Abstract: The electrosynthesis of dimethyl carbonate (DMC) from CO2 and MeOH in the ［bm im］BF4-MeCN solvent with different V(［bmim］BF4)/V(MeCN) was realized in an undivided cell under mild conditions. The ionic liquid ［bmim］BF4 containe d in the mixed solvent possessed catalytic effect on the CO2 electrolysis. The cathodic peak for CO2 reduction shifted positively in the mixed solvent. Unde r the optimal conditions, the highest DMC yield reached 79.6%. A possible reacti on mechanism for electrosynthesis of DMC was proposed.

Key words: ionic liquid, 1-butyl-3-methyl imidazolium tetrafluoroborate, acetonitrile, carbon dioxide, methanol, electrocatalysis, dimethyl carbonate