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Bi19Br3S27 nanorods for formate production from CO2 electroreduction with high efficiency and selectivity.
Bi19Br3S27 nanorods for formate production from CO2 electroreduction with high efficiency and selectivity.
- Source :
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Chemical Engineering Journal . Oct2023, Vol. 474, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- [Display omitted] • Bi 19 Br 3 S 27 achieves high FE formate of 96% in a wide potential range of ∼ 700 mV. • Bi 19 Br 3 S 27 has been reconstructed to S,Br-comodified Bi during CO 2 RR. • S,Br-comodified Bi enhances the binding affinity towards CO 2 *- and HCOO*-. Electrocatalytic CO 2 reduction by renewable electricity is a promising approach to mitigate greenhouse effect and energy crisis, whereas the product selectivity and efficiency of catalysts remain to be significantly improved. Adjusting the electronic structure of catalysts by modulating the coordination environment of active sites is an effective way to improve their catalytic performance, but it is limited to deliberate doping. Herein, we synthesize Bi 19 Br 3 S 27 nanorod as an electrocatalyst for CO 2 reduction and realize the electronic structure modulation of Bi sites by S and Br comodification via an in-situ reconstruction. The as-obtained catalyst shows high Faradaic efficiency of formate (FE formate) of 98% at −1.1 V versus reversible hydrogen electrode (vs. RHE) and above 96% in a wide potential range of ∼ 700 mV (-1.1 V ∼ -1.8 V vs. RHE), superior to most of the reported catalysts. Meanwhile, a current density of about 150 mA cm−2 has been achieved in a flow cell with FE formate of 90%. It is disclosed that Bi 19 Br 3 S 27 has been reconstructed to S,Br-comodified Bi during CO 2 reduction process, resulting in positively charged Bi sites, which enhance the stability of CO 2 *- and HCOO*- intermediates and improve the catalytic activity towards formate formation. Compared with S-modified Bi and pure Bi, the S,Br-comodified Bi shows enhanced electron transfer rate and reaction kinetics, favoring its high efficiency in CO 2 RR. Ultimately, a maximum solar-to-formate conversion efficiency of ∼ 4.75% has been achieved in an electrolyzer integrating CO 2 RR and OER (O 2 evolution reaction) powered by Si solar cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 474
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 172844477
- Full Text :
- https://doi.org/10.1016/j.cej.2023.145711