期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 246, 期 -, 页码 82-88出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2019.01.021
关键词
Electrochemical CO2 reduction; Electrocatalyst; Nanoparticle; Copper; Palladium
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea [20174030201600, 20182010600430]
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20174030201600, 20182010600430]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018M3D3A1A01018005, 2018M1A2A2061987]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20174030201600, 20182010600430] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018M1A2A2061987] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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