A rotating ring-disk electrode (RRDE) has a ring electrode around the central disk, separated by a thin insulating gap. During rotation, products formed at the disk flow outward over the ring, which is held at its own potential to capture and measure them. A typical use is measuring the hydrogen peroxide (H₂O₂) formed during oxygen reduction (ORR) and the electron transfer number; a bipotentiostat is required.
This model is compatible with common Japanese-type rotators: Ø4 mm disk, platinum ring with 5 mm inner / 7 mm outer diameter, and PTFE body (Ø12 mm). The share of disk product caught at the ring is the collection efficiency (N); for this geometry the theoretical N is about 42%. Disk: glassy carbon, platinum or gold. The US-type model differs in disk/ring size and connection, so its N also differs.
| Electrode type | Rotating ring-disk electrode tip, Japanese type (rotator not included) |
| Compatibility | Common Japanese-type rotators |
| Disk | Ø4 mm; glassy carbon, platinum or gold |
| Ring | Platinum; 5 mm inner / 7 mm outer diameter (manufacturer data) |
| Geometric disk area | 0.126 cm² |
| Collection efficiency (N) | Theoretical ≈ 42% (calculated from geometry) |
| Collection efficiency definition | N = |ring current| / |disk current|; verified experimentally with a reversible redox couple such as ferri/ferrocyanide |
| Body | PTFE, Ø12 mm; tip length 25 mm (manufacturer data) |
| Required equipment | Bipotentiostat (two working electrode channels for disk and ring) and a compatible rotator |
| Custom production | Gold ring; high-temperature (300 °C) version: on request |
| Type and Material | Description |
| Japan Type - Glassy Carbon 4 mm | Rotating ring-disk electrode with platinum ring, japan type - glassy carbon 4 mm |
| Japan Type - Platinum 4 mm | Rotating ring-disk electrode with platinum ring, japan type - platinum 4 mm |
| Japan Type - Gold 4 mm | Rotating ring-disk electrode with platinum ring, japan type - gold 4 mm |
For sizes and specifications not listed above, you can request a custom quotation through the Quote Form.
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