Electropolymerization of palladium tetraaminephthalocyanine: Characterization and supercapacitance behavior

• Synthesised polymeric palladium tetraamine phthalocyanine by electropolymerization from its tetraamine monomer.
• Each additional monomeric unit is added to the polymer on cycling in the potential range −0.5 to +1.0 V.
• The synthesized compound showed broader peaks in Raman spectrum indicating its polymeric nature.
• XPS spectra indicated that the polymerization takes place at the peripheral amine groups and not axial polymerization through metal.
• The polymer showed a capacitance of 146 Fg−1 at 0.27 V in 0.5 M H2SO4.

The formation of a supramolecular electropolymerized film of a polymeric palladium phthalocyanine on a glassy carbon electrode is reported here. The film was obtained by cycling monomeric palladium tetraaminephthalocyanine in dimethyl sulfoxide in the potential range −0.5 to +1.0 V. The functionalized polymerized film on the electrode was characterized using Raman spectroscopy, X-ray photoelectron spectroscopy and electrochemical methods. A polymeric phthalocyanine film was shown to form by the oxidation of peripheral amino groups. It uniformly and completely covered the electrode surface. The modified electrode surface slightly blocked the reversible redox behavior of a redox probe owing to the thick polymeric film on its surface. The modified electrode showed a redox capacitance of 146 F g−1 at 0.27 V in 0.5 M sulfuric acid.

Figure: Cyclic voltammograms of GCEs in 0.5 M H2SO4 at 5 mV/s in N2: i) pristine and ii) modified with poly(PdTAPc). The polymeric palladium tetraaminephthalocyanine has been prepared by electropolymerization. The polymer is characterized and showed very good supercapacitance behavior in 0.5 M H2SO4.Figure optionsDownload as PowerPoint slide