Adsorption and reaction of perchloric acid with clean and water-covered Ag(110)

Journal Article · Thu Jul 26 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100378a060· OSTI ID:6188094

Kizhakevariam, N; Doehl-Oelze, R; Stuve, E M ^[1]

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1. Univ. of Washington, Seattle (USA)

Adsorption of gaseous HClO{sub 4} on Ag(110) was studied under ultrahigh vacuum to investigate the surface chemistry of electrolytes. Surface reactions and adsorbate structure were studied over the temperature range of 100-900 K and coverage range of zero to several multilayers with thermal desorption spectroscopy (TDS), low-energy electron diffraction (LEED), and electron-stimulated desorption ion angular distribution (ESDIAD). HClO{sub 4} adsorbed molecularly at 100 K with a sticking coefficient of {approx} 10{sup {minus}1} or less. The sticking coefficient increased to unity with increasing coverage due to hydrogen-bonding interactions with concurrently adsorbed H{sub 2}O. Once adsorbed, HClO{sub 4} deprotonated below 150 K to produce adsorbed perchlorate (ClO{sub 4}). Saturation coverage of ClO{sub 4} was 0.5 monolayer for which a c(2{times}2) LEED pattern was observed. Adsorbed perchlorate decomposed above 450 K to give adsorbed chlorine and gaseous oxygen in a Cl:O atomic ratio of 1:4.

• OSTI ID: 6188094
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
ADSORPTION
DATA
DATA ANALYSIS
ELECTROLYTES
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
PERCHLORIC ACID
SILVER
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS
ULTRAHIGH VACUUM