Oh, Seonhwa Park, Hyanjoo Kim, Hoyoung Park, Young Sang Ha, Min Gwan Jang, Jong Hyun Kim, Soo-Kil 2024-01-19T18:00:58Z 2024-01-19T18:00:58Z 2021-09-05 2020-04 2079-6412 https://pubs.kist.re.kr/handle/201004/118814 For the improvement for the commercialization of electrochemical carbon dioxide (CO2) conversion technology, it is important to develop a large area Ag gas diffusion electrode (GDE), that exhibits a high electrochemical CO2 conversion efficiency and high cell performance in a membrane electrode assembly (MEA)-type CO2 electrolyzer. In this study, the electrodeposition of Ag on a carbon-paper gas diffusion layer was performed to fabricate a large area (25.5 and 136 cm(2)) Ag GDE for application to an MEA-type CO2 electrolyzer. To achieve uniformity throughout this large area, an optimization of the electrodeposition variables, such as the electrodes system, electrodes arrangement, deposition current and deposition time was performed with respect to the total electrolysis current, CO production current, Faradaic efficiency (FE), and deposition morphology. The optimal conditions, that is, galvanostatic deposition at 0.83 mA/cm(2) for 50 min in a horizontal, two-electrode system with a working-counter electrode distance of 4 cm, did ensure a uniform performance throughout the electrode. The position-averaged CO current densities of 2.72 and 2.76 mA/cm(2) and FEs of 83.78% (with a variation of 3.25%) and 82.78% (with a variation of 8.68%) were obtained for 25.5 and 136 cm(2) Ag GDEs, respectively. The fabricated 136 cm(2) Ag GDE was further used in MEA-type CO2 electrolyzers having an active geometric area of 107.44 cm(2), giving potential-dependent CO conversion efficiencies of 41.99%-57.75% at V-cell = 2.2-2.6 V. English MDPI CARBON-DIOXIDE ELECTROCATALYTIC REDUCTION CATALYSTS METHANE ELECTROREDUCTION NANOPARTICLES SELECTIVITY CONVERSION DESIGN ETHANE Fabrication of Large Area Ag Gas Diffusion Electrode via Electrodeposition for Electrochemical CO2 Reduction Article 10.3390/coatings10040341 1 COATINGS, v.10, no.4 COATINGS 10 4 scie scopus 000534630600038 2-s2.0-85083854835 Materials Science, Multidisciplinary Materials Science, Coatings & Films Physics, Applied Materials Science Physics Article CARBON-DIOXIDE ELECTROCATALYTIC REDUCTION CATALYSTS METHANE ELECTROREDUCTION NANOPARTICLES SELECTIVITY CONVERSION DESIGN ETHANE carbon dioxide Ag catalyst gas diffusion electrode electrodeposition