Accession Number : AD0451499


Title :   RESEARCH RELATING TO FUEL CELLS. PALLADIUM AND PALLADIUM-SILVER HYDROGEN DIFFUSION ELECTRODES.


Descriptive Note : Summary rept. (Final) 1 Oct 62-30 June 64,


Corporate Author : TYCO LABS INC WALTHAM MA


Personal Author(s) : Makrides, A C


Report Date : 31 Jul 1964


Pagination or Media Count : 106


Abstract : The concept of a solid-state diffusion electrode is described with particular reference to hydrogen diffusion electrodes utilizing Pd and Pd-Ag alloys. The thermodynamics of the H-Pd system are reviewed and the aspects relevant to diffusion electrodes are discussed in detail. An experimental study of the thermodynamics of Ag-Pd electrodes is presented. The potential of Ag-Pd alloys decreases, during absorption of hydrogen from aqueous solutions, to a value characteristic of the alloy; and after a time at this value, it drops gradually to zero. X-ray studies of Ag-Pd alloys charged with hydrogen show that the potential plateau corresponds to an alpha-beta transformation similar to that found with the H-Pd system. Alloys containing 30% or more silver do not show a potential plateau during the absorption of hydrogen, and the X-Ray studies indicate that a continuous expansion of the lattice occurs in this case. (Author)


Descriptors :   *FUEL CELLS , ELECTROCHEMISTRY , ELECTRODES , PALLADIUM , PALLADIUM ALLOYS , SILVER ALLOYS , HYDROGEN , DIFFUSION , VOLTAGE , MEMBRANES , PERMEABILITY , SORPTION , STATISTICAL MECHANICS , ALLOYS , X RAY DIFFRACTION


Distribution Statement : APPROVED FOR PUBLIC RELEASE