Enhanced Electrochemical Reduction of CO2 by Zeolitic Imidazolate Frameworks-8 Supported Silver Nanoparticles
School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, Zhejiang, People's Republic of China
Adv. Mater. Lett., 2020, 11 (8), 20081546
Publication Date (Web): Jul 16, 2020
Copyright © IAAM-VBRI Press
Silver (Ag) is a typical catalyst for CO2 electroreduction. To improve the CO faradaic efficiency, ZIF-8 supported thiol-capped Ag nanoparticles (Ag NPs) of about 3.9 nm were facilely synthesized by reducing Ag+ in ZIF-8 suspension in the presence of thiol-containing mercaptopropionic acid (MPA) molecules. MPA can induce the monodisperse Ag NPs formation, cap on the surface of Ag NPs and immobilize on ZIF-8 through coordinating with the unsaturated Zn2+ cations. The Ag/ZIF-8 can efficiently reduce CO2 to CO with a maximum CO faradaic efficiency of 92.3% at the potential of −0.88 V (vs. RHE), higher than that of ZIF-8 and Ag/C. The performance improvement in CO2 electroreduction over Ag/ZIF-8 is probably attributed to the small-size of Ag NPs and the synergistic effect between Ag NPs and ZIF-8.
CO2 reduction, electrocatalysis, ZIF-8, Ag nanoparticles, Ag/ZIF-8, CO.