The effect of hydrogenation/dehydrogenation cycles on palladium physical properties |
| |
Authors: | Paolo Tripodi Nicolas Armanet Alessandro Avveduto Jenny Darja Vinko |
| |
Institution: | a H.E.R.A., Hydrogen Energy Research Agency, Corso della Repubblica 448, 00049 Velletri, Italy b University of Rome “Tor Vergata”, Physics Department, Via della Ricerca Scientifica 1, 00133 Rome, Italy c Fondazione Fulvio Frisone, Via Etnea 73, 95124 Catania, Italy d CNRS, Aix-Marseille Université, CINAM-UPR3118, Campus de Luminy, 13288 Marseille cedex 09, France |
| |
Abstract: | A series of hydrogenation/dehydrogenation cycles have been performed on palladium wire samples, stressed by a constant mechanical tension, in order to investigate the changes in electrical and mechanical properties. A large increase of palladium electrical resistivity has been reported due to the combined effects of the production of defects linked to hydrogen insertion into the host lattice and the stress applied to the sample. An increase of the palladium sample strain due to hydrogenation/dehydrogenation cycles in α→β→α phase transitions is observed compared to the sample subjected to mechanical tension only. The loss of initial metallurgical properties of the sample occurs already after the first hydrogen cycle, i.e. a displacement from the initial metallic behavior (increase of the resistivity and decrease of thermal coefficient of resistivity) to a worse one occurs already after the first hydrogen cycle. A linear correlation between palladium resistivity and strain, according to Matthiessen's rule, has been found. |
| |
Keywords: | Palladium wire Hydrogen cycles Electrolysis Resistivity Stress Strain |
本文献已被 ScienceDirect 等数据库收录! |
|