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Two dimensional metal–oxianion surface complexes formation during the upd process on a Au(1 1 1) electrode studied by in situ surface X-ray diffraction and infrared reflection absorption spectroscopy

2003; Elsevier BV; Volume: 554-555; Linguagem: Inglês

10.1016/s0022-0728(03)00156-6

1873-2569

Masashi Nakamura, Kimihiro Matsunaga, Kuninori Kitahara, M. Ito, Osami Sakata,

Electrochemical sensors and biosensors

Throughout the whole potential ranges where underpotential deposition (upd) proceeds, the stretching absorption bands of both sulfate and phosphate anions (vSO and vPO) do not change at all with regard to band-center position. Sulfate and phosphate anions are combined with copper or zinc ions to form surface metal complexes on a Au(1 1 1) electrode surface, respectively: transition metal–oxianion (sulfate and phosphate) pseudo-complexes are formed in the course of upd processes. The surface structure of the Au(1 1 1) electrode in the topmost layer is the same as the bulk structure (1×1), and lifting of surface reconstruction takes place in the case of Cu-upd where Cu(I)2SO4 and Cu(I)3SO4 pseudo-complexes extend on the surface, while surface reconstruction of a Au(1 1 1) electrode continues to occur in the case of Zn-upd where the Zn(I)2PO4 or Zn(I)3PO4 pseudo-complex locates.