Direct formation of dendritic Ag catalyst on a gas diffusion layer for electrochemical CO2 reduction to CO and H2. (14th June 2018)

• Record Type: Journal Article
• Authors: Ham, Yu Seok; Kim, Myung Jun; Lim, Taeho; Kim, Dong-Kwon; Kim, Soo-Kil; Kim, Jae Jeong
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 24(2018)
• Page Start: 11315
• Page End: 11325
• Publication Date: 2018-06-14
• Subjects: Gas diffusion electrode -- Ag catalyst -- Pulse deposition -- Sonication -- CO production; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.12.067
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Dendritic Ag (a CO2 -to-CO reduction catalyst) has been synthesized on carbon paper (CP) using pulse electrodeposition to fabricate a gas diffusion electrode. A combination of sonication and pulse deposition facilitated mass transfer of Ag ions to the CP, enlarging the catalyst active surface area without significantly changing the Ag crystalline structure. The current density of CO2 reduction was proportional to the surface area of dendritic Ag. Further improvements in performance were achieved by adding polyethylene glycol to the CO2 reduction cell catholyte that removed the CO gas bubbles produced at the electrode surface. The fabrication methods presented herein suggest an effective gas diffusion electrode for application in the membrane-electrode-assembly-type single cell for electrochemical CO2 reduction. Graphical abstract: Highlights: Ag catalysts for CO2 reduction were fabricated on carbon papers via electrodeposition. The enlarged surface area of Ag was achieved by pulse deposition and sonication. The enlarged surface area of Ag led to the high current density for gas production. Bubble management using PEG in the catholyte also contributed to the gas production.