Supersaturation of oxygen in acidic solution in the vicinity of an oxygen-evolving platinum anode |
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Authors: | S Shibata |
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Affiliation: | Department of Chemistry, College of General Education, Tohoku University, Kawauchi, Sendai 980, Japan |
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Abstract: | The concentration of O2 in 1 M H2SO4 solution in the vicinity of the O2-evolving smooth Pt anode was measured as a function of anodic cdia using the galvanostatic potential—transient method.The solution near the O2-evolving anode was supersaturated with O2. When the anodic current was interrupted, supersaturated concentration C* decreased at a rate proportional to C* C0, where C0 is the solubility of O2 in the electrolyte at 1 atm. The rate constant of the decay of the supersaturation under the open circuit condition was measured to be 0.069 sec?1 at 25°C.At ia < 40 mA/cm2 there was a linear relation between log(C* C0) and log ia. At ia > 200 mA/cm2, however, the supersaturation exhibited a limiting value of 9.0 × 10?2 mol/l. |
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