%0 Online Multimedia %A Li, Yuguang C. %A Lee, Geonhui %A Yuan, Tiange %A Wang, Ying %A Nam, Dae-Hyun %A Wang, Ziyun %A Pelayo García de Arquer, F. %A Lum, Yanwei %A Dinh, Cao-Thang %A Voznyy, Oleksandr %A Sargent, Edward H. %D 2019 %T CO2 Electroreduction from Carbonate Electrolyte %U https://acs.figshare.com/articles/media/CO_sub_2_sub_Electroreduction_from_Carbonate_Electrolyte/8204594 %R 10.1021/acsenergylett.9b00975.s002 %2 https://acs.figshare.com/ndownloader/files/15291044 %K syngas product stream %K CO 2 release %K CO 2 electrolysis %K CO 2 %K CO 2 Electroreduction %K upgrades carbonate electrolyte %K CO 2 conversion technologies %X The process of CO2 valorizationfrom capture of CO2 to its electrochemical upgraderequires significant inputs in each of the capture, upgrade, and separation steps. Here we report an electrolyzer that upgrades carbonate electrolyte from CO2 capture solution to syngas, achieving 100% carbon utilization across the system. A bipolar membrane is used to produce proton in situ to facilitate CO2 release at the membrane:catalyst interface from the carbonate solution. Using a Ag catalyst, we generate syngas at a 3:1 H2:CO ratio, and the product is not diluted by CO2 at the gas outlet; we generate this pure syngas product stream at a current density of 150 mA/cm2 and an energy efficiency of 35%. The carbonate-to-syngas system is stable under a continuous 145 h of catalytic operation. The work demonstrates the benefits of coupling CO2 electrolysis with a CO2 capture electrolyte on the path to practicable CO2 conversion technologies. %I ACS Publications