To date, most work is mainly concen

To date, most work is mainly concentrated on changing the catalyst morphology, surface structure, and composition, in order to improve the activity of the catalyst, with much less investigation on reactor design10-13. It should be noted, electrochemical reduction activity of carbon dioxide is susceptibly influenced by mass transfer due to the low solubility of CO2 in the aqueous electrolyte, especially in the presence of high current densities14, 15. Therefore, it will be important to increase the mass transfer rate of CO2 to obtain high catalytic selectivity at high current densities.