Patents
The invention relates to a process for the preparation of Calcium silicate Hydrate anion exchange membrane (cement paste) with an ionic conductivity of the order of 10-3 S/cm. The membrane can be formulated by mixing Ordinary Portland Cement (OPC) and water with the cement to wafer ratio of 1:0.45. After initial setting time, the membrane undergoes curing in 7% calcium chloride solution and the C1 ions in the membrane is converted to OH form by immersing into saturated Ca(OH)2 solution with pH 14 and it has been washed to remove the excess alkali. This membrane has high mechanical strength (Ultimate Tensile Strength: 6.3MPa) and does not deteriorate even at high temperature (upto 450oC) and alkaline atmosphere (pH 11.5-14). Also disclosed is a method of producing in-situ formation of membrane electrode assembly. This invention encompasses a process for producing and using the membrane in water electrolysis and fuel cell.