Sweet aqueous solution for electrochemical synthesis of polypyrrole

Bazzaoui, M.; Martins, Jorge; Costa, Sofia; Bazzaoui, E.A.; Reis, T.C.; Martins, La Salete

doi:10.1016/j.electacta.2005.07.020

Cited by 57 publications

(25 citation statements)

References 31 publications

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“…The results obtained in this work show that, unlikely some results presented in literature for the electrodeposition of PPy films on cupper or zinc surfaces from tartrate aqueous solution, 26,27 PPy films electrodeposited potentiodynamically on aluminum in neutral medium are not uniform.…”

Section: Influence Of Ph On the Electropolymerization Of Pyrrolementioning

confidence: 68%

“…It has been reported that this cauliflower structure is related to the dopant intercalation difficulty in the disordered polymeric chain. 26 PPy films formed at higher current densities (10 mA cm -2 ) present smaller cauliflowers size, with larger voids among them, than films formed at lower current density values (e.g., 2.5 mA cm -2 ). The same explanation given previously to justify the poor adherence of films formed at high current density can be used to explain the morphology differences between films formed at low and high currents densities.…”

Section: Morphology Of the Ppy Films Sem Micrographsmentioning

confidence: 99%

“…21 Although tartrate medium has been used to deposit PPy on other substrates, this medium has not been used to prepare PPy films on aluminum substrates. [26][27][28] This work presents the results of the electrodeposition of PPy on aluminum from aqueous media containing pyrrole and tartrate in different concentrations and different values of pH. Additionally, the efficiency of PPy films to protect aluminum surfaces against corrosion was also investigated.…”

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Liu¹,

Oliveira²

2007

J. Braz. Chem. Soc.

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A síntese eletroquímica de filmes de polipirrol em superfícies de alumínio, em meio aquoso contendo ácido tartárico e pirrol, foi realizada através da técnica galvanostática e por voltametria cíclica. Um mecanismo que considera o crescimento de uma camada porosa de óxido de alumínio em paralelo com a eletrodeposição do filme de polipirrol foi proposto. Foi observado que quanto mais homogênea a distribuição dos poros na camada de óxido, menor a resistência oferecida para o crescimento dos filmes de polipirrol. Também foi observado que os filmes de polipirrol depositados por voltametria cíclica são menos uniformes do que aqueles formados galvanostaticamente. Filmes eletrodepositados galvanostaticamente a maiores densidades de corrente são mais propensos ao processo de superoxidação, como mostram os resultados de FTIR. Além disso, filmes de polipirrol depositados a 2,5 mA cm -2 apresentam um melhor desempenho na proteção de superfícies de alumínio contra corrosão.The electrochemical synthesis of polypyrrole films on aluminum surfaces from aqueous solutions containing tartaric acid and pyrrole was performed using cyclic voltammetry and galvanostatic techniques. A mechanism that considers a porous aluminum oxide layer growing in parallel with the polymeric film explains the polypyrrole electrodeposition on aluminum surfaces. The more homogeneous the distribution of pores on the aluminum oxide layer, the smaller is the resistance offered to the polypyrrole film growth. Polypyrrole films deposited by cyclic voltammetry are much less uniform than those galvanostatically formed. Polymeric films galvanostatically deposited at higher current densities were more susceptible to overoxidation processes than those films formed at lower current densities, as demonstrated by FTIR analyses. Furthermore, films formed at low current density perform better on protecting aluminum surfaces against corrosion.

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Section: Influence Of Ph On the Electropolymerization Of Pyrrolementioning

confidence: 68%

Section: Morphology Of the Ppy Films Sem Micrographsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Liu¹,

Oliveira²

2007

J. Braz. Chem. Soc.

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“…The observed bands are characteristic of polypyrrole and were assigned according to literature reports. [29][30][31][32] The assignment of the bands reveals the N-H in-plane ring deformation at 1046 cm Ϫ1 , C-H out of plane deformations at 920 and 739 cm Ϫ1 and the C-C out of plane deformations at 966 cm Ϫ1 . The pyrrole ring stretches can be seen at 1165, 1463, and 1540 cm Ϫ1 .…”

Section: ϫ2mentioning

confidence: 99%

The Formation of Polypyrrole at Iron from 1-Butyl-3-methylimidazolium Hexafluorophosphate

