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Enhanced capacitance of rectangular-sectioned polypyrrole microtubes as the electrode material for supercapacitors

机译：矩形截面聚吡咯微管作为超级电容器电极材料的增强电容

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摘要

Rectangular-sectioned polypyrrole microtubes (R-PPy) were synthesized in aqueous solution with beta-cyclodextrin (beta-CD)/I-2 inclusion compound and FeCl3 by chemical oxidation. Field emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) were used to characterize the formation and molecular structure of R-PPy. From the results of the characterization, Complexes of beta-CD/I-2-Fe2+ acted as the soft-template during the synthesis process of rectangular-sectioned polypyrrole microtubes. Some I- ions retained in the backbone of the as-prepared PPy served as the counter ions after rinsing. Furthermore, R-PPy demonstrated higher conductivity and better electrochemical properties than PPy particles synthesized by the conventional method (C-PPy). The specific capacitance of R-PPy (322.5 F g(-1) at the current of 1 A g(-1)) is almost twice as large as that of C-PPy. The original specific capacitance of R-PPy can be maintained at around 83.3% whereas it was only about 61.5% for the C-PPy after 2000 charge-discharge cycles. The larger specific capacitance and relatively high cycling stability of R-PPy make it a more attractive candidate for energy storage electrodes than C-PPy.
机译：在水溶液中通过化学氧化法合成了带有β-环糊精（β-CD）/ I-2包合物和FeCl3的矩形截面聚吡咯微管（R-PPy）。利用场发射扫描电子显微镜（SEM），傅立叶变换红外光谱（FT-IR）和X射线衍射（XRD）来表征R-PPy的形成和分子结构。从表征结果来看，在矩形截面的聚吡咯微管的合成过程中，β-CD/ I-2-Fe2 +的配合物充当了软模板。冲洗后保留在制备好的PPy骨架中的一些离子用作抗衡离子。此外，与通过常规方法（C-PPy）合成的PPy颗粒相比，R-PPy具有更高的电导率和更好的电化学性能。 R-PPy的比电容（电流为1 A g（-1）时为322.5 F g（-1））几乎是C-PPy的两倍。 R-PPy的原始比电容可以保持在83.3％左右，而C-PPy在2000次充放电循环后仅为61.5％。 R-PPy的较大的比电容和相对较高的循环稳定性使其比C-PPy更适合储能电极。

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