Highly stable polypyrrole film prepared by unipolar pulse electro-polymerization method as electrode for electrochemical supercapacitor

Supercapacitors specialities - Materials review

“…On the other hand for a polypyrrole film deposited on platinum substrate [96], the specific capacitance has reached 406 F/g at a scan rate of 5 mV/s in 1 M KCl electrolyte and three electrode system. A value of 586 F/g was reported in [97] for polypyrrole multilayer nanosheets at 2 mV/s in 0.5 M H 2 SO 4 . The surface area was of 37.1 m 2 /g.…”

Galvanostatic deposition of polypyrrole in the presence of tartaric acid for electrochemical supercapacitor

“…The electrode surface was stabilized by an iron tartrate layer [9], which decreased the dissolution of SS, and enabled the formation of polymer with longer conjugated chains. Reports in the literature show that longer conjugation length of PPy on Pt, Ni and glassy carbon surfaces exhibited a higher electrical conductivity that may be the reason for the increase in specific capacitance of PPy [35][36][37]. Senthilkumar et all.…”

Electrophoretic deposition of polypyrrole/Vulcan XC-72 corrosion protection coatings on SS-304 bipolar plates by asymmetric alternating current for PEM fuel cells

“…Because T1 is achieved under alternating positive and negative currents, the monomer transported to the electrode surface is subjected to oxidationereduction processes that give as a result a more homogeneous PPy coating. During t off in the AAC deposition, fresh reactants are replenished on the surface of the electrode, reducing the corrosion rate of the T1 sample [21]. On the other hand, there is no significant shift in the onset of the three electrodes in Fig.…”

“…1(a and b). During t off , the nucleation of PPy and the transport of Vulcan particles is halted, and then continue in the following voltage-on step on new surface sites [21,23]. As a comparison, the growth of PPy and transport of Vulcan particles on T1-CDC ( Fig.…”

“…The presence of two bands at 2923 and 2854 cm À1 is a characteristic of the asymmetric and symmetric stretch vibrations of aliphatic CH 2 . The relatively high potentials at which the coating has been formed can promote the formation of such bivalent functional groups, producing more non conducting oligomers on the electrode surface [21,25]. As can be seen, these two bands are stronger for T9-PPC and T9-CDC, as a result of the potential cycle being applied (see Fig.…”