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

作者：Kim, Cheonghee; Jeon, Hyo Sang; Eom, Taedaehyeong; Jee, Michael Shincheon; Kim, Hyungjun; Friend, Cynthia M.; Min, Byoung Koun^*; Hwang, Yun Jeong

来源：Journal of the American Chemical Society, 2015, 137(43): 13844-13850.

DOI：10.1021/jacs.5b06568

• RENEWABLE ENERGY
• GOLD CLUSTERS
• SIZE
• CONVERSION

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.

• 出版日期2015-11-4