Negatively and Positively Polarized Hydrogen Adspecies on Thin Platinum Films

• Authors: L. Nowicka , Z. Wolfram , R. Duś
• Languages of publication: EN

Abstracts

EN

Hydrogen adsorption on thin platinum films under isothermal conditions within the temperature and pressure intervals 78-298 K and 10^{-10}-10^{-2} Torr has been studied measuring simultaneously surface potential (SP) and pressure (P), by means of a sensitive, short response time apparatus. Two forms of hydrogen deposit of different electrical character have been distinguished. The first one arising at the beginning of adsorption decreases the surface potential, the second one following it increases the SP due to positively polarized adspecies formation. This positively polarized form is inhomogeneous as concerns binding energy. Hydrogen uptake associated with the decrease of SP becomes larger with increase of temperature. It seems that this β¯ form of the adsorbate stabilizes the positively polarized adspecies on the surface.

Keywords

EN

82.65.-i; 73.60.Aq

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1992
• Volume: 81
• Issue: 1
• Pages: 117-124

Dates

published

1992-01

received

1991-06-03

(unknown)

1991-09-04

Contributors

author

L. Nowicka

• Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland

author

Z. Wolfram

• Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland

author

R. Duś

• Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland

Identifiers

DOI

10.12693/APhysPolA.81.117