Accession Number : ADA297808

Title :   Relating the In-Situ, Ex-Situ, and Non-Situ Environments in Surface Electrochemistry.

Descriptive Note : Technical rept. Jun 94-May 95,

Corporate Author : WASHINGTON UNIV SEATTLE

Personal Author(s) : Stuve, E. M. ; Krasnopoler, A. ; Sauer, D. E.

PDF Url : ADA297808

Report Date : 15 AUG 1995

Pagination or Media Count : 25

Abstract : The relationship between ultrahigh vacuum surface science and electrochemistry is examined by comparison of so-called non-situ and ex-situ experiments performed in the vacuum environment with in-situ electrochemical experiments. Preadsorbed ClO4 on Ag (110) may be hydrated by post-adsorbed water and lifted off the surface as a hydrated complex at 170 K. This result directly illustrates the electrochemical concepts of anion desorption and nonspecific adsorption and can be explained by analogy to electrochemistry. For ex-situ studies three models exist to describe the key step of removing the electrode from the electrolyte (emersion): ideal, superequivalent, and dynamic. Ideal emersion obtains upon satisfying the criteria of (1) a 1:1 relationship of emersed work function with emersion potential and (2) zero charge transfer upon emersion. These criteria can be tested by Kelvin probe measurements of the work function in vacuum and reimmersion charge transient measurements in the electrochemical cell, respectively. jg p.4

Descriptors :   *ELECTROCHEMISTRY, *SURFACES, TRANSIENTS, MEASUREMENT, PROBES, REMOVAL, ADSORPTION, CELLS, EXPERIMENTAL DESIGN, HYDRATES, COPPER, WORK FUNCTIONS, CHLORIDES, PLATINUM, LEAD COMPOUNDS, ELECTROLYTES, DESORPTION, IMMERSION, ANIONS, SILVER, OXIDATION REDUCTION REACTIONS, ULTRAHIGH VACUUM, ANALOGIES, CHLORATES, PERCHLORIC ACID.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE