Lee, Woong Hee Ko, Young-Jin Choi, Yongjun Lee, Si Young Choi, Chang Hyuck Hwang, Yun Jeong Min, Byoung Koun Strasser, Peter Oh, Hyung-Suk 2024-01-19T16:32:17Z 2024-01-19T16:32:17Z 2021-09-02 2020-10 2211-2855 https://pubs.kist.re.kr/handle/201004/118051 The direct electroreduction of CO2 to pure CO streams has attracted much attention for both academic research and industrial polymer synthesis development. Here, we explore catalytically very active, coral-structured Ag catalyst for the generation of pure CO from CO2-feeds in lab-bench scale zero-gap CO2 electrolyzer. Coral-shaped Ag electrodes achieved CO partial current densities of up to 312 mA cm(-2), EECO of 38%, and FECO clearly above 90%. In-situ/operando X-ray Absorption Spectroscopy revealed the sustained presence of Ag+ subsurface species, whose local electronic field effects constitute likely molecular origins of the favorable experimental kinetics and selectivity. In addition, we show how electrode flooding in zero-gap CO2 electrolyzer compromises efficient CO2 mass transfer. Our studies highlight the need for a concomitant consideration of factors related to intrinsic catalytic activity of the active phase, its porous structure and its hydrophilicity/phobicity to achieve a sustained high product yield in AEM zero-gap electrolyzer. English ELSEVIER Highly selective and scalable CO2 to CO - Electrolysis using coral-nanostructured Ag catalysts in zero-gap configuration Article 10.1016/j.nanoen.2020.105030 1 NANO ENERGY, v.76 NANO ENERGY 76 N scie scopus 000572164400005 2-s2.0-85087171725 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article CARBON-DIOXIDE ELECTROCHEMICAL REDUCTION EFFICIENT ELECTROREDUCTION ELECTRODES CELL CONVERSION INSIGHTS MONOXIDE CO2 reduction reaction (CO2RR) Silver-coral CO production AEM zero-Gap electrolyzer Hydrophobicity