Catalytic adsorption integrated electrode modified by porous carbon for efficient electrolysis of bicarbonate
Electrolytic bicarbonate conversion that can avoid the energy-intensive steps(CO2 desorption)has attracted particular interest.However,the rapid escape of CO2 generated in the electrode leads to the insufficient participation of CO2 in the reaction and the low utilization rate of CO2.In this study,active carbon(AC)was used as an adsorption layer to modify the electrode.AC was mixed with CO2 catalytic material Ag to construct an catalytic adsorption integrated electrode(AC+Ag),Which effectively regulated the pore structure of the gas diffusion electrode.And it explored the influence of CO2 adsorption characteristics of different carbon materials on the performance during the electrolytic bicarbonate conversion.When Ag∶AC was 4∶1,Ag NPs loading was 2mg/cm2 and Nafion content was 3.04%,the AC+Ag electrode obtained the highest Faraday efficiency of CO.The FECO reached 59.02%and 53.79%at 100mA/cm2 and 200mA/cm2,respectively.The stability test showed that the electrode can stable convert bicarbonate to CO for 11h.Besides,a high CO2 utilization rate of 68.61%was obtained.This study proved that the AC-modified catalytic adsorption integrated electrode can effectively adsorb CO2 in the electrolytic bicarbonate conversion and improve the electrochemical performance.
electrochemical reduction of CO2in situ reduction of CO2electrolytic bicarbonateelectrode structureintegrated electrode
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