Fenelon

Breslin

2005

J. Electrochem. Soc.

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The ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, was used to deposit adherent and highly conducting polypyrrole coatings at pure iron using a simple potentiostatic technique. Adherent and highly conducting polypyrrole films were formed at the iron substrate using potentials in the range from 1.0 to 1.4 V and with pyrrole concentrations between 0.1 and 0.3 mol dmϪ3 . An increase in the applied potential, or the concentration of the monomer, gave rise to an increase in the rate of polymer growth. The polypyrrole-coated iron electrodes were electroactive and remained highly conducting and stable in the ionic liquid. Using electrochemical impedance spectroscopy, the charge-transfer resistance of the uncoated iron electrode was determined as 1.25 ϫ 10 4 ⍀ cm 2 compared to the much lower resistance of 1.90 ϫ 10 2 ⍀ cm 2 measured for the highly conducting polypyrrolecoated electrode in the ionic liquid. The room temperature ionic liquid systems based on the N,NЈ-dialkyl-substituted imidazolium cations have attracted increasing attention and interest in recent years.1-4 This is not surprising in light of their promising physical and chemical properties, which include high ionic conductivity, negligible volatility, nonflammability, excellent thermal and chemical stability, air and moisture stability, and, in terms of electrochemistry, a wide potential window.Research into the formation, or properties, of conducting polymers in ionic liquids dates back to the mid 1980s, with the work of Osteryoung and co-workers.5-7 However, the chloroaluminate ionic liquids used in these investigations were moisture sensitive. In more recent times, it has been shown that conducting polymers can be electrosynthesized in the ambient temperature imidazolium-based ionic liquids with anions such as hexafluorophosphate or tetrafluoroborate. [8][9][10][11][12][13][14] But of more significance is the fact that the conducting polymers cycled in, or electropolymerized from, these imidazolium-based ionic liquids exhibit greatly enhanced electrochemical stability, negligible polymer degradation and fast switching speeds. [8][9][10][11][12][13][14] For example, Lu et al. 10 found that polyaniline, polypyrrole, and polythiophene showed negligible loss in electroactivity when cycled in room-temperature ionic liquids composed of 1-butyl-3-methyl imidazolium cations with either tetrafluoroborate or hexafluorophosphate anions. Sekiguchi et al.13,14 used 1-ethyl-3-methylimidazolium trifluoromethanesulfonate as an electrolyte for the electrochemical polymerization of pyrrole. The electrochemical capacity and conductivity of the polypyrrole were significantly increased when prepared from the ionic liquid. Other polymer systems that have been studied in these imidazolium-based ionic liquids include poly͑3,4-ethylenedioxythiophene͒ 15,16 and poly͑2-methoxy-5-͑2Ј-ethylhexyloxy͒-1,4-phenylene vinylene ͑MEH-PPV͒. 17These studies have all been conducted with inert electrodes. Although conducting polymers have been deposited at corrosion susceptib...

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“…However, some important results were meanwhile obtained by several researches in organic and aqueous media. [20][21][22][23][24][25][26][27][28][29] The PPy electrosynthesized on aluminium in aqueous medium is a bilayer-film composed by a barrier-type Al 2 O 3 and an electronically conducting PPy film. 22,28,29 ) migrate toward the aluminium electrode.…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole coating doped with dihydrogenophosphate ion to protect aluminium against corrosion in sodium chloride medium

Martins

Diblikova

Bazzaoui

et al. 2012

J. Braz. Chem. Soc.

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A electrodeposição do polipirrole (PPy) sobre alumínio em soluções de ácido fosfórico foi obtida através de técnicas potenciodinâmicas, potenciostáticas e galvanostáticas. O comportamento do alumínio revestido com polipirrole em meio de cloreto de sódio foi investigado através do potencial de circuito aberto e espectroscopia de impedância electroquímica. É proposto um mecanismo para explicar o efeito benéfico do íon dihidrogenofosfato na passivação do alumínio.The electrodeposition of polypyrrole (PPy) on aluminium electrodes has been achieved in phosphoric acid medium by using potentiodynamic, potentiostatic and galvanostatic techniques. The corrosion behavior of polypyrrole on aluminium in sodium chloride medium has been investigated by open circuit potential and electrochemical impedance spectroscopy. A mechanism to explain the beneficial effect of PPy-doping dihydrogenophosphate ion in the passivation of aluminium is proposed.

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Sweet aqueous solution for electrochemical synthesis of polypyrrole

Cited by 57 publications

References 31 publications

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

The Formation of Polypyrrole at Iron from 1-Butyl-3-methylimidazolium Hexafluorophosphate

Polypyrrole coating doped with dihydrogenophosphate ion to protect aluminium against corrosion in sodium chloride medium

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