Analytical expressions for overvoltage determination by the use of superimposed current pulses on constant Faradaic current. A useful expression for transient studies on O2/O3 evolving PbO2
✍ Scribed by Jordanis Thanos
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 314 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
In studies of the kinetics of oxygen and ozone, evolution by the electrolysis of water transient galvanostatic and impedance measurements were made. Under the existing high dc current densities, necessary to obtain substantial amounts of ozone, the treatments of the diffusion problems presented so far in the electrochemical literature are not directly applicable in the evaluation of the kinetic results. In this paper a critical theoretical account is given under which circumstances the existing equations may be used providing a more general solution to the galvanostatic step problem as used in transient measurements.
NOMENCLATURE
PO=, Po~ ~i, ~E CH+ t x
The subscripts "f", "cap" and "tot" to the current denote Faradaic, capacitive and total current, whereas low case symbols denote incremental values; e o r/= overvoltage, i = pulsed current.