Electrochemistry in Ionic Liquids

Brooks, Claudine

doi:10.1149/200219.0900pv

Cited by 5 publications

(5 citation statements)

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“…The introduction of alkyl groups on the C-2 position of this imidazolium ring has improved the electrochemical stability of these resulting compounds and thereby they are becoming very attractive electrolytes for Libatteries [27,30,36,[47][48][49]. In addition to imidazolium salts, cyclic quaternary ammonium TFSIs, such as pyrrolidinium [25,28,29,40,[50][51][52][53][54][55] and piperidinium cations [26,29,50,[56][57][58][59][60] have also been recently employed for batteries applications due to their wider electrochemical windows, especially along negative directions, than 1,3-dialkylimidazolium cation-based ionic liquids, which may make them suitable electrolytes for highenergy storage devices. TFSI anion is usually chosen because RTILs based in this anion have lower viscosity, higher molar conductivity and also higher electrochemical stability.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of two ionic liquids with emphasis on their chemical stability towards metallic lithium

Camilo

Kawano

Torresi

2007

Electrochimica Acta

165

138

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of two ionic liquids with emphasis on their chemical stability towards metallic lithium

Camilo

Kawano

Torresi

2007

Electrochimica Acta

165

138

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“…For electrochemical experiments, these media also represent an attractive option, owing to their “potential windows” (which are sufficiently large for many applications), chemical inertness with respect to most reactants, the possibility to deoxygenate them or/and to remove water from them rapidly by vacuum pumping with/without heating, and their sufficiently high electric conductivity which allows one to perform electrochemical measurements without an additional supporting electrolyte. , These advantageous properties allowed one to use ILs as media for advanced electrochemical devices, electrochemically promoted organic reactions, − electrodeposition of metals and semiconductors, and electrochemistry of conducting polymers. − See review for other references.…”

Section: Introductionmentioning

confidence: 99%

“…The relation between the potentials measured versus such RE and those with respect to a conventional scale is often based on the measurement of the standard potential for a known solute species with a simple redox mechanism and a relatively weak dependence on solvent properties, first of all for ferrocene (Fc) oxidation in the same medium, as was proposed in ref and recommended for use by IUPAC . In this context a detailed knowledge of this process is of great importance and numerous studies in various ILs have been performed, including those with several 1,3-dialkylimidazolium cations ,,,,− (M = methyl, E = ethyl, B = butyl): [MMIM], [EMIM], [BMIM], [BBIM], [BEIM]; see review for abbreviation rules.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Spectral Properties of Ferrocene (Fc) in Ionic Liquid: 1-Butyl-3-methylimidazolium Triflimide, [BMIM][NTf₂]. Concentration Effects

et al. 2009

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Several earlier studies of the electrochemical oxidation of ferrocene (Fc) in room-temperature ionic liquids revealed an essentially nonlinear dependence of the oxidation current on the Fc concentration in its relatively dilute solutions, with its formally calculated diffusion coefficient strongly increasing with the concentration. Since no plausible mechanism leading to this very unusual finding had been proposed, our study of Fc solutions in 1-butyl-3-methylimidazolium triflimide, [BMIM][NTf(2)], was performed to verify whether the above observation originated from an incorrect determination of the dissolved Fc concentration. Our observations have demonstrated that reliable control of the Fc concentration in solution is complicated by factors such as the low amount of Fc used to prepare small-volume solutions or the great difficulty to dissolve completely a solid powder in a solvent with an extremely high viscosity. An unexpected additional complication is related to a sufficiently high volatility of Fc which manifests itself even at room temperature and especially at elevated temperatures or/and in the course of vacuum treatment of its solutions or its solid powder. Parallel measurements of electrochemical responses and UV-visible spectra for several series of Fc solutions of various concentrations (prepared with the use of different procedures) have shown a perfect parallelism between the peak current and the intensity of the absorption band in the range of 360-550 nm, leading us to the conclusion of a linear relationship between the oxidation current and the molecularly dissolved Fc concentration. The relations of these measured characteristics with the estimated Fc concentration in these solutions have demonstrated a much greater dispersion (attributed to the difficulty of a precise measurement of the latter) but without a significant deviation from the linearity in general. This finding has allowed us to estimate the diffusion coefficient of this species: D = (1.7 +/- 0.2) x 10(-7) cm(2)/s. The extinction coefficients for the maximum of the absorption band (at 440 nm) of Fc have been compared for a series of solvents: [BMIM][NTf(2)], acetonitrile, THF, heptane, CH(2)Cl(2), ethanol, and toluene. A simple method to estimate reliably the concentration of solute Fc in ionic liquids based on spectroscopic measurements has been proposed, owing to the proximity of Fc absorption properties for a great variety of solvents.

