The perspective of hydrogen utilization as a clean fuel, mainly produced from renewable energy sources, compels the refinement of the water electrolysis process, thus reducing hydrogen generation costs. This paper presents the research now in progress at the Laboratório de Hidrogênio of the Univesidade Estadual de Campinas, consisting of tests of some materials for asbestos diaphragm substitution in water electrolyzers, their corrosion resistance being analyzed in highly alkaline media (28-30wt% KOH) and at a temperature of about 100 °C. The results obtained with polysulfone-coated asbestos tissues are also presented. The ionic conductivity of samples in KOH solution as well as their dimensional and weight variations for a period up to 1000 h were measured. The effect of bubbles in the cell conductivity was not investigated. Asbestos tissues were submitted to the same tests for comparison. © 1995.
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