Abstract: , A divided cell for the electrolysis of water comprises an anode chamber provided with an anode and containins an anolyte; a cathode chamber provided with a cathode and containing a catholyte, said chambers being divided by a separator disc characterised in that the said disc is a carbon coated microporous glass sintered disc obtained by the immersion of the disc in a saturated solution of sucrose in water along with less than 1 % by weight of ammonium nitrate; by rem oval of excess solution by washing with deionised water; and by heating of the disc in an oven for about 3 -4 hours at about 150 -200 degree C.; and further c~aracterised in that the anode chamber contains an alkali anolyte and the cathode chamber contains an acid catholyte.