A Cu-Pd alloy catalyst with partial phase separation for the electrochemical CO2 reduction reaction
- Authors
- Han, Gyeong Ho; Seo, Jung Yong; Kang, Minji; Seo, Myung-gi; Choi, Youngheon; Kim, Soo Young; Ahn, Sang Hyun
- Issue Date
- Jun-2024
- Publisher
- Elsevier B.V.
- Keywords
- Cu-Pd catalyst; Electrochemical carbon dioxide reduction; Electrodeposition; Membrane electrode assembly-based electrolyzer; Partial phase separation
- Citation
- Journal of Energy Chemistry, v.93, pp 8 - 15
- Pages
- 8
- Journal Title
- Journal of Energy Chemistry
- Volume
- 93
- Start Page
- 8
- End Page
- 15
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/73005
- DOI
- 10.1016/j.jechem.2024.01.071
- ISSN
- 2095-4956
- Abstract
- Cu catalysts can convert CO2 through an electrochemical reduction reaction into a variety of useful carbon-based products. However, this capability provides an obstacle to increasing the selectivity for a single product. Herein, we report a simple fabrication method for a Cu-Pd alloy catalyst for use in a membrane electrode assembly (MEA)-based CO2 electrolyzer for the electrochemical CO2 reduction reaction (ECRR) with high selectivity for CO production. When the composition of the Cu-Pd alloy catalyst was fabricated at 6:4, the selectivity for CO increased and the production of multi-carbon compounds and hydrogen is suppressed. Introducing a Cu-Pd alloy catalyst with 6:4 ratio as the cathode of the MEA-based CO2 electrolyzer showed a CO faradaic efficiency of 92.8% at 2.4 Vcell. We assumed that these results contributed from the crystal planes on the surface of the Cu-Pd alloy. The phases of the Cu-Pd alloy catalyst were partially separated through annealing to fabricate a catalyst with high selectivity for CO at low voltage and C2H4 at high voltage. The results of CO-stripping testing confirmed that when Cu partially separates from the lattice of the Cu-Pd alloy, the desorption of *CO is suppressed, suggesting that C–C coupling reaction is favored. © 2024 Science Press
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