Abstract
Using ionic liquids (ILs) as electrolytes in developing electrochemical sensors for SO2 detection is of much interest. We compared the electrochemical behaviors of SO2 in choline chloride–ethylene glycol-based deep eutectic solvent (ChCl–EG-based DES), 1-(3-hydroxypropyl)-3-methylimidazolium tetrafluoroboride ([C3OHmim]BF4), and [C3OHmim][Formula: see text]monoethanolamine (MEA) (6.2:1 in molar ratio). Addition of MEA into [C3OHmim]BF4 can significantly increase the SO2 absorption capacity and enhance the electrochemical response of SO2. However, as we use ChCl–EG-based DES, the reduction current is 10 times larger than in [C3OHmim]BF4 and 4 times larger than in [C3OHmim][Formula: see text]MEA (6.2:1 in molar ratio). And SO2 gas shows high diffusion coefficient value as in the ChCl–EG-based DES. A good linear relationship between the reduction current and the SO2 content was obtained in the tested SO2 gas content range from 200[Formula: see text]ppm to 1500[Formula: see text]ppm. Our findings provide new route for DESs as electrolytes for SO2 sensor designing with high sensitivity.
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