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首页> 外文期刊>RSC Advances >Electrospun polyacrylonitrile/β-cyclodextrin based porous carbon nanofiber self-supporting electrode for capacitive deionization
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Electrospun polyacrylonitrile/β-cyclodextrin based porous carbon nanofiber self-supporting electrode for capacitive deionization

机译：静电纺聚丙烯腈/β-环糊精基多孔碳纳米纤维自支撑电极

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摘要

With β-cyclodextrin (β-CD) as an additive, porous carbon nanofibers (PCNFβ-CD) with good graphitization have been fabricated by electrospinning polyacrylonitrile/β-cyclodextrin (PAN/β-CD) pristine fibers followed by preoxidation and carbonization. The nanopores were formed by the dehydration and decomposition of β-CD at high temperature. The specific surface area and pore density can be conveniently tuned by adding different amounts of β-CD in the precursor solution. The resultant porous carbon fibers were characterized by scanning electron microscopy, N2 adsorption/desorption analysis and fourier transform infrared spectroscopy. Raman analysis indicates that the graphitic network of the porous carbon is improved with the addition of β-CD. With the porous carbon fiber web as a self-standing electrode, the electrochemical properties of the electrodes were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. PCNFβ-CD were employed as active electrodes for capacitive deionization (CDI). The optimal desalination amount of 11.65 mg g?1 was achieved on the PCNFβ-CD fabricated with the PAN/β-CD ratio of 1?:?0.8, which is significantly higher than that of pure PAN-based carbon nanofibers. Multiple charge–discharge cycling of the CDI cell was tested and the regeneration of the electrode was demonstrated.
机译：以β-环糊精（β-CD）为添加剂，通过电纺聚丙烯腈/β-环糊精制备了石墨化良好的多孔碳纳米纤维（PCNF β-CD ）（ PAN /β-CD）原始纤维，然后进行预氧化和碳化。纳米孔是由β-CD在高温下脱水和分解而形成的。通过在前体溶液中添加不同量的β-CD，可以方便地调整比表面积和孔密度。通过扫描电子显微镜，N 2 吸附/解吸分析和傅里叶变换红外光谱对所得多孔碳纤维进行表征。拉曼分析表明，通过添加β-CD可以改善多孔碳的石墨网络。以多孔碳纤维网为自立式电极，通过循环伏安法和电化学阻抗谱研究了电极的电化学性能。 PCNF β-CD 被用作电容去离子（CDI）的有源电极。用PAN制备的PCNF β-CD 的最佳脱盐量为11.65 mg g ？1 /β-CD比为1？：？0.8，大大高于纯PAN基碳纳米纤维。测试了CDI电池的多次充放电循环，并演示了电极的再生。

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