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Journal of Electrochemistry ›› 2016, Vol. 22 ›› Issue (6): 596-601.doi: 10.13208/j.electrochem.160565

• Special Issue on Interfacial Electrochemistry(Guest Editor: Professor Dr. Bingwei Mao) • Previous Articles     Next Articles

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

PENG Jin, LI Mian-gang, XIE Li-qiang, YAN Jia-wei*, MAO Bing-wei*   

  1. College of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005
  • Received:2016-06-29 Revised:2016-09-06 Online:2016-12-28 Published:2016-09-09
  • Contact: YAN Jia-wei, MAO Bing-wei E-mail:jwyan@xmu. edu. cn; 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.

Key words: Electrochemical interface, Ionic liquid, Pt(100), Ordered adsorption

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