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Title: Electrode performance parameters for a radioisotope-powered AMTEC for space power applications

Journal Article · · Journal of Propulsion and Power; (United States)
DOI:https://doi.org/10.2514/3.23564· OSTI ID:7071670

The alkali metal thermoelastic converter (AMTEC) is a device for the direct conversion of heat to electricity. Recently a design of an AMTEC using a radioisotope heat source was described, but the optimum condenser temperature was hotter than the temperatures used in the laboratory to develop the electrode performance model. Now laboratory experiments have confirmed the dependence of two model parameters over a broader range of condenser and electrode temperatures for two candidate electrode compositions. One parameter, the electrochemical exchange current density at the reaction interface, is independent of the condenser temperature, and depends only upon the collision rate of sodium at the reaction zone. The second parameter, a morphological parameter, which measures the mass transport resistance through the electrode, is independent of condenser and electrode temperatures for molybdenum electrodes. For rhodium-tungsten electrodes, however, this parameter increases for decreasing electrode temperature, indicating an activated mass transport mechanism such as surface diffusion. 21 refs.

OSTI ID:
7071670
Journal Information:
Journal of Propulsion and Power; (United States), Vol. 8:4, Issue 4; ISSN 0748-4658
Country of Publication:
United States
Language:
English