Dear J. C. Herrera,

In MT investigations, porous pots are better choice over conventional metal rod electrodes because of their high performances at low frequencies (typically frequencies below 1 Hz). Typically, Ag, which occupy lowest position on the electrochemical series should have better conductivity and consequently, generate less noise on weak signals that are common in low frequency MT records. Therefore, porous pots electrodes with Ag-AgCl salts are better choices for MT investigations particularly, in land surveys. However, because of the high cost of Ag-AgCl, they are not commonly used in the design of electrodes. Their use is therefore limited to marine surveys.

I hope my response will be helpful to you.

Thanks Anthony E. Akpan

In magnetotellurics, capacitive electrodes can be coupled with triaxial induction coil sensor for audio-frequency magnetotelluric and controlled-source audio-frequency magnetotelluric signal measurements. For better conductivity silver electrodes are usually preferred.

Thanks Nyakno jimmy George

Cd-CdCl2 good

Thanks Osman metin Ilkışık

I have had better results with Ag-AgCl2 but Cd-CdCl is usually adequate.

Thanks Ernest Berkman

you can find more information about electrodes and much more in

http://www.complete-mt-solutions.com/mtnet/papers/ClassicPapers/classic_papers.html

Ag-AgCl(2) electrodes. Very good conductor. Low temperature effect . lesser noise in data.