|Disclosed is a method for providing nanoporous palladium and platinum
powders. These materials were synthesized on milligram to gram scales by
chemical reduction of tetrahalo-complexes with ascorbate in a
concentrated aqueous surfactant at temperatures between -20.degree. C.
and 30.degree. C. The prepared particles have diameters of approximately
50 nm, wherein each particle is perforated by pores having diameters of
approximately 3 nm, as determined by electron tomography. These materials
are of potential value for hydrogen and electrical charge storage