Fabrication of Large-Area Ag Gas Diffusion Electrode via Electrodeposition for Electrochemical CO2 Reduction

Title
Fabrication of Large-Area Ag Gas Diffusion Electrode via Electrodeposition for Electrochemical CO2 Reduction
Authors
장종현박영상하민관Seonhwa OhHyanjoo ParkHoyoung KimSoo-Kil Kim
Issue Date
2020-04
Publisher
Coatings
Citation
VOL 10, 341
Abstract
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 cm2 ) 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/cm2 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/cm2 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 cm2 Ag GDEs, respectively. The fabricated 136 cm2 Ag GDE was further used in MEA-type CO2 electrolyzers having an active geometric area of 107.44 cm2 , giving potential-dependent CO conversion efficiencies of 41.99%?57.75% at Vcell = 2.2?2.6 V.
URI
http://pubs.kist.re.kr/handle/201004/72088
ISSN
2079-6412
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KIST Publication > Article
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