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Platinum Metals Rev., 1975, 19, (4), 145

Palladium Flakes for Hydrogen Solid Storage Applications

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Hydrogen appears capable of playing an important role in the provision of energy for the future. Whether it will provide all the answers to the world’s fuel problems, as some believe, is open to discussion but it is certainly unlikely that it will quickly realise its full potential unless the problems which its exploitation will produce are anticipated and solutions to these problems found. Forward looking organisations throughout the world are now investigating many different aspects of hydrogen energy. A recent article by R. M. German and V. Ham, of the Sandia Laboratories, Livermore, California (Internat. J. Powder Metall. Powder Technol., 1975, 11, (2), 97–100) outlines and discusses a technique for the production of submicron thick metal flakes which appear potentially attractive for hydrogen solid storage applications.

On account of their hydride properties palladium and erbium were selected for investigation. In the case of the palladium, where pure sponge was the starting material, the process was carried out in ethyl alcohol using argon as a cover gas in an attrition mill containing 0.6 cm diameter hardened steel balls and running at a reduced speed of 60 r.p.m., which was found to minimise the disintegration of the flakes. Palladium has the advantage of flaking more readily than erbium and giving a considerably higher aspect ratio. Flakes having short diffusion paths, but without the handling properties generally associated with ultrafine powders, produced by this process have now been provided for hydrogen solid storage studies.

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