Electrochemical reduction of CO₂on defect-rich Bi derived from Bi₂S₃with enhanced formate selectivity

Abstract

An urchin-like sulphide-derived bismuth electrocatalyst was synthesised for CO2reduction and a maximum of 84.0% faradaic efficiency for formate formation was achieved. The origin of the activity of the sulphide-derived bismuth catalyst was explored and its defect-rich structure was responsible for the high formate selectivity.

Morphology‐Controlled Bi2O3 Nanoparticles as Catalysts for Selective Electrochemical Reduction of CO2 to Formate

“…The obtained results were shown in Figure b. It could be seen that the formate FE (91 %) and current density (22 mA cm −2 ) could keep stable without any significant decreasing during the electrolysis for 23 h. The result is comparable with those reported in the previous literature, demonstrating that Bi 2 O 3 ‐A electrode catalyst has a potential application for CO 2 electroreduction.…”

“…Some investigations have indicated that Bi catalysts could effectively catalyze CO 2 reduction to form CO with high Faradaic efficiencies (FEs) in an aprotic solvent (e. g., MeCN) containing ion liquids ,. More interestingly, some researchers have recently reported that Bi with different microstructures as electrodes could catalyze the electroreduction of CO 2 to formate with high selectivity and high FE in aqueous solutions . These investigations greatly promote the development of Bi‐based electrocatalysts.…”

“…However, it should be noted that some key problems have not still be solved, such as poor catalytic stability and low electrolytic current density. In the previous investigations, the stability of Bi electrode catalysts was only examined for 7∼12 h and current density was relatively low (within the range 3∼15 mA cm −2 ), which could not meet the requirement of practical applications. So Bi‐based electrocatalysts need to be improved greatly.…”

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi2S3 nanorods

“…[1][2][3][4][5][6] It has been widely accepted that the introduction of vacancies induces the formation of new energy levels,w hich can narrowt he band gap of the catalysts and thus enhance their light-harvesting ability.F or example, the introduction of oxygen vacanciess ignificantly improves the visible-light response in TiO 2 , [7,8] BiPO 4 , [9] Bi 5 O 7 Br, [10] BiOBr, [11] BiOCl, [12] BiO 2Àx , [13] and ZnO photocatalysts. [1][2][3][4][5][6] It has been widely accepted that the introduction of vacancies induces the formation of new energy levels,w hich can narrowt he band gap of the catalysts and thus enhance their light-harvesting ability.F or example, the introduction of oxygen vacanciess ignificantly improves the visible-light response in TiO 2 , [7,8] BiPO 4 , [9] Bi 5 O 7 Br, [10] BiOBr, [11] BiOCl, [12] BiO 2Àx , [13] and ZnO photocatalysts.…”

Electrochemical Transformation of Facet‐Controlled BiOI into Mesoporous Bismuth Nanosheets for Selective Electrocatalytic Reduction of CO2 to Formic Acid

“…Theoretically, Bi nanosheets with a few layers can be obtained. Among various synthetic approaches, an electrochemical transformation strategy has been exploited to successfully prepare 2 D materials . Fortunately, most of the extensively studied Bi‐based compounds, such as BiOX (X=Cl, Br and I), Bi 2 O 2 CO 3 , BiVO 4 , and BiWO 6 , also have a unique layered structure resulting from weak van der Waals bonding interactions along specific directions.…”