Diaphragm for alkaline electrolysis and process for manufacture of diaphragm

Diaphragm for alkaline electrolysis of water, which diaphragm in use is sandwiched between two electrodes, said diaphragm comprising:

• a fine-pored predominantly ceramic layer having two opposite surfaces;
• a plurality of protuberances projecting outwardly by predetermined dimensions on said surfaces of said diaphragm;
• said protuberances comprising a plurality of coarse grains of known dimensional size between 10 and 250 microns and being partially embedded in and integrated into said opposite surfaces of said diaphragm;
• said coarse grains being disposed at an average center-to-center distance which has a relationship with said known coarse grain size;
• and
• disposing said first and second electrodes, in use, one on each of said opposite surfaces of said diaphragm, said electrodes being sandwiched with said ceramic layer of said diaphragm and being no farther from said surfaces of said diaphragm than said predetermined dimensions of said protuberances, thereby ensuring minimized energy requirements for said alkaline electrolysis of water.

Diaphragm for alkaline electrolysis of water, which diaphragm in use is sandwiched between first and second electrodes, said diaphragm comprising:

• a fine-pored predominantly ceramic layer having two opposite surfaces;
• a plurality of protuberances projecting outwardly by predetermined dimensions on said surfaces of said diaphragm;
• said protuberances comprising a plurality of coarse grains of known dimensional size between 10 and 250 microns and being partially embedded in and integrated into said opposite surfaces of said diaphragm;
• said coarse grains being disposed at an average center-to-center distance which has a relationship with said known coarse grain size;
• and
• said first and second electrodes, in use, being disposed one on each of said opposite surfaces of said diaphragm, said electrodes being sandwiched with said ceramic layer of said diaphragm and being no farther from said surfaces of said diaphragm than said predetermined dimensions of said protuberances, thereby ensuring minimized energy requirements for said alkaline electrolysis of water.