We are using Ag/AgCl electrode for studying supercapcitors of polyaniline based working electrode. The working voltage range is 0 to 1 V. During the storage of reference electrode, it is observed that the tip becomes blue
During the experiments, solution containing aniline monomer penetrates into the tip, and during storage dissolved oxygen oxidizes monomer to polyaniline oligomers in the base form of emeraldine which has a blue color.
Thank you Prof. Grgur. But we are not synthesizing polyaniline electrochemically. Polyaniline was synthesized chemically and it was used to coat electrodes. Blue color is not coming during the expeiment. It comes during storage in KCl solution. In the electrochemical experiments we used 1 M H2SO4 as electrolyte. Can you please suggest how to clean the tip of electrode.
In that case, during the polarization of the PANI electrode above ~0.5 V, form soluble degradation products of the PANI and probably some degradation product penetrates into the tip which is further oxidized to PANI-oligomeric species with blue color. Depending on the molecular weight of PANI-oligomeric species you can first try methanol, then chloroform (low molecular weight species), and if it does not work use N-methyl-2-pyrrolidone.
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