The Electrochemical Interface of Au(111) and Au(100) in HMIm-FAP Ionic Liquid
The double layer properties of Au(111) and Au(100) in 1-hexyl-3-methylimidazolium (HMIm+) tris(pentafluoroethyl)trifluorophosphate (FAP−) ionic liquid has been characterized by cyclic voltammetry, immersion experiments and in situ STM. Immersion experiments reveal an opposite trend of potential of zero total charge (pztc) on reconstructed and unreconstructed surfaces against the case of aqueous electrolytes, which may relate to the specific adsorption of ions on Au surface. Further in situ STM performed in the double layer region, show that both the Au(100) and Au(111) surfaces undergo the lifting of reconstruction and surface etching at positive and negative potential region of the pztc values, respectively. However, further surface etching on Au(100) was prevented by the formation of the ordered layer of HMIm+ cations.
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Document Type: Research Article
Affiliations: Department for Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
Publication date: 01 August 2016
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