| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve an effective water electrolyzing process while preventing high-pressure hydrogen from being leaked on anode side and remaining after the water electrolysis apparatus is shut down, and thereby preventing deterioration of a catalytic electrode. <P>SOLUTION: This invention relates to a method for shutting down a water electrolysis apparatus, in which current collectors are disposed on both sides of an electrolyte membrane and an electrolysis voltage is applied between the current collectors to electrolyze water to generate oxygen in an anode electrolysis chamber and hydrogen in a cathode electrolysis chamber under a pressure higher than a normal pressure. The method includes steps of: applying a voltage between the current collectors after the cathode electrolysis chamber stops supplying the hydrogen; reducing a pressure in at least the cathode electrolysis chamber while the voltage is being applied; and stopping applying the voltage when the pressure in the cathode electrolysis chamber is equal to a pressure in the anode electrolysis chamber. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
