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Composite films of polyaniline and molybdenum oxide formed by electrocodeposition in aqueous media

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Abstract

Composite films of polyaniline (PANI) and molybdenum oxide (MoOx) were afforded through a convenient route of electrocodeposition from aniline and (NH4)6Mo7O24. The composite films showed characteristic redox behaviors of PANI and MoOx, respectively, on the cyclic voltammograms. Chlorate and bromate were catalytically electroreduced with an enlarged current on the composite film at a potential ca. 0.2 V more positive than that on MoOx. The potential window for the composite film to display pseudocapacitive properties in 1.0 mol·dm−3 NaNO3 was −0.6 ∼ 0.6 V vs SCE. The cathodic potential limit shifted at least 0.4 V negatively from that of polyaniline (PANI)-based materials reported so far. The specific capacitance was 363.6 F·g−1 when the composite film was charged–discharged at 1.5 mA·cm−2, about two times of that of the similarly prepared PANI. The composite film was characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Molybdenum existed in a mixed state of +5 and +6 in the composite film based on XRD and XPS investigations.

PANI and (MoOx) were electrocodeposited in aqueous solutions from aniline and (NH4)6Mo7O24. The composite film obtained displayed catalytic activities toward the electroreduction of oxoanions. The pseudocapacitance of the composite film is nearly two times of that of PANI with the potential window extended negatively up to −0.6 V vs SCE

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Acknowledgment

We gratefully acknowledge the financial support from the National Natural Science Foundation of China (project number 50372011), Natural Science Foundation of Liaoning Province, China (project number 20052016), Open Project of Key Laboratory for Supramolecular Structure and Materials (project number KLSSM-200604), and Educational Ministry of China (project number NEU200623).

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  1. Department of Chemistry, Northeastern University, Shenyang, 110004, People’s Republic of China

    Xiao-Xia Liu, Li-Jun Bian, Lu Zhang & Li-Jun Zhang

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  1. Xiao-Xia Liu
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  2. Li-Jun Bian
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  3. Lu Zhang
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Correspondence to Xiao-Xia Liu.

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Liu, XX., Bian, LJ., Zhang, L. et al. Composite films of polyaniline and molybdenum oxide formed by electrocodeposition in aqueous media. J Solid State Electrochem 11, 1279–1286 (2007). https://doi.org/10.1007/s10008-007-0287-3

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  • DOI: https://doi.org/10.1007/s10008-007-0287-3

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