Electro-insertion of Mn2+ ions into V2O5·nH2O on MWCNTs coated carbon felt for binder-free Na+ ion battery electrodes. Issue 8 (23rd June 2020)

• Record Type: Journal Article
• Authors: Parmar, R.; de Freitas Neto, D. B.; Matsubara, E. Y.; Gunnella, R.; Rosolen, J. M.
• Is Part Of: Sustainable energy & fuels. Volume 4:Issue 8(2020)
• Page Start: 3951
• Page End: 3962
• Publication Date: 2020-06-23
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d0se00571a
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : We report the electrochemical deposition of hydrated and amorphous V2 O5 · n H2 O nanostructures and related Mn 2+ cations insertion during anodic polarization. Abstract : In the present article, we report the electrochemical deposition of hydrated and amorphous V2 O5 · n H2 O nanostructures and related Mn 2+ cations insertion during anodic polarization. The hydrated phase was synthesized on hydrophilic carbon felt substrates coated by defective multiwall carbon nanotubes (MWCNTs). From the combined data of micro-Raman scattering and X-ray photoelectron spectroscopy (XPS), it was possible to see that the Mn 2+ cations were intercalated into V2 O5 under anodic polarization. When MnOOH is inserted between atomic bilayers of V2 O5 · n H2 O (V 5+ ), a 3D complex monoclinic-Mn x V2 O5 system arises. This novel method of Mn doping into V2 O5 · n H2 O/MWCNT produces an amorphous Mn x V2 O5 /MWCNT but without hydration. The resulting binder-free Mn x V2 O5 /MWCNT/felt composite electrode provides remarkable Na + reversible specific capacities of 400 mA h g −1 and 224 mA h g −1 in the 3.5–1.0 V and 3.5–1.5 V ranges, respectively, while the V2 O5 · n H2 O/MWCNT/felt provides only 120 mA h g −1 between the smaller cut-off potential limits. The Mn x V2 O5 /MWCNT nanostructures synthesis onto fibers of graphitic felt does not present a fading capacity during the polarization of 100 discharge/charge cycles.