Rotating ring-disc electrode oxygen reduction

E. Ahlberg, A.E. Broo, Oxygen reduction at sulphide minerals. 1. A rotating ring disc electrode (RRDE) study at galena and pyrite, Int. J. Miner. Process. 46 (1996) 73-89. 

Hsueh KL, Gonzalez ER, Srinivasan S (1983) Electrolyte effects on oxygen reduction kinetics at platinum a rotating ring-disc electrode analysis. Electrochim Acta 28(5) 691-697... 

Depending on the electrode material, the reduction of oxygen occurs by one or the other reaction pathway. The two reaction pathways may also take place in parallel. The most powerful technique for the quantitative determination of the extent of these reactions was proved to be the rotating ring-disc electrode voltammetry, which allows the detection of hydrogen peroxide on the ring electrode. 

Oxygen electro-reduction and evolution reaction/ cyclic voltammetry, rotating ring disc electrode (RRDE) Ni.Al,, Mn204 KOH solution Two preparation methods are used coprecipitation of metal hydroxides and sol-gel route using metal propionates were used. A Teflon-bound electrode technique was chosen with graphite addition The substitution of Al, by Ni increases the catalytic activity. Maximum activity is experienced by NiMn204 Ponce et al. (2001)... 

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... 

Oxygen is reduced at the rotating disc electrode and the potential of the concentric ring is set such that the oxidation of hydrogen peroxide is under mass transfer control. Plots are then made of the inverse of the observed collection efficiency versus the inverse of the square route of the rotation speed (in accordance with normal ROE theory). Linear plots are usually observed. Extrapolating to infinite rotation speed allows the prediction of the maximum possible collection efficiency. This is the maximum amount of hydrogen peroxide produced. In terms of the two possible reduction routes (equations 4 and 5 above) this gives the parameter x which is defined as. 

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