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Ionic liquids to monitor the nano-structuration and the surface functionalization of material electrodes: a proof of concept applied to cobalt oxyhydroxide

Abstract

This paper reports on an innovative and efficient approach based on the use of ionic liquids to govern the nano-structuration of HCoO2, in order to optimize the porosity and enhance the ionic diffusion through the electrode materials. In this work, we show that the (1-pentyl-3-methyl-imidazoilium bromide (PMIMBr) and 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4)) ionic liquids (ILs) used as template during the synthesis orientate the nanoparticles aggregation which leads to increase the porosity and the average pore size of the electrode material. It is also demonstrated that the ILs are strongly bonded to HCoO2 surface, leading to surface functionalized HCoO2 materials, also called nanohybrids. This surface tailoring stabilizes the material upon cycling and shifts the oxidation potential linked to the Co(III)/Co(IV) redox couple to lower voltage in alkaline 5M KOH electrolyte. The surface and porosity optimizations facilitate the ionic diffusion through the material, improve the electron transfer ability within the electrode and lead to greatly enhance the specific capacity in both alkaline 5M-KOH and neutral 0.5M-K2SO4 aqueous electrolyte (66.7 mAh/g and 47.5 mAh/g respectively for HCoO2-PMIMBr and HCoO2-EMIMBF4 compared to 18.1 mAh/g for the bare HCoO2 in 5M-KOH at 1 A/g).

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Publication details

The article was accepted on 09 Apr 2019 and first published on 10 Apr 2019


Article type: Paper
DOI: 10.1039/C9NA00171A
Citation: Nanoscale Adv., 2019, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Ionic liquids to monitor the nano-structuration and the surface functionalization of material electrodes: a proof of concept applied to cobalt oxyhydroxide

    J. Olchowka, T. Tailliez, L. Bourgeois, M. Dourges and L. Guerlou-Demourgues, Nanoscale Adv., 2019, Accepted Manuscript , DOI: 10.1039/C9NA00171A

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