Abstract
In this study, an electrochemical route was proposed for metal alkoxides preparation by taking advantage of alcohol dissociation (ROH → RO− + H+) in a bipolar membrane. A current density of 25 mA cm−2 was optimized for lithium methoxide and magnesium methoxide production with energy consumption of 28.84 kWh∙kg−1 and 27.98 kWh∙kg−1, respectively. Electrochemical impedance spectroscopy (EIS) characterization indicated that the threshold voltage for alcohol dissociation for the Neosepta BP-1E bipolar membrane is 6.02 V, which is much higher than that for water splitting of 0.72 V. For a bipolar membrane, the resistance of the alcohol dissociation (RAD) and the resistance of the diffusion boundary layer (RDBL) are the major contributors to the impedance for methanol splitting, while only the latter is the predominant contributor to the impedance for water splitting. Overall, alcohol splitting in bipolar membrane provides a versatile platform for green preparation of metal alkoxides.
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