Fuel Cell Matrix Material Study.
Final rept. 1 Nov 71-31 Oct 72,
IIT RESEARCH INST CHICAGO ILL
Pagination or Media Count:
The purpose of the program was to improve the resistance of chrysotile asbestos to potassium hydroxide at temperatures greater than 100C so that the asbestos would function satisfactorily as a matrix mat for hydrogen-oxygen fuel cells. Basic studies of the KOH-asbestos reaction revealed the reaction to be Mg3Si2O5 KOH 3 MgOH2 solubles silicates, the extent of reaction being a function of time, temperature, and KOH concentration. It was determined that the morphology of the MgOH2-asbestos reaction product could be maintained fibrous so that the desirable flexibility and capillarity for a matrix mat were retained. This was the basis for development of a highly converted material with a composition of approximately 85 MgOH2-15 asbestos, which exhibits good physical properties along with greatly improved chemical resistance to KOH. A second development in the studies was the capability to eliminate the KOH-asbestos reaction by addition of soluble potassium silicate to the system. Modified author abstract
- Physical Chemistry
- Electrochemical Energy Storage