Abstract
The 1-n-butyl-3-methylimidazolium trifluoroacetate ionic liquid electrochemical windows have been investigated at vitreous carbon and platinum disc electrodes under static and dynamic conditions. The electrochemical window abruptly decreases by changing vitreous carbon (4.50 V) by platinum electrode (2.50 V). Electrode rotation and potential sweep rate did not affect the current-potential profiles but alter the current values of both anodic and cathodic peaks. The adsorption of imidazolium cation involved in the charge transfer process during the cathodic sweep rate was evidenced, mainly at low electrode rotation.
Highlights
Room temperature molten salts or ionic liquids have been historically considered as liquid electrolytes composed entirely of ions
We have recently showed that the ionic liquids obtained from the combination of 1-n-butyl-3-methylimidazolium cation with tetrafluoroborate and hexafluorophosphate are fluid within a wide range of temperature[6] and possess an enlarged electrochemical window.[7]
We have shown that the 1-n-butyl-3methylimidazolium trifluoroacetate ionic liquid posses an increased electrochemical window, compared with other solvents described so far
Summary
Room temperature molten salts or ionic liquids have been historically considered as liquid electrolytes composed entirely of ions. We report the electrochemical behavior of vitreous glass carbon and platinum electrodes in the 1-nbutyl-3-methylimidazolium trifluoroacetate ionic liquid. This fact may be explained considering that the concentration of the electroactive species involved in the cathodic process on the electrode surface increases when the system was kept static.
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