Disclosed are a method for storing hydrogen, a method for generating hydrogen, a hydrogen storing device, and a hydrogen generating device. In a disclosed method for storing hydrogen, water that is treated so as to include hydrogen ions in a state the ions can be changed into protium is prepared, and hydrogen is stored by supplying a hydrogen-containing substance or a substance that generates hydrogen, for example, Mg, into the water. Preferably, the hydrogen-containing substance is sodium borohydride (NaBH 4 ). Preferably, the water is ionized hydrogen water treated with a metal hydride, and the metal hydride is at least one among an alkali metal, an alkaline earth metal, a group 13 metal, and a group 14 metal. A disclosed method for generating hydrogen generates hydrogen gas from the water by adding a substance that lowers pH of such water.
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