Everything about Palladium Hydride totally explained
Palladium hydride is metallic
palladium that contains a substantial quantity of
hydrogen within its
crystal lattice. At
room temperature and
atmospheric pressure, palladium can
absorb up to 900 times its own volume of hydrogen. This process is reversible. This property has been investigated because hydrogen storage is of such interest and a better understanding of what happens at the molecular level could give clues to designing improved
metal hydrides. A palladium based store would be however prohibitively expensive due to the cost of the metal. Palladium electrodes have been used in some cold fusion experiments, under the hypothesis that the hydrogen could be "squeezed" between the palladium atoms to help them fuse at lower temperatures than would otherwise be required. No cold fusion experiments have achieved conclusive positive results, however, and the theoretical ability of palladium to accomplish this is in dispute.
History
The absorption of hydrogen gas by palladium was first noted by
T. Graham in 1866 and absorption of electrolytically produced hydrogen, where hydrogen was absorbed into a palladium cathode, was first documented in 1939. The reason for such a behaviour and the particular structure of trimers has been analyzed.
Uses of palladium hydride
The absorption of hydrogen is reversible and is highly selective. Industrially a palladium based diffuser separator is used. Impure gas is passed through tubes of thin walled silver-palladium alloy. Hydrogen and deuterium readily diffuse through the alloy membrane. The gas that comes through is pure and ready for use. Palladium is alloyed with silver to improve its strength. To ensure that the formation of the beta phase is avoided, as the lattice expansion noted earlier would cause distortions and splitting of the membrane, the temperature is maintained above 300°C.
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