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Hydrogen Absorption in Pd-Ag Systems: A TPD and Electrical Resistivity Study.

Alfonso Pozio¹, Zoran Jovanovic^2,3, Silvano Tosti⁴

¹Department of Energy Technologies, ENEA Casaccia Research Center, Via Anguillarese 301, 00123 S. Maria di Galeria (Rome), Italy. alfonso.pozio@enea.it.

Materials (Basel, Switzerland)

|October 2, 2019

Summary

This study investigates hydrogen retention in palladium-silver (Pd-Ag) thin foils using temperature-programmed desorption and resistivity measurements. Two distinct hydrogen absorption sites, tetrahedral and octahedral, explain the observed S-shaped resistivity curve.

Keywords:

Pd–Ag alloy electrical resistivity hydrogen temperature-programmed desorption

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Area of Science:

Materials Science
Physical Chemistry
Surface Science

Background:

Palladium alloys are crucial for hydrogen storage and catalysis.
Understanding hydrogen-metal interactions is vital for material performance.
Resistivity changes offer insights into hydrogen absorption dynamics.

Purpose of the Study:

To elucidate hydrogen retention mechanisms in Pd-Ag thin foils.
To correlate hydrogen uptake with electrical resistivity changes.
To explain the characteristic S-shaped resistivity curve and its minimum.

Main Methods:

Temperature-Programmed Desorption (TPD) from 25-200 °C.
Electrical resistivity measurements under argon, hydrogen, and vacuum.
Analysis of hydrogen desorption peaks and resistivity minima.

Main Results:

Maximum hydrogen uptake observed between 65-105 °C (peak at ~85 °C).
Hydrogen desorption peaks consistently found between 140-180 °C.
Evidence of two hydride types: weak (tetrahedral sites, T < 70 °C) and strong (octahedral sites, up to 150 °C).

Conclusions:

The S-shaped resistivity curve and its minimum are attributed to two distinct hydrogen absorption states.
Hydrogen occupies both tetrahedral and octahedral sites in the Pd-Ag lattice.
This research provides a mechanistic understanding of hydrogen behavior in Pd-Ag alloys.