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what is the most efficient way to produce hydrogen out water with electrolysis?

I am alredy performing electrolysis out of water with stailess steel electrodes 12V of current with 12 Amp, but I am getting very low ammount. Tryed sulfuric acid and salt it seems to be better but still not enough. I saw that professional hydrogen generators will produce 55CM2 of 9.999 pure hydrogen per minute out of destiled water. so I am just more confused here.