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Achieving Selective and Efficient Electrocatalytic Activity for CO2 Reduction Using Immobilized Silver Nanoparticles

Author:
Kim, Cheonghee, Jeon, Hyo Sang, Eom, Taedaehyeong, Jee, Michael Shincheon, Kim, Hyungjun, Friend, Cynthia M., Min, Byoung Koun, Hwang, Yun Jeong
Source:
Journal of the American Chemical Society 2015 v.137 no.43 pp. 13844-13850
ISSN:
1520-5126
Subject:
carbon, carbon dioxide, catalysts, cysteamine, electrochemistry, electrodes, foil, greenhouse gases, nanosilver, particle size, silver
Abstract:
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/cm², 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.
Agid:
5416524