Ring-disc electrodes. Part 2.—Theoretical and experimental collection effciencies

Abstract

A fundamental parameter for a ring disc electrode is N, the collection efficiency. An exact solution for N is derived by rigorously solving the convective diffusion equation with the proper boundary conditions. Experimental results obtained on six different electrodes are in excellent agreement with the predicted values of N. The new theory is compared with an earlier approximate treatment which, depending on the electrode geometry, may lead to errors of up to 25 %.

Dual band electrodes in generator–collector mode: Simultaneous measurement of two species

“…B − e − → A Collector electrode (6) Measuring the collection efficiency as a function of time yields information on the rate of the intermediate reaction, and hence the concentration of target analyte, W. Further studies by…”

Development of Rotating Liquid Membrane Disk Electrode and Rotating Liquid Membrane Ring-Liquid Membrane Disk Electrode and Evaluation of Characteristics of Ion Transfer Reactions at the Rotating AqueouslOrganic Solution Interface

“…The ratio of the magnitude of the peak current in curve 3 to that in curve 1 suggests that, when a species (TEA + in the present case) was released from the LMDE and transported by the convective diffusion to the LMRE, the efficiency of detection of the species at the LMRE was 0.35. 2,16 The efficiency was almost the same (0.34 to 0.35) for ω between 500 and 4000 rpm. In case of the ordinary rotating ring-disk solid electrodes' system, the efficiency of the detection of the species, which was produced at the disk electrode, at the ring electrode was reported to depend on the ratio of the radius of the disk electrode and the inner and outer radii of the ring electrode, and a theoretical equation for the detection efficiency was proposed.…”

“…In case of the ordinary rotating ring-disk solid electrodes' system, the efficiency of the detection of the species, which was produced at the disk electrode, at the ring electrode was reported to depend on the ratio of the radius of the disk electrode and the inner and outer radii of the ring electrode, and a theoretical equation for the detection efficiency was proposed. 2,16 When the dimensions of the LMRE-LMDE used in the present work were substituted for those in the theoretical equation, 0.38 was obtained as the efficiency. The reason why the efficiency obtained experimentally was smaller was considered to be that the surface of the LMRE-LMDE was not sufficiently flat and smooth.…”

Quantitative Kinetic Analysis of a PdAu3Alloy Catalyst for Oxygen Electro-Reduction

“…This geometry corresponds to a theoretical collection efficiency N = 0.3834. 33 A technology similar to the C substrates used here are carbon nitridebased electrocatalysts for the ORR applied in fuel cells. For a review on the topic see.…”

“…This feature of the rotating disk electrode is called uniform accessibility. 33 As a consequence, the concentrations are independent of ρ for ρ ≤ ρ 1 , and the corresponding derivative terms in the field Equations 8, 9 are dropped above the disk. Indeed, we checked and verified the applicability of this simplification by test simulations.…”