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|Title: ||(abstract) Fundamental Mechanisms of Electrode Kinetics and Alkali Metal Atom Transport at the Alkali Beta"-Alumina/Porous Electrode/Alkali Metal Vapor Three Phase Boundary|
|Authors: ||Williams, R.M.|
Ryan, M. A.
|Issue Date: ||12-Sep-1993 |
|Citation: ||The Hague, The Netherlands|
|Abstract: ||The mechanisms of electrode kinetics and mass transport of alkali metal oxidation and alkali metal cation reduction at the solid electrolyte/porous electrode boundary as well as alkali metal transport through porous metal electrodes has important applications in optimizing device performance in alkali metal thermal to electric converter (AMTEC) cells which are high temperature, high current density electrochemical cells. Basic studies of these processes also affords the opportunity to investigate a very basic electrochemical reaction over a wide range of conditions; and a variety of mass transport modes at high temperatures via electrochemical techniques. The temperature range of these investigations covers 700K to 1240K; the alkali metal vapor pressures range from about 10<SUP>-2</sup> to 10<SUP>2</sup> Pa; and electrodes studied have included Mo, W, Mo/Na<SUB>2</sub>MoO<SUB>4</sub>, W/Na<SUB>2</sub>WO<SUB>4</sub>, WPt<SUB>x</sub>, and WRh<SUB>x</sub> (1.0 < x < 6.0 ) with Na at Na-beta"-alumina, and Mo with K at K-beta"-alumina. Both liquid metal/solid electrolyte/alkali metal vapor and alkali metal vapor/solid electrolyte/vapor cells have been used to characterize the reaction and transport processes. We have previously reported evidence of ionic, free molecular flow, and surface transport of sodium in several types of AMTEC electrodes.|
|Appears in Collections:||JPL TRS 1992+|
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