I assume you're referring to a porous/high surface area electrode because you mentioned analytes going "into" it. If it's a glassy carbon electrode, you should use mechanical polishing with aluminum oxide slurry. If it's platinum or gold, you can use cyclic voltammetry in 0.5 M H2SO4.

Dear all

thanks so much.

Dear Effat: It is not so much the penetration of contaminants inside the electrode. You have some alternatives, between them, scan from 0 V up to +1,5 V ( during 2 or 3 minutes) the electrode in NaOH 1 M. After, wash very well with abundant water. Previously, you must clean with diamond paste, to clean using ultrasonic and polish the surface carefully. In this case, you must obtain a signal, with few current density of double layer and without any peak.

Regards

Also, the before pocedure not only clean, funcionalyze the electrode surface. This means enrich with electrones the surface and benefit The electronic transference. 

Regards

Hi

the problem is you do not mention which kind of electrode you use?!!

if it is carbon electrode, you have to polish it and then clean in ultrasonic bath

if it is just Pt or Au, there are many ways to clean them, the simplest way is to flame annealing even using normal bunsen flame.

if you can provide more information about your electrode it will be easier for all reader to answer your question

please use very thin emery paper for GCE,

after that, you can carefully polish GCE surface.

Dear Alaa A.EI-Shafei

screen-printed carbon electrode used in research was prepared in-house by screen-printig carbon ink onto a PVC substrate.

Gold cleaning methods for electrochemical detection applications

M\icroelectronic Engineering 86(2009) 1282-1285.

Some methods show how to clean the gold electrode surface in this article.