Robust method for uniform coating of carbon nanotubes with V2O5 for next-generation transparent electrodes and Li-ion batteries
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-08-30
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en
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11
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RSC Advances, Volume 13, issue 37, pp. 25817-25827
Abstract
Composites comprising vanadium-pentoxide (V2O5) and single-walled carbon nanotubes (SWCNTs) are promising components for emerging applications in optoelectronics, solar cells, chemical and electrochemical sensors, etc. We propose a novel, simple, and facile approach for SWCNT covering with V2O5 by spin coating under ambient conditions. With the hydrolysis-polycondensation of the precursor (vanadyl triisopropoxide) directly on the surface of SWCNTs, the nm-thick layer of oxide is amorphous with a work function of 4.8 eV. The material recrystallizes after thermal treatment at 600 °C, achieving the work function of 5.8 eV. The key advantages of the method are that the obtained coating is uniform with a tunable thickness and does not require vacuuming or heating during processing. We demonstrate the groundbreaking results for two V2O5/SWCNT applications: transparent electrode and cathode for Li-ion batteries. As a transparent electrode, the composite shows stable sheet resistance of 160 Ω sq−1 at a 90% transmittance (550 nm) - the best performance reported for SWCNTs doped by metal oxides. As a cathode material, the obtained specific capacity (330 mA h g−1) is the highest among all the other V2O5/SWCNT cathodes reported so far. This approach opens new horizons for the creation of the next generation of metal oxide composites for various applications, including optoelectronics and electrochemistry.Description
Funding Information: The work was supported by RFBR grant number: 20-33-90324 (electrochemical measurements of SWCNTs) and by RSF grant number: 22-13-00436 (synthesis and doping of SWCNTs). The work was supported by the Council on Grants (number HIII-1330.2022.1.3). We also thank Business Finland for funding the work (the NextGenBat project no. 211849). Additionally, the OtaNano-Nanomicroscopy Center (Aalto-NMC) and Raw Materials Infrastructure (RAMI) were utilized as a part of this research. Publisher Copyright: © 2023 The Royal Society of Chemistry.
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Ilatovskii, D A, Krasnikov, D V, Goldt, A E, Mousavihashemi, S, Sainio, J, Khabushev, E M, Alekseeva, A A, Luchkin, S Y, Vinokurov, Z S, Shmakov, A N, Elakshar, A, Kallio, T & Nasibulin, A G 2023, ' Robust method for uniform coating of carbon nanotubes with V 2 O 5 for next-generation transparent electrodes and Li-ion batteries ', RSC Advances, vol. 13, no. 37, pp. 25817-25827 . https://doi.org/10.1039/d3ra04342h