Electrochemical desorption of hydrogen atoms adsorbed on liquid gallium
Laser-pulse electron photoemission was used to measure absolute values of the rate constants, W/sub 3/, of electrochemical desorption (ECD) of hydrogen atoms from liquid gallium. The W/sub 3/ were shown to be a linear function of hydrogen concentration, in accord with the fact that both hydrogen ions and water molecules are involved in desorption. The components of W/sub 3/ arising from the two reaction channels are exponential functions of electrode potential, and in their order of magnitude (approx. 10/sup 8/ liter/mole x sec and approx. 10/sup 6/ sec/sup -1/) are close to the corresponding constants for mercury and bismuth. In the desorption involving hydrogen ions, the H/D isotope effect decreases from 5 to 3 as the overpotential is raised from 0.75 to 1.15 V. It was suggested that isotope effects which are higher than those found for Hg and Bi electrodes arise from longer proton tunneling distance.
- Research Organization:
- Institute of Chemical Physics, Moscow (USSR)
- OSTI ID:
- 7004333
- Journal Information:
- Sov. Electrochem. (Engl. Transl.); (United States), Vol. 23:6; Other Information: Translated from Elektrokhimiya; 23: No. 6, 755-760(Jun 1987)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DEUTERIUM
DESORPTION
ISOTOPE EFFECTS
PHOTOEMISSION
GALLIUM
SORPTIVE PROPERTIES
HYDROGEN
CAPTURE
CHEMICAL REACTION KINETICS
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRON EMISSION
HYDROGEN COMPOUNDS
LASER RADIATION
LIQUID METALS
REDUCTION
WATER
CHEMICAL REACTIONS
CHEMISTRY
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
FLUIDS
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
LIQUIDS
METALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
RADIATIONS
REACTION KINETICS
SECONDARY EMISSION
STABLE ISOTOPES
SURFACE PROPERTIES
400400* - Electrochemistry
400202 - Isotope Effects
Isotope Exchange
& Isotope Separation
656003 - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)