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CNT assisted anomalous Li+ transport in CS/CMC solid biopolymer nanocomposite: an electrolyte in hybrid solid-state supercapacitors

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Abstract

A conducting biodegradable solid polymer nanocomposite electrolyte (conductivity of the order ~ 10−3 S/cm) comprising of the blend of chitosan (CS) and carboxymethyl cellulose (CMC), plasticized with glycerol, lithium perchlorate (LiClO4) as dopant salt, and carbon nanotube (CNT) as nanofiller, has been prepared. The ion dynamics and charge carrier relaxation properties in CNT-incorporated solid biopolymer nanocomposite electrolytes are studied. The scaling of the conductivity and permittivity spectra is performed to study the effect of dopant composition on the relaxation mechanism. The anomalous intra-diffusive behavior of the charge carriers inside the blended polymer matrix has been investigated based on the fractional diffusion model. FTIR spectroscopy results suggest that the secondary amide functional groups of chitosan dominate the conduction mechanism. Transference number analysis confirms the predominant ionic conduction in the CNT-incorporated CS/CMC blended solid nanocomposite electrolytes. A very low leakage current of ~ 6 µA has been obtained with the CNT-incorporated solid nanocomposite electrolyte which makes it attractive for energy storage applications. A symmetric hybrid solid-state supercapacitor has been fabricated with active carbon and nanocrystallites of manganese cobalt ferrite (MnCoFeO4) as electrode materials and CNT-incorporated CS/CMC blended biopolymers as solid-state nanocomposite electrolyte, offering a fairly good effective specific capacitance of ~ 94 Fg−1.

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Acknowledgements

Simantini Majumdar (S.M) acknowledges JU-RUSA 2.0 (Ref. No. R-11/195/2019) for the research fellowship to carry out this research work. Ruma Ray (R.R.) would like to thank DHESTBT, Government of West Bengal (Project No. 426(Sanc.)/ST/P/S&T/16G-16/2018), and JU-RUSA 2.0 Major Research Support (Project No. R-11/468/19) for providing the financial support. The authors would like to express their gratitude to Mr. Samir Chattopadhyay of IACS, Kolkata, for rendering the facility of FTIR spectroscopy. The authors would also like to thank Dr. Kaustav Das (Department of Physics, Jadavpur University) and Mr. Bijoy Jana for rendering the facility of the Keithley source meter. The authors would like to thank DST, Govt. of India, for developing FE-SEM instrumental facility (JEOL, JSM-7610F) under the FIST programme at Jadavpur University.

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Authors and Affiliations

  1. Department of Physics, Jadavpur University, Kolkata, 700032, India

    Simantini Majumdar & Ruma Ray

  2. Materials Science Studies Division, Variable Energy Cyclotron Centre, HBNI, 1/AF, Bidhannagar, Kolkata, 700064, India

    Pintu Sen

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  1. Simantini Majumdar
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  2. Pintu Sen
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Correspondence to Ruma Ray.

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Majumdar, S., Sen, P. & Ray, R. CNT assisted anomalous Li+ transport in CS/CMC solid biopolymer nanocomposite: an electrolyte in hybrid solid-state supercapacitors. Ionics 28, 1403–1418 (2022). https://doi.org/10.1007/s11581-021-04389-z

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