β Scribed by N.R.K. Vilambi; E.J. Taylor
No coin nor oath required. For personal study only.
We quantitatively detected the formation of peroxide during oxygen reduction on oxidized platinum in alkaline media, using the rotating ring+lisc electrode (rrde) technique and the cyclic potential ring measurement (CPRM) method. In the CPRM technique, the ring electrode is continuously cleaned by sweeping it anodically and cathodically to the peroxide detection potential. In this manner, the peroxide intermediate formed during oxygen reduction at the disc electrode is quantitatively detected. Using the CPRM technique we measured ring currents representing larger fractions of peroxide formation at the disc compared to previously reported values using the conventional technique. We measured peroxide yields of S&60% of the disc current, compared to peroxide yields of-20-25% using the conventional rrde technique. We conclude that peroxide has a greater role in oxygen reduction on oxidized platinum in alkaline media than previously reported.
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The kinetics of hydrogen peroxide reduction were studied on iron in borate buffered and unbuffered solutions of pH ranging from 8.6 to 13.8, with and without the presence of chloride ions. A rotating disk electrode was employed. Measurements were taken using the linear sweep technique and the potent
Periodic potentiostatic current/potential curves have been measured at 30Β°C on platinumgold alloys with gold contents from 5 to 70 at. % in N HsS04 and N HCIOp at 30 and 300 mV/s. The curves exhibit a characteristic shape with two reduction waves during the cathodic sweep, To a first approximation t