Potential step study of electrooxidation of methanol in 1-butyl-3-methylimidazolium tetrafluoroborate |
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| Affiliation: | 1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2. Department of Electrical Engineering, University of California, Los Angeles, CA 90095, USA;1. Department of Innovation Engineering of the University of Salento, via per Monteroni, 73100 Lecce, Italy;2. Department of Mathematics and Physics of the University of Salento, via per Monteroni, 73100 Lecce, Italy |
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| Abstract: | A potential step method was used to characterize the electrooxidation of methanol on a chemically modified electrode in an ionic liquid solvent. Two major findings were reported from this study. Firstly, the oxidation was dominant 2.2 s after the potential step. Before that, the double layer charging and adsorption were dominant. Therefore, there should be a waiting time of a few seconds if a methanol sensor is developed with a potential step method. Secondly, the oxidation of methanol on the electrode was diffusion controlled. The concentration of methanol affected the diffusion. The diffusion constant D0 was 8.37 × 10?17 m2/s when the concentration was lower than 0.5 M and was 2.66 × 10?13 m2/s when the concentration was higher than 1.0 M. This suggests that the methanol concentration should be kept higher than a threshold in an ionic liquid based fuel cell. |
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| Keywords: | Ionic liquid Fuel cell Sensor BMIm Imidazolium Two-dimensional correlation |
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