Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28758
Title: Study on horn-shaped polypyrrole prepared by pulse potential
Authors: Wang, J
Tao, X 
Li, L 
Keywords: Electrochemical supercapacitors
Horn-shaped
Polypyrrole
Pulse current
Pulse potential
Issue Date: 2014
Publisher: Elsevier Ltd
Source: Synthetic metals, 2014, v. 194, p. 176-181 How to cite?
Journal: Synthetic Metals 
Abstract: Polypyrrole (PPy) films were prepared by direct current (DC), pulse current (PC) and pulse potential (PP) in aqueous solutions. The scanning electron microscope (SEM) images of PPy films indicated that a lot of horn-shaped PPy was formed during PP-PPy polymerization process. The top-end of horn-shaped PPy exhibits both open and closed structures. The body of horn-shaped PPy has a hollow structure with a thin wall. The micelles composed by PPy monomer and p-toluenesulfonate anions (PTS-) was formed when pyrrole monomer was dispersed in aqueous solution containing PTS- anions by mechanical stirring. In PP polymerization, the micelles with negative charge were repelled and hence left the surface of PPy films at switch off time. As a result, the PTS- anions on the surface of micelles were effectively supplied, and thus stabilized the micelles. This process results in the continuous growth of horn-shaped PPy. The hollow horn-shaped PPy films showed big specific capacitance, high charging/discharging rate and better stability.
URI: http://hdl.handle.net/10397/28758
ISSN: 0379-6779
DOI: 10.1016/j.synthmet.2014.04.026
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