The research is focused on the storage of hydrogen in
metals enhanced by means of physical or physico-chemical
agents. The effect of external electric fields, i.e. H2 plasmas, has been investigated on palladium.
The absorption of hydrogen by Pd wires has been studied
in the β phase, near room temperature and between 2 and 0.02 bar, under both tensile stress and tensile stress under cold H2 plasma.
Plasma is generated in a corona discharge regime by
applying a dc high voltage between the Pd wire and a
Three independent experimental quantities have been
simultaneously measured: hydrogen concentration, electrical
resistance and elongation of the wire. At constant H2 pressure, temperature, and tensile stress the hydrogen concentration under cold plasma is always higher.
Some of the most interesting results concerning positive corona are reported here, while a more detailed presentation
and discussion can be found in a recent publication , where thermodynamic treatment of data is also carried out.
At the present time we are performing measurements at
lower pressure (α+β phase) and characterizing the plasma with a Langmuir probe. Effects on other metals will be investigated in the near future.