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Cu-Pd alloy nanoparticles as highly selective catalysts for efficient electrochemical reduction of CO2 to CO

Title
Cu-Pd alloy nanoparticles as highly selective catalysts for efficient electrochemical reduction of CO2 to CO
Authors
MUN, YEONGDONGLEE, SEUNGHYUNCHO, ARAKIM, SEONGBEENHAN, JEONG WOOLEE, JINWOO
Date Issued
Jun-2019
Publisher
Elsevier BV
Abstract
Although a copper catalyst has very interesting properties in CO2 electroreduction reaction (CO2RR), the high overpotential of this reaction and low selectivity of the catalyst for a single product are major hindrances to catalyst commercialization. In this work, monodisperse Cu-Pd nanoparticles (NPs) with various compositions are synthesized using the colloidal method. These NPs show a totally different catalytic performance than bulk Cu catalysts. Alloying Cu with Pd suppresses hydrocarbon production on the alloy NP catalyst surface. NPs with a 1:1 Cu -Pd ratio show the best catalytic activity for the conversion of CO2 to CO. At -0.9 V (vs. RHE), 87% CO Faradaic efficiency is achieved, as well as a high noble metal mass activity of 47 mA mg(Pd)(-1), for CO production. Density functional theory calculations suggest that the energy barrier to the CO* protonation step is increased when Pd is alloyed with Cu; this increase suppresses the reduction of CO2 to hydrocarbons. This result is a significant advance toward selective electrochemical reduction of CO2.
URI
http://oasis.postech.ac.kr/handle/2014.oak/94655
ISSN
0926-3373
Article Type
Article
Citation
Applied Catalysis B: Environmental, vol. 246, page. 82 - 88, 2019-06
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 HAN, JEONG WOO
Dept. of Chemical Enginrg
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