One-Step Electrodeposition of Multilayered Surfactant/MnO 2 Composite and Its Electrochemistry

One-Step Electrodeposition of Multilayered Surfactant/MnO 2 Composite and Its Electrochemistry

Multilayered manganese dioxide film intercalated with surfactant molecules was synthesized by anodic oxidation of aqueous Mn(II) ions in the presence of cetyltrimethylammonium (CTA) ions. Ion-exchange and electrochemical properties of the CTA/MnO 2 nanocomposite were examined in different electrolyt...

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Veröffentlicht in:ECS transactions 2013-04, Vol.50 (36), p.35-44
Hauptverfasser: Shamoto, Mitsuhiro, Mito, Shunsuke, Tomono, Kazuaki, Nakayama, Masaharu
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Mito, Shunsuke
Tomono, Kazuaki
Nakayama, Masaharu
description Multilayered manganese dioxide film intercalated with surfactant molecules was synthesized by anodic oxidation of aqueous Mn(II) ions in the presence of cetyltrimethylammonium (CTA) ions. Ion-exchange and electrochemical properties of the CTA/MnO 2 nanocomposite were examined in different electrolytes (Na 2 SO 4 , sodium dodecylsulfate (NaDS), sodium benzenesulfonate (NaBS), and dodecyltrimethylammonium chloride. CTA + cations that were incorporated between MnO 2 layers during electrodeposition were not ion-exchanged with Na + in solution, probably as a result of hydrophobic interaction between their long alkyl chains. According to XPS analysis, cationic head groups of the surfactants were coupled with not only negative charges on MnO 2 layers but also Cl - anions. These Cl - anions were readily replaced with SO 4 2- and BS - , which means installation of anion exchange sites in the interlayer. Only in NaBS electrolyte, the CTA/MnO 2 film provided a good electrochemical response without releasing the CTA + ions, where the electroneutrality of the film was maintained by Na + ions.
doi_str_mv 10.1149/05036.0035ecst
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title One-Step Electrodeposition of Multilayered Surfactant/MnO 2 Composite and Its Electrochemistry
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