Abstract
Composite nanostructures of tungsten oxide and polyaniline (PANI) were fabricated on carbon electrode by electrocodeposition using sodium dodecylbenzene sulfonate (SDBS) as the template. The morphology of the composite can be controlled by changing SDBS surfactant and aniline monomer concentrations in solution. With increasing concentration of aniline in surfactant solution, the morphological change from nanoparticles to nanofibers was observed. The nanostructured WO3/PANI composite exhibited enhanced capacitive charge storage with the specific capacitance of 201 F g−1at 1.28 mA cm−2in large potential window of-0.5~ 0.65 V versus SCE compared to the bulk composite film. The capacitance retained about 78% when the sweeping potential rate increased from 10 to 150 mV/s.
Highlights
Electrochemical capacitors have been considered as green energy storage devices which offer a number of desirable features such as fast charging/discharging within seconds and long cycle life
We present a simple and convenient method to fabricate PANI and tungsten oxide nanostructured composites on carbon electrode by electrocodeposition with sodium dodecylbenzene sulfonate (SDBS) surfactant as the template
Electrocodeposition of WO3 and PANI was conducted through 25 cyclic voltammetric scans between −0.6 and 0.9 V at 50 mV/s in solutions containing various concentrations of SDBS surfactant
Summary
Electrochemical capacitors (supercapacitors) have been considered as green energy storage devices which offer a number of desirable features such as fast charging/discharging within seconds and long cycle life. The challenge for the electrochemical capacitors is to promote the energy storage capability, maintaining its high charging/discharging rate. Conducting polymer with nanosphere structures was Journal of Nanomaterials reported to be obtained through an electrochemical synthesis from a surfactant containing solution [9]. Hu and coworkers embedded SnO2 nanoparticles in the PANI networks by in situ polymerization on surfaces of inorganic metal oxide nanoparticles; these nanocomposites showed high rate capability and cyclic stability for supercapacitor [14]. A model supercapacitor assembled by the obtained WO3/PANI composite as the negative electrode material displayed a significantly promoted energy density and improved cyclic stability. We present a simple and convenient method to fabricate PANI and tungsten oxide nanostructured composites on carbon electrode by electrocodeposition with sodium dodecylbenzene sulfonate (SDBS) surfactant as the template. Morphologies of the composites were investigated by scanning electron microscopy (SEM), while cyclic voltammetry and chronopotentiometry (CP) were carried out to study capacitive properties of the composites
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