Kinetics and efficiency of aqueous electropolymerization of pyrrole onto low‐carbon steel

Su, Weiji; Iroh, Jude O.

doi:10.1002/(sici)1097-4628(19970718)65:3<617::aid-app22>3.3.co;2-t

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 Adherent PPY coatings were formed on low carbon steels using oxalic acid as an electrolyte. 11,12 It was shown that steels interacted with oxalic acid to form passive layers, which prevented corrosion of the substrates.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of composite polypyrrole–carbon nanotube films

Shi

Zhitomirsky

2011

Surface Engineering

View full text Add to dashboard Cite

Polypyrrole (PPY) films were electrochemically deposited on stainless steel substrates from aqueous pyrrole solutions containing p-toluene sulphonic acid and 4,5-dihydroxy-1,3-benzenedisulphonic acid disodium salt (tiron). The deposition potential of PPY in the solutions containing tiron was 0?2 V lower than that in the solutions containing p-toluene sulphonic acid. It was found that tiron can be used for the dispersion of multiwalled carbon nanotubes (MWCNTs) and fabrication of composite PPY-MWCNT films. The deposition yield was studied under galvanostatic conditions. The mechanism of PPY-MWCNTs deposition in the presence of tiron was discussed. The incorporation of MWCNTs into the PPY during electropolymerisation resulted in the formation of porous films. The films were investigated for the application in electrodes of electrochemical supercapacitors. Cyclic voltammetry data for the films tested in the 0?5M Na 2 SO 4 solutions showed a capacitive behaviour in a voltage window of 20?5 to z0?4 V versus a saturated calomel electrode. The composite PPY-MWCNT films showed improved capacitive behaviour and lower electrical resistance compared to the pure PPY films. A highest specific capacitance (SC) of 310 F g 21 was obtained at a scan rate of 2 mV s 21 for the composite films. The SC decreased with an increasing film thickness and scan rate. The cycling stability of the films was investigated. The results indicated that the PPY-MWCNT films deposited on the stainless steel substrates are promising electrode materials for electrochemical supercapacitors.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrodeposition of composite polypyrrole–carbon nanotube films

Shi

Zhitomirsky

2011

Surface Engineering

View full text Add to dashboard Cite

show abstract

“…Su and Iroh [31] and Nguyen Thi Le et al [11]. The electrochemical deposition of polypyrrole is initiated by the oxidation of pyrrole monomers.…”

Section: Polypyrrole Depositionmentioning

confidence: 99%

Electrochemical behaviour of poly(pyrrole) coatings on steel

2006

View full text Add to dashboard Cite

The electrochemical and corrosion protective properties of electrochemically deposited thin films of polypyrrole (PPy) have been studied. Two systems have been investigated: (1) Oxalate-doped PPy; and (2) a dual layer system consisting of PPy-oxalate and PPy-poly(styrene sulfonate). Large anions like PSS are interesting, because they possibly prevent ingress into the layer by halide ions like chloride. Open circuit potential measurements and impedance spectra of both systems are compared. For intact coating systems the impedance spectra of the four systems investigated can be described by an equivalent circuit model consisting of an R f Q f circuit, due to the polypyrrole film itself, and a modified Randles circuit in series, to account for the double layer at the polypyrrole/ electrolyte interface and the polypyrrole reaction. In 0.1 M NaCl the time to failure for the dual layer is almost 6-fold that of the single layer. This indicates that PSS is indeed capable of preventing the ingress of chloride ions. In 0.1 M Na 2 SO 4 the time to failure for the dual layer is less than double that of the single layer.

show abstract

“…It has been shown that only dibasic acids such as oxalic acid can passivate the steel surface while providing adequate adhesion of polypyrrole and polyaniline. Recently electrochemical polymerization processes have been developed for the formation of strongly adherent polypyrrole and polyaniline coatings from aqueous oxalic acid solution [5][6][7]. In addition, mechanisms of the electrodeposition process and interphase characterization have also been investigated [8,9].…”

Section: Introductionmentioning

confidence: 99%

EIS investigation of passive film formation on mild steel in oxalic acid solution

2007

View full text Add to dashboard Cite

The properties of oxide films on mild steel formed anodically in aqueous solution containing oxalic acid were investigated by means of electrochemical impedance spectroscopy (EIS). The morphology of the passive layers at different stages of film formation was investigated using scanning electron microscopy (SEM). Passivation of mild steel in oxalic acid solution is a multistage process that occurs before passive layer breakdown. The influence of potential on the electrochemical behavior of the passive layer was also investigated. Depending on the passive layer potential, the EIS spectra obtained exhibited a one-or two-time constant system. This suggests the formation of either a one layer or two layer oxide film on the mild steel surface, depending on the passivation potential.

show abstract

Kinetics and efficiency of aqueous electropolymerization of pyrrole onto low‐carbon steel

Cited by 3 publications

References 0 publications

Electrodeposition of composite polypyrrole–carbon nanotube films

Electrodeposition of composite polypyrrole–carbon nanotube films

Electrochemical behaviour of poly(pyrrole) coatings on steel

EIS investigation of passive film formation on mild steel in oxalic acid solution

Contact Info

Product

Resources

About