Volume 94, 1992

Scanning tunnelling microscopic investigation of iodine-covered Pt single-crystal electrodes

Abstract

Using a home-built scanning tunnelling microscope (STM), the structure of iodine adlayers in air and in electrolyte has been investigated. In air, the occurrence of tip-adatom interactions was demonstrated and an antiphase domain boundary was resolved atomically. The adlayer structure on the Pt(100) surface in 10–4mol dm–3 I solution (pH 4) is potential dependent. At 0.75 V vs. RHE the Pt(100)([graphic omitted] × 5[graphic omitted])R45°–I adlattice is found. At 0.5 V, domains of this structure and of a Pt(100)([graphic omitted] × [graphic omitted])R45°–I adlattice exist. Desorption of iodine (at 0.25 V) leads to a hexagonally reconstructed surface. During deposition of small amounts of copper onto the iodine-covered surface, islands with diameters between 10 and 30 Å, which are one to three atomic layers high, are formed first and then coalesce to a hill-like structure.

Article information

Article type
Paper

Faraday Discuss., 1992,94, 317-327

Scanning tunnelling microscopic investigation of iodine-covered Pt single-crystal electrodes

H. Baltruschat, U. Bringemeier and R. Vogel, Faraday Discuss., 1992, 94, 317 DOI: 10.1039/FD9929400317

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