Two-Dimensional Amorphous SnOx from Liquid Metal: Mass Production, Phase Transfer, and Electrocatalytic CO2 Reduction toward Formic Acid

Nano Letters
Tingbiao YuanShi Hu

Abstract

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 room-temperature 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 SnO x 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 SnO x . 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 SnO x is evaluated in electrocatalytic CO2 reduction with high faradaic efficiency (>90%) of formic acid and stable performance over 10 h.

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Citations

Jan 16, 2021·Advanced Materials·Shasha ZhaoLei Fu
Dec 18, 2020·Chemical Communications : Chem Comm·Weixin ZhaoGuolei Xiang
Feb 25, 2021·Chemical Society Reviews·Genxiang WangLiming Dai
May 6, 2020·Nano Letters·Francois-Marie AlliouxKourosh Kalantar-Zadeh
Nov 2, 2021·ACS Applied Materials & Interfaces·Yifang WangKourosh Kalantar-Zadeh

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