Rotating ring-disk electrode following reaction

Both p,p -DDT and methoxychlor are rapidly deprotonated by HO in aprotic solvents with subsequent elimination of Cl to form the dehydrochlorination products that is, DDT forms DDE (Scheme 7-6). The same products are formed in their reactions with 02 -. Because the reaction rates that are measured by the rotated ring-disk electrode method are fairly rapid, the primary step must be a direct reaction with 02 - and not with HO [from the reaction of 02 - with trace water in the solvent (2 02 - + H2O - 02 + HOO + HO )]. Hence, the initial reaction with 02 - is deprotonation followed by elimination of Cl to form DDE. 

The reduction of oxygen has been investigated over either unsubstituted or partially substituted perovskites (6, 234-247). Matsumoto et al. (240) used a rotating ring-disk electrode that consisted of a LaNi03 disc and a Pt-ring electrode. These authors proposed the following reactional... 

This question cannot be answered by measuring only the photocurrent because the latter depends only on the light intensity. More specific information can be obtained by chemical analysis or by application of a special rotating ring-disk electrode system. The latter consists of a semiconductor disk and a Pt ring as the collector electrode. Taking redox processes at n-type CdS electrodes as an example, one can discriminate between alternative courses of reactions at the semiconductor disk electrode as follows ... 

Prater KB, Bard AJ (1970) Rotating ring-disk electrodes. II Digital simulation of first and second-order following chemical reactions. J Electrochem Soc 117 335-340... 

The analysis of the parallel-series reactions according to this scheme has been developed for the rotating disk-ring method by Bagotskii et al, The equations relating the ratio of currents at the disk Id) and the ring Ir) to the electrode rotation rate o> are as follows ... 

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