Analysis of mass transport in ionic liquids: a rotating disk electrode approach
| Autor: | Giaccherini A.[1, Al Khatib M.[3], Cinotti S.[2], Piciollo E.[4], Berretti E.[5], Giusti P.[6], Innocenti M.[2], Montegrossi G.[7], Alessandro Lavacchi A.[5] |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Convection Materials science lcsh:Medicine Electrolyte Article 03 medical and health sciences chemistry.chemical_compound Chemical engineering 0302 clinical medicine Electrochemistry Rotating disk electrode lcsh:Science Ohmic contact Multidisciplinary Drop (liquid) lcsh:R mass transport Finite element method Ionic liquids 030104 developmental biology chemistry Chemical physics Rotating Disk Electrode (RDE) Ionic liquid lcsh:Q 030217 neurology & neurosurgery Electrochemical window |
| Zdroj: | Scientific Reports Scientific Reports, Vol 10, Iss 1, Pp 1-9 (2020) Scientific reports (Nature Publishing Group) 10 (2020): 1–9. doi:10.1038/s41598-020-70301-w info:cnr-pdr/source/autori:Giaccherini A.[1,2], Al Khatib M.[3], Cinotti S.[2], Piciollo E.[4], Berretti E.[5], Giusti P.[6], Innocenti M.[2], Montegrossi G.[7],Alessandro Lavacchi A.[5]/titolo:Analysis of mass transport in ionic liquids: a rotating disk electrode approach/doi:10.1038%2Fs41598-020-70301-w/rivista:Scientific reports (Nature Publishing Group)/anno:2020/pagina_da:1/pagina_a:9/intervallo_pagine:1–9/volume:10 |
| ISSN: | 2045-2322 |
| Popis: | Ionic Liquids are a promising alternative to water electrolytes for the electrodeposition of metals. These solvents have a much larger electrochemical window than water that expands the potential of electrodeposition. However, mass transport in Ionic Liquids is slow. The slow mass transport dramatically affects the rate of reactions at the solid–liquid interface, hampering the exploitation of Ionic Liquids in high-throughput electrodeposition processes. In this paper, we clarify the origin of such poor mass transport in the diffusion–advection (convection) regime. To determine the extent and the dynamics of the convection boundary layers, we performed Rotating Disk Electrode (RDE) experiments on model reactions along with the finite element simulation. Both the experiments and the finite element modelling showed the occurrence of peaks in the RDE curves even at relatively high rotation rates (up to 2000 rpm). The peak in the RDE is the fingerprint of partial diffusion control that happens for the relative extent of the diffusion and convection boundary layers. In looking for a close match between the experiments and the simulations, we found that the ohmic drop plays a critical role and must be considered in the calculation to find the best match with the experimental data. In the end, we have shown that the combined approach consisting of RDE experiments and finite elements modelling providing a tool to unravel of the structure of the diffusion and convection boundary layers both in dynamic and stationary conditions. |
| Databáze: | OpenAIRE |
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