Accession Number : AD0761512

Title :   Fuel Cell Matrix Material Study.

Descriptive Note : Final rept. 1 Nov 71-31 Oct 72,

Corporate Author : IIT RESEARCH INST CHICAGO ILL

Personal Author(s) : Crandall,William B. ; Harada,Yoshiro

Report Date : MAY 1973

Pagination or Media Count : 67

Abstract : 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 Mg(OH)2 + solubles silicates, the extent of reaction being a function of time, temperature, and KOH concentration. It was determined that the morphology of the Mg(OH)2-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% Mg(OH)2-15% 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)

Descriptors :   (*FUEL CELLS, ASBESTOS), (*ASBESTOS, CHEMICAL REACTIONS), HYDROXIDES, THERMAL STABILITY, TEMPERATURE, BARRIER COATINGS

Subject Categories : Physical Chemistry
      Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE