Electrochemistry in Near-Critical and Supercritical Fluids. 3. Studies of Br(-), I(-), and Hydroquinone in Aqueous Solutions

Electrochemistry in Near-Critical and Supercritical Fluids. 3. Studies of Br(-), I(-), and Hydroquinone in Aqueous Solutions

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: H2O/O2, I(-)/I2, Br(-)/Br2, and hydroquinone/benzoquinone. The compact, alumina flow-cell can be heated...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Flarsheim,William M, Tsou,Yu-Min, Trachtenberg,Isaac, Johnson,Keith P, Bard,Allen J
Format: Report
Sprache:eng
Schlagworte:
ANIONS
BROMINE
DIFFUSIVITY
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYSIS
ELECTROLYTES
FLUIDS
HIGH TEMPERATURE
Hydroquinone
IODIDES
IODINE
IONS
PHENOLS
Physical Chemistry
PLATINUM
REDUCTION
SOLUTIONS(GENERAL)
SOLUTIONS(MIXTURES)
SUPERCRITICAL FLOW
WATER
WUNR051693
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Beschreibung
Zusammenfassung: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: H2O/O2, I(-)/I2, Br(-)/Br2, and hydroquinone/benzoquinone. 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. See also 2, AD-A164 752.