期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 43, 页码 13844-13850出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b06568
关键词
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资金
- Korea Institute of Science and Technology (KIST)
- University-Institute cooperation program of the National Research Foundation of Korea - Korean Government (MSIP)
- National Research council of Science Technology
- Rowland Institute at Harvard University
- Ministry of Science, ICT & Future Planning, Republic of Korea [2E25220] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [10Z20130011056, 특화전문대학원-02] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Selective electrochemical reduction of CO2, is one of the most sought-after processes because of the potential to convert a harmful greenhouse gas to a useful chemical. We have discovered that immobilized Ag nanoparticles supported on carbon exhibit enhanced Faradaic efficiency and a lower overpotential for selective reduction of CO2, to CO. These electrocatalysts were synthesized directly on the carbon support by a facile one-pot method using a cysteamine anchoring agent resulting in controlled monodispersed particle sizes. These synthesized Ag/C electrodes showed improved activities, specifically decrease of the overpotential by 300 mV at 1 mA/cm(2), and 4-fold enhanced CO Faradaic efficiency at -0.75 V vs RHE with the optimal particle size of 5 nm compared to polycrystalline Ag foil. DFT calculations enlightened that the specific interaction between Ag nanoparticle and the anchoring agents modified the catalyst surface to have a selectively higher affinity to the intermediate COOH over CO, which effectively lowers the overpotential.
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