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“…It is used 9-fluorenone and nitrobenzene as probe because both compounds have the same magnitude value of diffusion coefficient without further limitations (DMF (10 −9 m 2 •s −1 ) nor ionic liquids (10 −11 m 2 •s −1 ) [145,146]. The number of electrons involved in this first electron transfer was also confirmed by controlled-potential electrolysis.…”

Section: Cyclic Voltammetrymentioning

confidence: 90%

Electrochemical Tuning of CO2 Reactivity in Ionic Liquids Using Different Cathodes: From Oxalate to Carboxylation Products

Mena

Guirado

2020

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There is currently quite a lot of scientific interest in carbon dioxide (CO2) capture and valorization with ionic liquids (ILs). In this manuscript, we analyze the influence of the potential applied, the nature of the cathode and the electrolyte using different organic mediators, such as nitro or cyano aromatic derivatives, to promote the electrochemical activation of CO2. An electrocatalytic process using a homogeneous catalysis is seen when nitroderivatives are used, yielding to oxalate in organic electrolytes and ILs. Turnover frequency (TOF) values and Farafay efficiencies were slightly higher in N,N’-dimethylformamide (DMF) than in ILs probably due to the viscosity of the electrolyte. The use of cyano derivatives allows to tune the electrochemical reactivity in function of the reduction potential value applied from electrocarboxylated products (via a nucleophile-electrophile reaction) to oxalate. These electrochemical reactions were also performed using three different cathodes, organic electrolytes and ionic liquids. The use of copper, as a cathode, and ionic liquids, as electrolytes, would be a cheaper and greener alternative for activating carbon dioxide.

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Electrochemistry in Ionic Liquids

Cited by 5 publications

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Synthesis and characterization of two ionic liquids with emphasis on their chemical stability towards metallic lithium

Synthesis and characterization of two ionic liquids with emphasis on their chemical stability towards metallic lithium

Electrochemical and Spectral Properties of Ferrocene (Fc) in Ionic Liquid: 1-Butyl-3-methylimidazolium Triflimide, [BMIM][NTf₂]. Concentration Effects

Electrochemical Tuning of CO2 Reactivity in Ionic Liquids Using Different Cathodes: From Oxalate to Carboxylation Products

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Electrochemistry in Ionic Liquids

Cited by 5 publications

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Synthesis and characterization of two ionic liquids with emphasis on their chemical stability towards metallic lithium

Synthesis and characterization of two ionic liquids with emphasis on their chemical stability towards metallic lithium

Electrochemical and Spectral Properties of Ferrocene (Fc) in Ionic Liquid: 1-Butyl-3-methylimidazolium Triflimide, [BMIM][NTf2]. Concentration Effects

Electrochemical Tuning of CO2 Reactivity in Ionic Liquids Using Different Cathodes: From Oxalate to Carboxylation Products

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Electrochemical and Spectral Properties of Ferrocene (Fc) in Ionic Liquid: 1-Butyl-3-methylimidazolium Triflimide, [BMIM][NTf₂]. Concentration Effects