First-order collection efficiencies at the double channel electrode

3 First-order collection efficiencies at the double channel electrode 

Braun [39] derived the following equation which has been shown to be approximately true only for very thin gap electrodes by using the same approach as Albery and Bruckenstein for the RRDE [cf. eqn. (204)] 

Since then, numerical solution by Matsuda and co-workers [232] has allowed accurate values of the collection efficiency to be calculated over a wider range of electrode geometries. The following approximate equations hold to within a few per cent. 

The numerical coefficients have been tabulated [232]. Rate constants are extracted from working curves constructed using these equations and there is reasonable agreement between experiment and theory [233]. The range of measurable rate constants is very similar to that at the RRDE. 

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