Rotating disk Disc Electrode

Figure 15. Rotating disk-ring electrode measurements for O2 reduction on Ru(1010) in 0.1 M HCIO4. Sweep rate 20 mV s ring potential E = 1.2 V disc area 0.282 cm rotation rates are indicated in the graph. The insert shows the logy Kjd-j) vs. E plot obtained for 1600 rpm. Reprinted from Copyright (2002) with permission from Elsevier.

A variant of the RRDE in which the ring is split into two parts (the rotating split ring-disk electrode) was invented to enable the detection of different intermediates produced at the disc electrode [32]. It was shown that the current at the ring segments is proportional to the length and that there is no interference between the segments [9, 33]. 

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... 

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