Non-first-order mechanisms

We have assumed above that the electron transfer steps are all first order. The general case has been treated by Filinovskii [179]. 

Making measurements at two rotation speeds enables the reaction orders Mi and M2 to be found. If we let 

Diagnostic criteria for the electroreduction of oxygen at the RRDE [from eqn. (148)] values of N0ijj/iR 

Equation (151) may also be used for determining jUj when the two disc reactions are in parallel however, in this case there is no simple expression for n2. 

Applications to disproportionation reactions, e.g. U(V) [180], and to determining the order of the electroreduction of oxygen at platinum [181] have been described. 

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