The standard rate constant of the first reduction step of oxygen in sodium fluoride solutions of different alkalinities

A faradaic impedance study of the reduction of oxygen from aqueous alkaline solution at the dropping mercury electrode

“…The value of the apparent rate constant, k~h = 0.035 cm s -1, obtained from our measurements, at first sight fits reasonably well in the series of values reported by Moussa et al [9] for the pH range 8.8--12.17: k~h = 0.015--0.052 cm s -1 (the authors do not give any explanation to the much higher value, kah = 0.474, obtained at pH = 12.58). However, their calculation of the rate constant appears to be based on an erroneous equation for the quantity R, --1/¢oC~, which in our notation must be equal to the transfer resistance Rot.…”

“…To our knowledge the only impedance study of the oxygen reduction at mercury published thus far is that of Moussa et al [9]. The pH-range covered in this study is from 8.8 to 12.58, but the kinetic analysis is restricted to measurements at one frequency (1000 Hz) and one potential {apparently the "peak potential" in the pseudo-capacitance vs. potential plot).…”