Journal
SURFACES AND INTERFACES
Volume 30, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.surfin.2022.101978
Keywords
Ternary hybrid; Energy storage; Electrochemistry; DFT; Quantum capacitance
Categories
Funding
- SERB, New Delhi, India [EMR-2016-003074]
- Deanship of Scientific Research at King Khalid University Saudi Arabia [R.G. P. 2/40/43]
- Bharathidasan University, Tiruchirappalli, India [05441/URF/K7/2013]
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In this study, a ternary hybrid of multiwalled carbon nanotubes/SnO2/polyaniline (MSP) was synthesized for energy storage application. Various characterization studies confirmed the formation of the ternary hybrid, which exhibited excellent electrochemical performance.
In the present work, we report synthesis of ternary hybrid of multiwalled carbon nanotubes/SnO2/polyaniline (MSP) for energy storage application. The various characterization studies such as X-ray diffraction (XRD-structural confirmation), Transmission electron microscopy (TEM-morphology), Fourier transform infrared microscopy (FTIR) and Raman (molecular confirmation), and X-ray photoelectron microscopy (XPS-elemental and oxidation state) confirm the ternary hybrid formation. Three-electrode system with the use of 1 M H2SO4 electrolyte reveals the electrochemical performance of the ternary hybrid. The MSP electrode demonstrates the specific capacitance value of 221 F g(-1) at the current density of 2 A g(-1). Also, it shows outstanding capacitance retention (95%) with 100% coulombic efficiency for 1000 charge/discharge cycles. From Density Functional Theory (DFT) simulations, enhancement of electronic states near Fermi level and increment of quantum capacitance for the ternary hybrid justifies the experimental enhancement of charge storage performance of MSP. The interactions between polyaniline (PANI) and carbon nanotubes /SnO2 involves charge transfer from H 1s and N 2p orbitals of PANI to C 2p orbital of carbon nanotubes.
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