Direct hydrogen production from seawater by using amine group grafted silica gel adsorbent

The present invention relates to a hydrogen production technology, and more particularly, to a chloride ion adsorbent, method for manufacturing the adsorbent, and method for direct hydrogen production from seawater using the adsorbent. The present invention which makes it possible to solve the problem of using non-desalinized seawater. That is, a feed of the chloride ion adsorbent to a reactor containing seawater for electrolysis can increase the overall efficiency of the electrolysis and will prevent the lifetimes of the electrode and structural components of the reactor from being shortened due to corrosion and contamination since the generation of chlorine gas (Cl₂) is inhibited by the chloride ion adsorbent while producing hydrogen without treating seawater to freshwater. In the absence of the chloride ion adsorbent, otherwise, a large amount of chloride ions (Cl-) will be oxidized during electrolysis due to NaCl dissolved in a large amount in seawater.