Hydrogen adsorption on rhodium
Measurements of thermal desorption and electron work function were used to investigate the mechanism of hydrogen adsorption from the gas phase on rhodium single-crystal faces and on a polycrystalline rhodium sample at room temperatures over the pressure range from 1.3-10/sup -3/ to 1.3 x 10/sup -5/ Pa. It was found that dipoles oriented with their negative ends toward the gas phase (dipoles of type I) form more rapidly than dipoles having the opposite orientation (dipoles of type II). For formation of the latter, a mechanism is proposed according to which the rate-determining step of the overall process is the transition of reversibly adsorbed hydrogen to dipoles of type II (the spillover), which occurs at surface defects. It was shown that the kinetics of this process with respect to the individual defect obeys an equation which is zeroth order in theta/sub H/ and pressure.
- Research Organization:
- A. N. Frumkin Institute of Electrochemistry, Moscow (USSR)
- OSTI ID:
- 5338711
- Journal Information:
- Sov. Electrochem. (Engl. Transl.); (United States), Journal Name: Sov. Electrochem. (Engl. Transl.); (United States) Vol. 23:3; ISSN SOECA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
080201* -- Hydrogen-- Chemisorption Storage
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ADSORPTION
CHEMICAL REACTIONS
CHEMISORPTION
CHEMISTRY
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DESORPTION
DIPOLES
ELECTROCHEMISTRY
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FUNCTIONS
HYDRIDATION
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN STORAGE
LEPTONS
METALS
MULTIPOLES
NONMETALS
ORIENTATION
PLATINUM METALS
POLYCRYSTALS
PRESSURE DEPENDENCE
REFRACTORY METAL COMPOUNDS
RHODIUM
RHODIUM COMPOUNDS
RHODIUM HYDRIDES
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
STORAGE
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WORK FUNCTIONS