A very thin ring electrode (VTRE) inlaid in an insulating glass plane has been fabricated and studied. Its inner radius was 4 mm and its width was 0.7 ~m. Current-potential and current-time behavior for the reduction of ferricyanide in potassium chloride and iodine in excess iodide were studied at the rotating and the stationary very thin ring electrode. Comparison of the electrochemical data with theory indicated that the ring electrode was approximately 0.3 ~m below the surface of the insulating plane. This conclusion was verified by means of scanning electron microscopy.Recessed rotating disk electrode.--In our model, we as-

The term recombination efficiency has been applied throughout the literature to sealed, lead‐acid batteries that operate on the principle of the “oxygen cycle.” In these systems oxygen gas from the positive electrode is recombined at the negative electrode and the evolution of hydrogen is suppressed. Present definitions describe only in part the true state of the overcharge processes in these systems. A complete material balance is described which accounts for overcharge and rigorously defines recombination efficiency in terms of both oxygen recombination and hydrogen suppression. This material balance is applied to data from non‐antimonial, sealed, gelled‐electrolyte, lead‐acid batteries.

No abstract

No abstract

This work was partially supported by the Belgian Ministry of Science Policy under Contracts 80-85/10 and 84-89/69. L. Van't dack carried out the coal analyses.