Palladized aluminum as a novel substrate for electrosynthesis of polyaniline in sulfuric acid solutions

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• 作者：M. H. Pournaghi-Azar and Biuck A. Habibi
• 关键词：Conductive polymer ; Electropolymerization ; Polyaniline ; Palladized aluminum electrode ; Electrocatalysis
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2007
• 出版时间：April, 2007
• 年：2007
• 卷：11
• 期：4
• 页码：505-513
• 全文大小：497 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768

文摘

The electropolymerization of aniline on a palladized aluminum electrode (Pd/Al) by potentiodynamic as well as potentiostatic methods is described. The effect of the monomer concentration between 0.01 and 0.4 M on the polyaniline (PANI) formation and its growth on the Pd/Al electrode was investigated and a suitable concentration of 0.2 M is suggested. A similar study was carried out to investigate the effect of sulfuric acid concentration and 0.1 M sulfuric acid was chosen. A study on the influence of electropalladization time on the polymer formation and its growth suggested a convenient time of 40 s. The stability of the PANI film on the Pd/Al electrode was studied as function of the potential imposed on the electrode. For applied electrode potentials of 0.1–0.7 V, the first-order degradation rate constant, k, of PANI film varies between 1×10?6 and 2×10?5 s?1, and a relatively low slope (i.e., 2.2) was obtained for the plot of log k versus E. The coatings were characterized by scanning electron microscopy (SEM), and cyclic voltammetric behavior of the PANI-deposited Pd/Al electrode is discussed. The electrocatalytic activity of the PANI-deposited Pd/Al electrode against para-benzoquinone/hydroquinone (Q/H₂Q) and \textFe( \textCN )3 - ₆ \mathord/ \vphantom \textFe( \textCN )3 - ₆ \textFe( \textCN )4 - ₆ \textFe( \textCN )4 - ₆ {{\text{Fe}}{\left( {{\text{CN}}} \right)}^{{3 - }}_{6} } \mathord{\left/ {\vphantom {{{\text{Fe}}{\left( {{\text{CN}}} \right)}^{{3 - }}_{6} } {{\text{Fe}}{\left( {{\text{CN}}} \right)}^{{4 - }}_{6} }}} \right. \kern-\nulldelimiterspace} {{\text{Fe}}{\left( {{\text{CN}}} \right)}^{{4 - }}_{6} } redox systems were investigated and on the basis of DE_p = Ea_p - Ec_p\Delta E_{p} = E^{a}_{p} - E^{c}_{p} of the corresponding cyclic voltammograms and the redox systems were identified as the reversible and quasi-reversible systems, respectively.