Controllable Assembly of Polyaniline Nanostructures and Improving Their Electrochemical Performance by High Gravity
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- 作者：Jiazang Chen ; Bo Li ; Jianfeng Zheng ; Jianghong Zhao ; Huanwang Jing ; Zhenping Zhu
- 刊名：Journal of Physical Chemistry C
- 出版年：2011
- 出版时间：November 24, 2011
- 年：2011
- 卷：115
- 期：46
- 页码：23198-23203
- 全文大小：842K
- 年卷期：v.115,no.46(November 24, 2011)
- ISSN：1932-7455
文摘
A novel strategy is proposed for controllable synthesis of polyaniline nanofibers by introducing high gravity into the interfacial polymerization system. During the polymerization of the aniline monomers, overgrowth and aggregation of the polyaniline nanofibers were effectively suppressed by virtue of high gravity. By adjustment of high gravity levels, polyaniline nanofibers with various diameters can be obtained, and the diameter of the nanofibers becomes smaller as the gravitational acceleration increases (from 9.8 m/s2 to 78.4 m/s2). By application of these materials as hole conductor media in quasi-solid-state dye-sensitized solar cells, it was found that the electrochemical behaviors are strongly dependent on the high gravity that is applied for the synthesis of the polyaniline nanofibers. Electrochemical impedance spectroscopy characterization indicates that both of the transport properties of charge in the bulk of the electrolyte and charge transfer on the counter electrode are affected by the diameter of the nanofibers. The quasi-solid-state photovoltaic devices employing the polyaniline nanofibers obtained under a high gravity level of 78.4 m/s2 achieved energy conversion efficiency of 1.375%, which is 76% higher than that obtained under normal gravitational acceleration on Earth (9.8 m/s2).