Electrochemistry in Near-Critical and Supercritical Fluids. 3. Studies of Br(-), I(-), and Hydroquinone in Aqueous Solutions.
TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
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A new type of apparatus has been constructed for carrying out electrochemistry in nearcritical and supercritical aqueous solutions. The following systems have been studied at a platinum electrode H2OO2, I-I2, Br-Br2, and hydroquinonebenzoquinone. The compact, alumina flow-cell can be heated or cooled quickly, and can be recharged with fresh electrolyte solution while at high temperature and pressure. A large reduction in the potential required for the electrolysis of water was observed. Diffusivities have been measured for iodide ions and hydroquinone. General agreement with the Stokes-Einstein model was observed in the temperature range 25 C to 375 C.
- Physical Chemistry