Alkali metal-refractory metal biphase electrode for AMTEC

Chemistry: electrical current producing apparatus – product – and – Process of cell operation

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429104, 429218, H01M 620

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active

048205966

ABSTRACT:
An electrode having increased output with slower degradation is formed of a film applied to a beta-alumina solid electrolyte (BASE). The film comprises a refractory first metal M.sup.1 such as a platinum group metal, suitably platinum or rhodium, capable of forming a liquid or a strong surface adsorption phase with sodium at the operating temperature of an alkali metal thermoelectric converter (AMTEC) and a second refractory metal insoluble in sodium or the NaM.sup.1 liquid phase such as a Group IVB, VB or VIB metal, suitably tungsten, molybdenum, tantalum or niobium. The liquid phase or surface film provides fast transport through the electrode while the insoluble refractory metal provides a structural matrix for the electrode during operation. A trilayer structure that is stable and not subject to deadhesion comprises a first, thin layer of tungsten, an intermediate co-deposited layer of tungsten-platinum and a thin surface layer of platinum.

REFERENCES:
patent: 3481787 (1969-12-01), Adlhart et al.
patent: 4505991 (1985-03-01), Weber
patent: 4547442 (1985-10-01), Besenhard et al.

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