Dear all,
I have commercially available screeen printed gold (220BT) and carbon electrodes (110) by Dropsens. The reference electrode is made of silver in both of them. What is the best way to chlorinate it so as to achieve a Ag/AgCl reference electrode. I have tried the method with FeCl3 (1% solution for 1 minute). The surface did not get darker and no significant differences were observed when the 'chlorinated' electrodes were interrogated by CV in a ferri/ferro buffer (not really sure whether I should expect any differences). Do you have any other suggestions?
And further to this how different is the behaviour of the silver and silver/silver chloride as reference electrodes? Most publications state applied potentials vs Ag/AgCl. Does that mean I can still apply the same potentials with a silver reference without chlorinating it and get comparable results?
Hello George Tsekenis ,
I would suggest to take a look at these 2 RG discussions :
https://www.researchgate.net/post/How_can_I_fabricate_a_Ag_AgCl_reference_electrode
https://www.researchgate.net/post/Can_anyone_suggest_simple_methods_for_preparation_of_reference_electrodes10
There is several ways to make Ag/AgCl reference electrodes but you could simply try to run an electrolysis in HCl 0.1 M. You should then observe a black deposit on the silver. (All the details are here: https://m.tau.ac.il/~advanal/ReferenceElectrode.htm
Article Easy-to-Make Ag/AgCl Reference Electrode
Best regards,
Marie B.
Please look at the following below links which may help you in your analysis:
https://pdfs.semanticscholar.org/f2de/45adc518c1a918374894931f8462ad5842a8.pdf
https://pureapps2.hw.ac.uk/ws/portalfiles/portal/14152693/Obaje_et_al_2016_Journal_of_Interdisciplinary_Nanomedicine.pdf
Thanks
Dear George Tsekenis ,
Simple method of Ag/AgCl preparation is dip Ag portion in 0.1 M HCl and apply current of 10 mA/cm-2 for a duration of one minute. Use Pt as cathode. This may work. A black color deposition is the indication of the formation of AgCl on Ag.
you can paint on the Ag/AgCl - https://www.zimmerpeacocktech.com/products/liquid-solutions/biosensor-inks-and-pastes/
Hello!
Can anyone tell me about the color of silver chloride deposited on the electrode? In various sources, I met references to the fact that the color of the precipitate can be white, gray (from light to dark shade), purple, and even black. Silver chloride (white, as we know it in crystalline form) can be black?
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