I have a Ag/AgCl electrode with KCl solution within it. But it shows some deposition on frit region when working in organic solvent. So what are the possible solution to the problem? Can double junction reference electrode help?
You can also replace KCl solution of your reference electrode with that of 2M LiCl in EtOH or can use Pt as pseudo-reference electrode.
Re-7 Non Aqueous reference electrode (Ag/Ag+): The RE-7 electrolyte solution is (0.01M AgNO3, 0.1M Tetrabutyl ammonium perchlorate (TBAP) in acetonitrile).
http://www.als-japan.com/1389.html
may be Ag/Ag+ (0.01 M Ag ClO4 )is the best way to get a non-aqueous reference. Works fine in acetonitrile but is useful in many polar solvents as well.
We recently got good results with an oxidized tungsten wire. Simply heat one end to ~1000°C for a few seconds in the flame and that's it.You can clean it and remake it several times.
It is not that stable but can be calibrated vs. ferrocene which is known in almost ll solvents.
Stephan Landgraf,
could you name, please, some test cases for your W-wires and give an indicative value(s) ?
You can try : { Pt, ox/redox (for example: quinone/hydroquinonet), tetrabutylammonium picrate in organic solvent | tetrabutylammonium picrate in organic solvent | } - double junction reference electrode
in this case: t (pic⁻) = t (tba+)
Please see the above document:
Overview of Reference Electrodes and Alternative Reference Electrodes: Brief Discussion about Standard and Pseudo Reference Electrodes.
What about KCl 3 mol/L as a reference electrolyte and LiCl 2 mol/L in Ethanol as a bridge electrolyte for Ag/AgCl double junction electrode ? Any ideas ...
The WOx reference electrode has a typical potential of -150 to -200 mV versus ferrocene (+200 to 250 mV vs. NHE). We first measure the sample as a series of several scan rates and then add solid ferrocene (~2 mM) and repeat.
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