No and Yes. It dependes what you are looking for.
If you are interested in kinetics, then it is important just to provide significant stirring by what every means. You have to make sure that the convection does not affect your activity at the potential you are interested in.
BUT, if you are looking for diffusion properties, then a RDE is kind of vital.
Finding an appropriate mechanism of oxygen reduction reaction, without having kinetic parameters and intermediate specie is an impossible task. In view of the fact that this reaction is one of the important reactions, it will be overcome through computing the kinetic parameters by means rotating disc electrode in an acidic solution.
To obtain kinetic parameters, steady-state polarization data is a significant advantage. RDE provides a means to realizing steady-state mass transport conditions. Further, concentration effects on kinetics can be studied by simply increasing the rotation rate. RDE also allows you to determine solubility and diffusion coefficient of oxygen.
You might want to try a floating electrode. You can find the description in the following paper: "Electrocatalytic performance of fuel cell reactions at low catalyst loading and high mass transport", Phys. Chem. Chem. Phys., 2013, 15, 4329-4340.
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