Boosting Electrochemical Reduction of CO2 at a Low Overpotential by Amorphous Ag‐Bi‐S‐O Decorated Bi0 Nanocrystals. (29th August 2019)

• Record Type: Journal Article
• Authors: Zhou, Jun‐Hao; Yuan, Kun; Zhou, Liang; Guo, Yu; Luo, Ming‐Yu; Guo, Xiao‐Yan; Meng, Qing‐Yuan; Zhang, Ya‐Wen
• Is Part Of: Angewandte Chemie. Volume 131:Number 40(2019)
• Page Start: 14335
• Page End: 14339
• Publication Date: 2019-08-29
• Subjects: Ameisensäure -- Amorphes Ag-Bi-S-O -- Bimetallkomposite -- CO2-Elektroreduktion -- Überspannung; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201908735
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Bimetal‐S‐O composites have been rarely researched in electrochemical reduction of CO2 . Now, an amorphous Ag‐Bi‐S‐O decorated Bi 0 catalyst derived from Ag0.95 BiS0.75 O3.1 nanorods by electrochemical pre‐treatment was used for catalyzing eCO2 RR, which exhibited a formate FE of 94.3 % with a formate partial current density of 12.52 mA cm −2 at an overpotential of only 450 mV. This superior performance was attributed to the attached amorphous Ag‐Bi‐S‐O substance. S could be retained in the amorphous region after electrochemical pre‐treatment only in samples derived from metal‐S‐O composites, and it would greatly enhance the formate selectivity by accelerating the dissociation of H2 O. The existence of Ag would increase the current density, resulting in a higher local pH, which made the role of S in activating H2 O more significantly and suppressed H2 evolution more effectively, thus endowing the catalyst with a higher formate FE at low overpotentials. Abstract : Eine Formiateffizienz von 94.3 % bei einer niedrigen Überspannung von 450 mV wurde mithilfe eines von amorphem Ab‐Bi‐S‐O dekorierten Bi 0 ‐Nanokatalysators erzielt; dieser wurde aus dem Bimetall‐S‐O‐Komposit Ag0.95 BiS0.75 O3.1 erhalten. Die Leistung resultiert aus der Beschleunigung der H2 O‐Dissoziation durch S, und der höhere lokale pH‐Wert ergibt sich aus der Gegenwart von Ag.