Diffusion-limited characteristics of mechanically induced currents in polypyrrole/Au-membrane composites
Diffusion-limited characteristics of mechanically induced currents in polypyrrole/Au-membrane composites
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DOI：
10.1016/j.electacta.2011.02.089
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发表时间：
2011-04
影响因子：
6.6
通讯作者：
W. Takashima;Shunsuke Kawamura;K. Kaneto
中科院分区：
文献类型：
--
作者：
W. Takashima;Shunsuke Kawamura;K. Kaneto
研究了不同表面形貌的聚吡咯/镀金复合膜(PPy/Au膜)中的机械感应电流(MIC)，并在电化学池中确定了电解液条件。在含有一层PPy的多孔PPy/Au膜上产生了MIC。相反，在非高孔性薄膜中观察到相对较小的MIC，例如独立薄膜和具有较厚PPy沉积的PPy/Au膜。在不含PPy的Au膜中也观察到MIC小一个数量级。这些结果表明，MICs是由于氧化还原电容和双层电容中的充电现象造成的。MIC随支持电解质及其浓度的不同而不同。在含有稀溶液和大体积阳离子的溶液中，MIC显著降低，表明可移动离子的数量和渗透速度限制了MIC的大小。这些特性表明MIC本质上是一种扩散限制电流。还配置了一个双电极MIC电池来研究生理盐水溶液中的发电膜，这可能会被用于生物医学应用。
A mechanically induced current (MIC) in a polypyrrole/Au-coated membrane (PPy/Au-membrane) composite with various surface morphologies was investigated, and the electrolyte conditions were determined in an electrochemical cell. A MIC was induced on porous PPy/Au-membranes with a thin layer of PPy. Conversely, relatively small MICs were observed in non-highly porous films such as freestanding films and PPy/Au-membranes with thick PPy deposits. A MIC smaller by one order of magnitude was also observed in a Au-membrane without PPy. These results indicated that the MICs was due to a charging phenomenon in both the redox and the double layer capacitances. The MIC also varied with supporting electrolyte and their concentration. The MIC was strongly reduced in solutions with diluted electrolytes and with bulky cationic electrolytes, indicating that the number and the penetration speed of mobile ions limited the magnitude of the MIC. These characteristics indicated that the MIC was essentially a diffusion limited current. A two-electrode MIC cell was also configured to investigate a power generation film in a normal saline solution, which can possibly be utilized for biomedical applications.