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.2006.01.002

Cited by 44 publications

(35 citation statements)

References 41 publications

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“…Electrochemically prepared PPy-WO 4 2- (Sabouri et al, 2009), PPy/PANI (Panah & Danaee, 2010) and Pt/PPy (Rahman, 2011) composite films provided noticeable corrosion inhibition for carbon steel, whereas PPy-TiO 2 (Lenz et al, 2003) (Kowalski et al, 2008), and PPy-PANAP (poly(5-amino-1-naphthol)) (Bereket & Hur, 2009) provided better protection for corrosion of mild steel. PPy-based coatings were also found to reduce the corrosion of oxidizable metals such as Fe (Bazzaoui et al, 2006;Bazzaoui et al, 2005;Lee et al, 2005), Al (Bazzaoui et al, 2005;Lehr & Saidman, 2006a;2006b)and Al alloys (Lehr & Saidman, 2006a;2006b). The efficiency of corrosion protection of PPy depends on the nature of the doping agents (Balaskas et al, 2011).…”

Section: Corrosion Protection Coatingsmentioning

confidence: 99%

Polypyrrole Composites: Electrochemical Synthesis, Characterizations and Applications

Singh¹,

Madhu²,

Awasthi³

2011

Electropolymerization

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Section: Corrosion Protection Coatingsmentioning

confidence: 99%

Polypyrrole Composites: Electrochemical Synthesis, Characterizations and Applications

Singh¹,

Madhu²,

Awasthi³

2011

Electropolymerization

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“…Electroactivity of an electrode can be also determined using chronopotentiometric methods. 26 Based on this method, Bazzaoui et al 26 successfully investigated the behavior of iron in sodium saccharinate aqueous solution. Generally two processes were noticed after immersion of Fe in 0.1 M sodium saccharinate aqueous solution and applying current density of 0.5, 1, 3 and 5 mA cm −2 .…”

Section: E308mentioning

confidence: 99%

“…Overoxidation of the polymer leads to irreversible loss of its electroactivity, 26,27,28 as oxidation at positive potentials interrupts conjugation by formation of hydroxyl and carbonyl species.…”

mentioning

confidence: 99%

“…17 It has also been reported that PPy films can be overoxidized when subjected to positive potentials for a long time, or higher potentials for a shorter times. Overoxidation of the polymer leads to irreversible loss of its electroactivity, 26,27,28 as oxidation at positive potentials interrupts conjugation by formation of hydroxyl and carbonyl species. 29 Except for checking the electrochemical behavior of a polymer film, it is also important to characterize the behavior of a bare electrode substrate.…”

mentioning

confidence: 99%

“…29 Except for checking the electrochemical behavior of a polymer film, it is also important to characterize the behavior of a bare electrode substrate. Electrochemical behavior of Fe in various kinds of solutions such as malic acid, 22 sodium tartrate, 30 sodium salicylate, 31 or sodium saccharinate 32,26 has been investigated by many groups. Besides iron, also other metals such as platinum, 22,31 zinc and aluminum, 31 have been studied.…”

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Electrochemical Activity and Electrical Properties of Optimized Polypyrrole Coatings on Iron

Cysewska

Virtanen

Jasiński

2015

J. Electrochem. Soc.

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In this work, electrochemical activity and electrical properties of polypyrrole (PPy) coated iron electrodes have been investigated. PPy film was electrochemically polymerized from sodium salicylate aqueous solution under conditions, which provided an increase of iron corrosion resistance. It was noticed that the pH of the solution and the applied electrode potential range during the study of the polymer properties had an influence on the observed electroactivity of PPy. The electroactivity of PPy was retained in neutral solution when the potential was scanned between −0.6 and 0.3 V. Also the resistance behavior of the synthesized polymer film as a function of the electrode potential during doping/dedoping processes was studied. Determination of the resistance was based on the impedance spectroscopy measurements and was performed in air, in order to avoid the influence of the solution resistance on the resistance of the studied polymer. Depending on the redox properties, the pH of solution and the potential range, different resistances of the polymer film during the doping/dedoping process can be obtained. In recent years, there is increasing interest to create a biodegradable, metallic, cardiovascular stent as an alternative for its permanent form.1,2 Iron and its alloys are promising materials for this application and have attracted attention of many researchers.2,3-6 Iron shows a good mechanical behavior, possesses favorable biological properties and a good biocompatibility. However, the degradation rate and the biological performance need to be controlled and optimized.1,2 One possible way to optimize the performance, is coating the metal with conducting polymers. 5,7 To support non-toxicity of such an implant, drug molecules can be incorporated in the polymer film, which could be released from the polymer during the implant degradation, and hence possible inflammation reactions would be decreased.One of the most interesting candidates among conducting polymers is polypyrrole (PPy).8-10 Because of its high biocompatibility, 11 good environmental stability, 8 higher conductivity compared to many other conducting polymers, 8 PPy can be used in various applications including anti-corrosive coatings 7 and controlled drug release systems. 12PPy like other conducting polymers exhibits redox switching ability between its reduced and oxidized states. 13 During the synthesis, a positively charged PPy backbone is formed and the polymer becomes oxidized. This is accompanied by the incorporation of the counter-anions into the polymer structure in order to achieve charge neutrality. [14][15][16] After the synthesis, the polymer can be re-oxidized (doped) or reduced (dedoped) in order to change some of its properties. However, depending on the doping/dedoping electrolyte, charge neutrality will be maintained by the movement of anions, cations, or both into and out of the polymer film.15 Polypyrrole behavior depends strongly on its oxidation state. Reduced PPy films behave as electronic insulators, however oxidation of the...

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Electroactive Conducting Polymers for the Protection of Metals against Corrosion: from Micro‐ to Nanostructured Films

Lacaze

Ghilane

Randriamahazaka

et al. 2010

Nanostructured Conductive Polymers

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Sweet aqueous solution for electrochemical synthesis of polypyrrole

Cited by 44 publications

References 41 publications

Polypyrrole Composites: Electrochemical Synthesis, Characterizations and Applications

Polypyrrole Composites: Electrochemical Synthesis, Characterizations and Applications

Electrochemical Activity and Electrical Properties of Optimized Polypyrrole Coatings on Iron

Electroactive Conducting Polymers for the Protection of Metals against Corrosion: from Micro‐ to Nanostructured Films

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