Two-Dimensional Amorphous SnOx from Liquid Metal: Mass Production, Phase Transfer and Electrocatalytic CO2 Reduction towards Formic Acid
Two-Dimensional Amorphous SnOx from Liquid Metal: Mass Production, Phase Transfer and Electrocatalytic CO2 Reduction towards Formic Acid
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来自液态金属的二维非晶 SnOx：大规模生产、相转移和电催化 CO2 还原为甲酸
DOI：
10.1021/acs.nanolett.0c00844
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发表时间：
2020
期刊：
影响因子：
10.8
通讯作者：
Shi Hu
中科院分区：
文献类型：
--
作者：
Tingbiao Yuan;Zheng Hu;Yuxin Zhao;Jinjie Fang;Qinghua Zhang;Zhongbin Zhuang;Lin Gu;Shi Hu
液态金属暴露在氧气中形成一层薄薄的氧化皮，这一层可以通过机械分层或气体注入/溶剂分散来剥离。尽管通过气体注入和水分散的方法成功地在室温下制备了二维氧化物，但在非水溶剂中高温合成的方案仍然是一个挑战。本文报道了从液态锡铋合金和选定的非水溶剂中大量制备含铋装饰的非晶态二维SnOx纳米片。溶剂的官能团对产物的最终形态起着关键作用，富含羟基的溶剂对二维SnOx的控制效果最好。在密度泛函理论计算的基础上，进一步讨论了促进这一相转移过程的不同溶剂-氧化物相互作用。最后，对所得到的二维SnOx进行了电催化二氧化碳还原的评价，结果表明，该催化剂具有高的法拉第效率(>；90%)和超过10小时的稳定性能。
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 is successfully demonstrated, a synthetic protocol in non-aqueous 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 non-aqueous 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 towards 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 hours.