Low-Crystallinity-Induced Lattice-Distorted Bismuth Nanosheets for Enhanced Electrocatalytic CO<sub>2</sub> Reduction to Formate.
basic_science · Level V
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- Record sourced from PubMed, PMID 40506859.
- Also identified by DOI 10.1021/acs.nanolett.5c02163.
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Abstract
The electrochemical CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) to formate offers a sustainable route for carbon neutrality, yet achieving high activity and selectivity remains challenging. Herein, we report a crystallinity-mediated reconstruction strategy to engineer lattice compressive Bi nanosheets for efficient CO<sub>2</sub> electroreduction. Ex situ electrochemical reduction of BOC-L with low crystallinity rapidly forms lattice-distorted Bi nanosheets (Bi NS-L), while BOC-H with high crystallinity undergoes slower reconstruction, yielding ordered Bi nanosheets (Bi NS-H). The compressive strain enhances the CO<sub>2</sub> adsorption and improves the intrinsic activity of Bi nanosheets. Consequently, Bi NS-L achieves a formate Faradaic efficiency of 94.8% at -1.08 V vs RHE, surpassing Bi NS-H (89.1%), with a partial current density of 247.49 mA cm<sup>-2</sup> in a flow cell. Moreover, coupling the CO<sub>2</sub>RR with anodic glycerol oxidation (GOR) reduces the cell voltage to 2.3 V (2.5 V for the CO<sub>2</sub>RR/OER) at 200 mA cm<sup>-2</sup>, enabling 3965.6 μmol h<sup>-1</sup> cm<sup>-2</sup> formate production.