Journal
NANO LETTERS
Volume 20, Issue 4, Pages 2916-2922Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00844
Keywords
Liquid metal; 2D material; tin oxide; bismuth; CO2RR
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Funding
- National Natural Science Foundation of China [21601133]
- Natural Science Foundation of Tianjin, China [18JCYBJC20600]
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Liquid metal forms a thin layer of oxide skin via exposure to oxygen and this layer could be exfoliated by mechanical delamination or gas-injection/solvent-dispersion. Although the roomtemperature fabrication of two-dimensional (2D) oxide through gas-injection and water-dispersion has been successfully demonstrated, a synthetic protocol in nonaqueous solvent at elevated temperature still remains as a challenge. Herein we report the mass-production of amorphous 2D SnOx nanoflakes with Bi decoration from liquid Sn-Bi alloy and selected nonaqueous solvents. The functional groups of the solvents play a key role in determining the final morphology of the product and the hydroxyl-rich solvents exhibit the best control toward 2D SnOx. The different solvent-oxide interaction that facilitates this phase-transfer process is further discussed on the basis of DFT calculation. Finally, the as-obtained 2D SnOx is evaluated in electrocatalytic CO2 reduction with high faradaic efficiency (>90%) of formic acid and stable performance over 10 h.
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