Abstract
Ionic liquids have interesting properties because they have several advantages compared to conventional organic solvents, such as high thermal stability, high viscosity, good solvent properties, non-flammable, and non-volatile. In electrochemistry, ionic liquids can be used as solvents without the addition of electrolytes. However, ionic liquids still have resistivity properties (uncompensated resistance), thus ohmic drop measurements are needed for a potential correction. Imidazole-based ionic liquids, which are known for their high conductivity and commonly used as a solvent, have been measured of their resistivity as a function of temperature, and type of their cations/anions. Electrochemical Impedance Spectroscopy (EIS) method was chosen to measure the resistivity of ionic liquids and Bode plot was generated for the analysis of the results. The measured resistivities of ionic liquids are in the range of 420 to 1500 ohm. It is concluded that the resistivity of the imidazole-based ionic liquid is influenced by the size of their constituent ions, the viscosity, and the resistance is decreased with increasing temperature.
Highlights
Ionic liquids have interesting properties because they have several advantages compared to conventional organic solvents
ionic liquids can be used as solvents without the addition
thus ohmic drop measurements are needed for a potential correction
Summary
Lima jenis cairan ion berbasis imidazol diperoleh dari Sigma-Aldrich dan digunakan dalam percobaan tanpa pemurnian lebih lanjut. Gas nitrogen (N2) UHP digunakan untuk proses pembilasan sel elektrokimia dan purging selama pengukuran. Pengukuran nilai Ru cairan ion dilakukan menggunakan Potensiostat merek Gamry tipe Ref3000 yang dilengkapi dengan sel sistem tiga elektroda. Pada penelitian ini dilakukan pengukuran nilai Ru dari lima jenis cairan ion pada berbagai temperatur, sedangkan pengukuran nilai viskositas masing-masing cairan ion tidak dilakukan. Nilai viskosistas yang digunakan pada penelitian ini merupakan hasil penelitian sebelumnya dimana cairan ion yang digunakan berasal dari batch yang sama. Untuk pengukuran nilai Ru, masing-masing dari lima cairan ion berbasis imidazol dipipet sebanyak 400 μL ke dalam sel elektrokimia berbahan Teflon. Sel elektrokimia selalu dibilas di bawah aliran nitrogen dan dilakukan purging selama pengukuran. Spesi Zw dianggap diabaikan dan tidak termasuk dalam kajian penelitian
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