| 摘要 |
PURPOSE:To obtain H2 together with I2 or Br2 at a low voltage by carrying out the electrolysis of HI or HBr in a vapor phase using an electrolytic cell contg. a porous holding matrix impregnated with phosphoric acid as an electrolyte between electrodes. CONSTITUTION:Said known electrolytic cell is used as a fuel cell, gaseous HI is introduced into the anode chamber, and vapor phase electrolysis is carried out. I2 produced on the anode is slightly soluble in concd. phosphoric acid. Gaseous H2 is generated from the cathode chamber. When gaseous HI contg. steam is introduced, the steam is dissolved in phosphoric acid on the anode side and shifts to the cathode side in accordance with the difference between the anode and cathode chambers in the partial pressure of steam, and it is evaporated on the cathode side. Accordingly, H2 obtd. from the cathode chamber contains steam, yet the steam can be separated by condensation. Since the transfer of steam in the electrolytic chambers facilitates the transfer of H<+>, the current density can be increased in the presence of steam contained in gaseous HI. |
