Abstract
Tungsten-oxide nanourchins (NUs) consisting of nanowires added to a spherical shell were prepared by using the hydrothermal synthesis method. The detailed morphology and crystallinity depended on the synthesis time and the synthesis temperature. The electrochemical (EC) properties of an EC double layer capacitor using tungsten-oxide NUs/PEDOT:PSS composite films and a 1-M H3PO4 electrolyte were examined. The capacitance of tungsten-oxide NUs with relatively longer nanowires was 50% higher than that with shorter nanowires. Controlling the morphologing of nanostructures is important for improving the performance of a supercapacitor.
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