Hydrogen interaction with Ni(100): a static secondary ion mass spectroscopy study
The kinetics of hydrogen adsorption and desorption on Ni(100) was studied by static secondary ion mass spectroscopy (SSIMS). Hydrogen coverage on Ni(100) can be quantitatively followed by monitoring the SSIMS ion ratio (Ni/sub 2/H/sup +//Ni/sup +/), which varies linearly with hydrogen coverage over a broad range. Isothermal hydrogen uptake and decay curves are readily obtained, from which kinetic and thermodynamic parameters are extracted. The adsorption and desorption processes are adequately described by kinetic equations that are third-order in empty sites and second-order in hydrogen coverage, respectively. The calculated initial sticking coefficient (0.29) was independent of surface temperature. An activation energy of 22.7 +/- 0.2 kcal/mol and a preexponential factor of 0.09 +/- 0.04 cm/sup 2//(atom s) were obtained for hydrogen desorption from clean Ni(100). The heat of adsorption calculated from steady-state coverage data was 22.7 +/- 0.4 kcal/mol.
- Research Organization:
- Univ. of Texas, Austin (USA)
- OSTI ID:
- 6281475
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:13; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION
ADSORPTION HEAT
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
DATA
DESORPTION
ELEMENTS
ENERGY
ENTHALPY
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
ION MICROPROBE ANALYSIS
KINETICS
MASS SPECTROSCOPY
METALS
MICROANALYSIS
MILLER INDICES
NICKEL
NONDESTRUCTIVE ANALYSIS
NONMETALS
NUMERICAL DATA
PHYSICAL PROPERTIES
REACTION KINETICS
SORPTION
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS