An STM study on the Structure of Pt(100)/Ionic Liquid OMIPF₆ Interface

Authors

Jin PENG, College of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005;
Mian-gang LI, College of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005;
Li-qiang XIE, College of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005;
Jia-wei YAN, College of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005;Follow
Bing-wei MAO, College of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005;Follow

Corresponding Author

Jia-wei YAN(jwyan@xmu.edu.cn);
Bing-wei MAO(bwmao@xmu.edu.cn)

Abstract

Potential-dependent structures of Pt(100)/ionic liquid 1-methyl-3-octylimidazolium hexafluorophosphate (OMIPF₆) interface have been studied by electrochemical scanning tunneling microscopy (ECSTM). The cation OMI⁺ forms ordered structure on Pt(100) surface, which exists in a potential region of about 1.2 V. When the potential is more negative than -0.6 V, it can be seen that the ordered structure transforms to disordered structure. When the potential shifts positively to +0.6 V, the desorption of cations OMI⁺ occurs, which indicates that strong electrostatic repulsion is needed to overcome chemical interaction between OMIPF6 and Pt(100) surface, leading to the desorption. The above results demonstrate that owing to the longer alkyl chain OMI+ can interact strongly with Pt(100), which plays an important role in the structure of Pt(100)/ OMIPF₆ interface.

Graphical Abstract

Keywords

Electrochemical interface, Ionic liquid, Pt(100), Ordered adsorption

DOI Link

https://doi.org/10.13208/j.electrochem.160565

Publication Date

2016-12-28

Online Available Date

2016-09-09

Revised Date

2016-09-06

Received Date

2016-06-29

Recommended Citation

Jin PENG, Mian-gang LI, Li-qiang XIE, Jia-wei YAN, Bing-wei MAO. An STM study on the Structure of Pt(100)/Ionic Liquid OMIPF₆ Interface[J]. Journal of Electrochemistry, 2016 , 22(6): 596-601.
DOI: 10.13208/j.electrochem.160565
Available at: https://jelectrochem.xmu.edu.cn/journal/vol22/iss6/8