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Enhancing the selectivity of CO formation for electrochemical reduction of CO2 on tin(IV) oxide-based catalysts
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2020-06-06 , DOI: 10.1016/j.jtice.2020.03.014
Yun Wei , Ren-Hau Guo , Chi-Chang Hu

In this work, the relationship between crystal size of SnO2 and CO selectivity (the CO/formate ratio) is investigated and a great enhancement in CO selectivity is achieved by reduction in its crystal size. The crystal size of SnO2 is less than 5 nm by the synthesis of a core-shell-like microstructure of SnO2 on the rutile-phase TiO2 particles (denoted as R-TiO2@SnO2). The faradaic efficiency and CO selectivity are promoted to be over 42% and 1.18, which are two folds of that of pure SnO2 nanocrystals. According to the X-ray photoelectron spectroscopic results, SnO is more active for the CO2ER to generate CO than Sn or SnO2 and the corresponding electrochemical reduction pathway of CO2 on SnOx is proposed. The increase in the electron density on the oxygen atom of SnO may increase the possibility of *COOH formation, favoring the formation of CO.



中文翻译:

提高在氧化锡(IV)基催化剂上电化学还原CO 2的CO形成选择性

在这项工作中,研究了SnO 2的晶体尺寸与CO选择性(CO /甲酸酯比)之间的关系,并通过减小其晶体尺寸实现了CO选择性的极大提高。SnO的晶体尺寸2是由合成小于5nm的核-壳状的SnO微结构2上的金红石相的TiO 2颗粒(表示为R-的TiO 2 @SnO 2)。法拉第效率和CO选择性提高到42%和1.18以上,是纯SnO 2纳米晶体的两倍。根据X射线光电子能谱结果,SnO对于CO 2 ER生成CO的活性比Sn或SnO高。2和CO的相应电化学还原途径2上的SnO X提出。SnO的氧原子上电子密度的增加可能会增加* COOH形成的可能性,从而有利于CO的形成。

更新日期:2020-07-20
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