Why bare GCE shows high Rct (80 k ohm) value? is this value acceptable?

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Abdellatif Ait Lahcen

Dear Dr Ranjita,

I think 80 kOhm is a very hight value of Rct. This result may be due to the surface of GCE which should be polished intensively using Alumina Gel followed with ultrasonication in ethanol/water. Moreover, this value of Rct could be attributed to the concentration of the electrolyte solution.

All the very best

With kind regards

Abdellatif

Ranjita Tandel

Thank you very much Dr. Abdellatif for clearing my doubt. i will check the results again.

António Maximiano Fernandes

Cleaning is critical step. Some day we should spend time to do it. After polishing remove all AL resíduos with ddwater