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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
POSTECH Authors
HAN, JEONG WOO
Date Issued
Jun-2019
Publisher
Elsevier
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 , 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.
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 , 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.
Keywords
Binary alloys; Carbon dioxide; Catalyst activity; Catalyst selectivity; Copper; Density functional theory; Electrocatalysts; Electrolytic reduction; Hydrocarbons; Nanocatalysts; Nanometals; Nanoparticles; Palladium; Palladium alloys; Precious metals; Synthesis (chemical); Catalyst surfaces; Catalytic performance; CO2 reduction; Colloidal methods; Electrochemical reductions; Faradaic efficiencies; Hydrocarbon production; Selective catalysts; Copper alloys
URI
http://oasis.postech.ac.kr/handle/2014.oak/94655
DOI
10.1016/j.apcatb.2019.01.021
ISSN
1873-3883
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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