Accession Number : AD0737774

Title :   Etude Cinetique de quelques Cellules Electrochimiques de Metaphosphate de Sodium (NaPO3) Fondu (A Kinetic Study of Some Electrochemical Cells Using Molten Sodium Metaphosphate (NaPO3),

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Casey,E. J. ; Dubois,A. R.

Report Date : 23 APR 1971

Pagination or Media Count : 14

Abstract : Interest in the possible use of molten metaphosphates as electrolyte and as reactant in electrochemical cells has been examined from the points of view of both electrochemical synthesis and sources of electrical energy. Both are shown to be possible. The anodic evolution of O2 from carefully dried molten NaPO3 on Pt shows hysteresis in the V/I curve, and also shows Tafel behavior. On Ni the phosphide Ni12P5 predominates as the autocorrosion product. This material is actively reduced if electrochemically coupled with Ca, and can be electrochemically oxidized by O2. Forced electrolysis inserts extra nickel into a phosphide anode, or phosphorus into a phosphide cathode. Reactions and mechanisms are proposed for the various processes, including a phosphate shuttle to account for loss of charge.

Descriptors :   (*ELECTROCHEMISTRY, *PHOSPHATES), SODIUM COMPOUNDS, ELECTROLYTES, OXYGEN, NICKEL COMPOUNDS, PHOSPHIDES, REACTION KINETICS, CANADA

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE