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Characterization of Hg−Pt optically transparent electrodes

1979; Elsevier BV; Volume: 103; Issue: 2 Linguagem: Inglês

10.1016/s0022-0728(79)80436-2

2590-2954

John F. Goelz, William R. Heineman,

Electrochemical Analysis and Applications

A mercury-coated platinum film optically transparent electrode, Hg−Pt OTE, has been evaluated with respect to the nature of its surface. An optimum procedure for preparing Hg−Pt OTEs by electrochemically depositing mercury on a vapor-deposited Pt OTE was developed. The resulting electrodes were characterized by voltammetric stripping of the deposited mercury films and microscopic observation. A relatively stable electrode in which the surface consists of platinum-mercury compounds can be prepared by depositing a ca. 5-nm film of mercury. Thicker mercury films are characterized by mercury droplets which amalgamate with the substrate platinum film, eventually forming a platinum-mercury compound surface.