Corresponding Author

Yan-xia JIANG(yxjiang@xmu.edu.cn)


The nano-cubic Pt modified by tin (Sn) was synthesized and used to investigate the role of this adatom played in the ethanol oxidation. The onset potential of ethanol oxidation was significantly shifted negatively which can be forward about 300 mV when the coverage of Sn (θSn)was 0.9. The electrtochemical in situ FTIR result demonstrated that the amount of CO2 increased first, and then decreased with θSn increased, and reached the maximun when θSn was 0.38. Furthermore, the formation of acetic acid could be observed at very low potential (-0.05 V) after modifying Sn adatom, and the amount of acetic acid increased with θSn increased. That is, Sn deposited on Pt surfaces has a double effect on the ethanol oxidation. First, it facilitates the oxidation of CO coming from the cleavage of the C—C bond in ethanol by a bifunctiontal mechanism. Second, the Pt–Sn ensemble catalyzes the oxidation of ethanol to acetic acid. This means that the main product in the oxidation of ethanol for the Pt–Sn system should be acetic acid unless the Pt surface structure has some special sites able to break the C—C bond.

Graphical Abstract


tin modified, nano-cubic Pt, ethanol, electrocatalysis, in situ FTIR

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