We prapare Ni deposited polypyrrol (PPy). But after Ni deposition, the conductive polymer is depoded and in CV analysis, the observed current value is very low. An advice is expected from the experts, how could we redope the PPy? It is mention that, we prepared PPy with FeCl3 salt.
Dear Kawsar, while it is not clear from the description how you deposited Ni over PPy (chemically or electrochemically), it suggests that you reduced it from the salt in the same medium which contained doped PPy. during this procedure PPy was also undergone the reduction and, therefore, became dedoped. So, you need to re-oxidize PPy by e.g. FeCl3 or other weak oxidant or electrochemically (at the potential of PPy oxidation )
Thank you @ Alexnder for your suggestion. But when we use FeCl3 for redoped of PPy, reduced Ni metal is also oxidised as Chloride salt and removed from composite surface. We also tried with other oxident but the result was very poor to consider. Finally, we used chemical method for the deposition of Ni metal on PPy surfaces.
Dear Kawsar Hossain, based on electrochemical activity of the metals I think that the Ni coating damage by FeCl3 due to the oxidation is not the main process but can run due to hydrolysis of this salt and, therefore, appearance of acidic pH of its water solution. The acid (HCl here) can dissolve the Ni stuff in your case. So, if you still need it, you can try to treat the Ni coated PPy by anhydrous FeCl3 in a suitable anhydrous solvent (you have to try a few differing by nature ones to find the best e.g. acetonitrile, chloroform, propanol, etc.). The target process can be facilitated in anhydrous medium while Ni oxidation can be suppressed. But, however, it depends).
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