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Issue 36, 2010
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Double layer in room temperature ionic liquids: influence of temperature and ionic size on the differential capacitance and electrocapillary curves

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Abstract

Differential capacity–potential curves, C(E), were obtained from electrochemical impedance spectra (12 kHz–2 Hz) for the interfaces between Hg and a series of alkyl imidazolium-based room temperature ionic liquids having the same anion, bis(trifluoromethanesulfonyl) imide: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide [EMIM][Tf2N], 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide [BMIM][Tf2N], 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide [HMIM][Tf2N]. The electrocapillary curves were obtained from drop time measurements and the values of the pzc were calculated. The pzc apparently becomes more negative as the imidazolium alkyl chain length increases. A small effect of the cation is seen on the C(E) curves at negative potentials. The effect of the aromatic nature of the cation is assessed by comparing 1-butyl-1-methylimidazolium bis(trifluoromethanesulfonyl) imide, with 1-butyl-3-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide [BMPyr][Tf2N]. The effects of temperature on the capacitance, drop time electrocapillary curve and on the pzc were also obtained. The capacity was found to increase with increasing temperature in the whole range of accessible potentials.

Graphical abstract: Double layer in room temperature ionic liquids: influence of temperature and ionic size on the differential capacitance and electrocapillary curves

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Publication details

The article was received on 09 Mar 2010, accepted on 24 May 2010 and first published on 29 Jul 2010


Article type: Paper
DOI: 10.1039/C003920A
Citation: Phys. Chem. Chem. Phys., 2010,12, 11125-11132
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    Double layer in room temperature ionic liquids: influence of temperature and ionic size on the differential capacitance and electrocapillary curves

    R. Costa, C. M. Pereira and F. Silva, Phys. Chem. Chem. Phys., 2010, 12, 11125
    DOI: 10.1039/C003920A

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