In situSTM investigation of the lithium underpotential deposition on Au(111) in the air- and water-stable ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide

Literature Information

Publication Date 2009-10-20
DOI 10.1039/B916809E
Impact Factor 3.676
Authors

N. Bocchi


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Abstract

In the present paper the underpotential deposition (UPD) of lithium on Au(111) from 0.5 mol L−1LiTFSA in the air- and water stable ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide, [Py1,4]TFSA, has been investigated by cyclic voltammetry (CV) and in situ scanning tunneling microscopy (STM). The pure [Py1,4]TFSA was found to be inert in the potential regime investigated. The results show that the lithium UPD on Au(111) in [Py1,4]TFSA begins at potentials considerably positive to the electrode potential of bulk deposition and follows a layer-by-layer mechanism with the formation of at least two monolayers. A large number of monoatomically deep pits appear when the potential reaches positive values, which is an indication that a Li–Au alloy was formed.

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