It depends what you want to study. RDE is often sufficient for studying an electrochemical reaction with LSV, CV... and take into account the mass transfer.

RRDE can give more information on the mechanisms of the reaction and intermediate products. Indedd with RRDE, you use 2 working electrodes : disk and ring. Depending what you study, you can do a CV on the disk and impose the potential on the ring for example. In this case, the components produced during the CV can be reduce or oxidized at the ring.

So RDE and RRDE are 2 methods very different and don't give the same information.

I hope my answer will help...

Regards,

Tom

It might simply be a matter of available instrumentation. For RRDE measurements you need a bi-potentiostat. Not everyone has one available. Kind regards

Peter

The RRDE only really comes into its own if you're trying to detect a soluble intermediate in the electrode reaction on the disc, or for time-of-flight dynamic measurements and monitoring e.g oxidation states of films on modified electrodes. The ring electrode current (or potential) is way more sensitive to any eccentricities than the disc, so reliable quantitative data can be challenging to obtain. Finally, even if the ring is not connected, it is possible that it may not be as inert to the electolyte solution as an insulating mantle would be.

It depends what you want to study. RDE is often sufficient for studying an electrochemical reaction with LSV, CV... and take into account the mass transfer.

RRDE can give more information on the mechanisms of the reaction and intermediate products. Indedd with RRDE, you use 2 working electrodes : disk and ring. Depending what you study, you can do a CV on the disk and impose the potential on the ring for example. In this case, the components produced during the CV can be reduce or oxidized at the ring.

So RDE and RRDE are 2 methods very different and don't give the same information.

I hope my answer will help...

Regards,

Tom