title: In situ STM investigation of the lithium underpotential deposition on Au(111) in the air- and water-stable ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide.
abstract: In the present paper the underpotential deposition (UPD) of lithium on Au(111) from 0.5 mol L(-1) LiTFSA in the air- and water stable ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide, [Py(1,4)]TFSA, has been investigated by cyclic voltammetry (CV) and in situ scanning tunneling microscopy (STM). The pure [Py(1,4)]TFSA was found to be inert in the potential regime investigated. The results show that the lithium UPD on Au(111) in [Py(1,4)]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.
authors.affiliation: Institut für Mechanische Verfahrenstechnik, Clausthal University of Technology, Arnold-Sommerfeld-Strasse 6, D-38678 Clausthal-Zellerfeld, Germany.
authors.forename: L H S
authors.initials: LH
authors.lastname: Gasparotto
authors.forename: N
authors.initials: N
authors.lastname: Borisenko
authors.forename: N
authors.initials: N
authors.lastname: Bocchi
authors.forename: S Zein
authors.initials: SZ
authors.lastname: El Abedin
authors.forename: F
authors.initials: F
authors.lastname: Endres