNT). The synergistic effect from simultaneous growth of MnO2 on the graphene and MWCNTs under ultrasonic irradiation resulted in the formation of a porous ternary structure with efficient ion diffusion channels and high electrochemically active surface area. The symmetric SC with commercial-level mass loading electrodes (~12 mg cm?2) offered a high specific capacitance (314.6 F g?1) and energy density (21.1 W h kg?1 at 150 W kg?1) at a wide operating voltage of 1.5 V. Moreover, the SC exhibits no loss of capacitance after 5000 charge?discharge cycles showcasing excellent cycle life. |
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Keywords: | Supercapacitors Ultrasound Energy density Graphene Carbon nanotubes Manganese oxide |
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