Amtec power output optimization by investigating the grain size effect on its electrode materials

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Title: Amtec power output optimization by investigating the grain size effect on its electrode materials
Author: Briggs, Justin B.
Abstract: The Alkali Metal Thermal -to -Electric Converter (AMTEC ) is perhaps one of the most desirable devices for directly converting heat into electrical energy , particularly for space applications . There has been a lot of research in the past for improving this device . Since AMTEC has been intended for deep space use its stability is expected to last a long time , 15 years or more . The two major components responsible for power output of AMTEC are the electrolyte and the electrode . In this work we focus research on the AMTEC electrodes , which could be improved further to reduce the power degradation as the time goes by in using the AMTEC . This study aims at improving the performance of the electrode by looking into the changes of the material properties inherent to it with respect to time . These parameters refer to the grain growth involved in the grain mobility model for electrode materials . If the grain size of the electrode material reaches a certain dimension , about 750 nm , the power output starts degrading fast . This is very important because this condition should not occur until after 15 years and corresponds to a power degradation percentage of 10 % for different electrode materials . The electrode materials studied in this work are Mo , TiN , RhW , and . It was found that adjusting four different paramters for these electrode materials gave a power degradation between 3 % to 22 % .
URI: http : / /hdl .handle .net /2346 /22271
Date: 2006-12

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Amtec power output optimization by investigating the grain size effect on its electrode materials. Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /22271 .

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