Alkaline Iodide-Based Deep Eutectic Solvents for Electrochemical Applications

Hugo Cruz; Noémi Jordão; Ana Lúcia Pinto; Madalena Dionísio; Luísa A. Neves; Luís C. Branco

doi:10.1021/acssuschemeng.9b06733

Alkaline Iodide-Based Deep Eutectic Solvents for Electrochemical Applications

Hugo Cruz, Noémi Jordão, Ana Lúcia Pinto, Madalena Dionísio, Luísa A. Neves, Luís C. Branco

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

Deep eutectic solvents (DES) composed of lithium, sodium, or potassium iodide salts in suitable combination with ethylene glycol (EG), glycerol (Gly), or polyethylene glycol (PEG) have been developed. All prepared DES were characterized by thermal analysis (DSC and TGA) and its complex conductivity (σ*) and impedance (Z*) frequency were evaluated through dielectric relaxation spectroscopy (DRS). Two- and three-electrode electrochemical studies of all DES have been performed. All DES avoid crystallization, exhibiting conductivity values in a range from 10-4 to 10-2 S cm-1 at room temperature and electrochemical windows higher than 1 V (on the order of 3-4 V), fulfilling the usual suitability criteria for utilization in electrochromic devices (ECD). The most promissory DES as electrolytes were tested for ECD. Being suitable candidates for further application in batteries.

Original language	English
Pages (from-to)	10653-10663
Number of pages	11
Journal	ACS Sustainable Chemistry and Engineering
Volume	8
Issue number	29
DOIs	https://doi.org/10.1021/acssuschemeng.9b06733
Publication status	Published - 27 Jul 2020

Keywords

Deep eutectic solvents (DES)
Dielectric relaxation spectroscopy (DRS)
Electrochromic devices (ECD)
Electrochromism
Electrolytes
Stimuli-responsive materials
Thermal analysis

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10.1021/acssuschemeng.9b06733

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title = "Alkaline Iodide-Based Deep Eutectic Solvents for Electrochemical Applications",

abstract = "Deep eutectic solvents (DES) composed of lithium, sodium, or potassium iodide salts in suitable combination with ethylene glycol (EG), glycerol (Gly), or polyethylene glycol (PEG) have been developed. All prepared DES were characterized by thermal analysis (DSC and TGA) and its complex conductivity (σ*) and impedance (Z*) frequency were evaluated through dielectric relaxation spectroscopy (DRS). Two- and three-electrode electrochemical studies of all DES have been performed. All DES avoid crystallization, exhibiting conductivity values in a range from 10-4 to 10-2 S cm-1 at room temperature and electrochemical windows higher than 1 V (on the order of 3-4 V), fulfilling the usual suitability criteria for utilization in electrochromic devices (ECD). The most promissory DES as electrolytes were tested for ECD. Being suitable candidates for further application in batteries.",

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AU - Neves, Luísa A.

AU - Branco, Luís C.

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