Highly selective and scalable CO2 to CO - Electrolysis using coral-nanostructured Ag catalysts in zero-gap configuration
SCIE
SCOPUS
- Title
- Highly selective and scalable CO2 to CO - Electrolysis using coral-nanostructured Ag catalysts in zero-gap configuration
- Authors
- 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
- Date Issued
- 2020-10
- Publisher
- Elsevier BV
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/115458
- DOI
- 10.1016/j.nanoen.2020.105030
- ISSN
- 2211-2855
- Article Type
- Article
- Citation
- Nano Energy, vol. 76, page. 105030, 2020-10
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