用于超级电容器应用的聚丙烯腈/聚乙烯醇基多孔碳纳米纤维电极,International Journal of Energy Research

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用于超级电容器应用的聚丙烯腈/聚乙烯醇基多孔碳纳米纤维电极
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-05-27 , DOI: 10.1002/er.6896
Yasin Altin ₁ , Ayse Celik Bedeloglu ₁

Affiliation

多孔碳纳米纤维 (PCNF) 由聚丙烯腈 (PAN)/聚乙烯醇 (PVA) 混合纳米纤维制成，具有不同的混合比，用作超级电容器的独立、柔性、高性能电极。通过傅里叶变换红外 (FT-IR)、场发射扫描电子显微镜 (FE) 研究了 PAN/PVA 比例、PVA 去除和稳定/碳化过程对化学结构的影响以及 PAN/PVA 混合纳米纤维和 PCNF 的形貌-SEM) 和热重分析仪 (TGA)。FT-IR 和 FE-SEM 分析证明 PAN/PVA 混合纳米纤维已成功制备和碳化。此外，PCNF电极的电化学性能通过循环伏安法（CV）、恒电流充放电（GCD）、和电化学阻抗谱 (EIS) 方法。结果表明，与纯碳纳米纤维 (N-CNF) 相比，PCNF 具有更高的比电容和更好的电化学性能。EK5 PCNF 的比电容（67/33 PAN/PVA 重量比）在 1 MH 中以 5 mV/s 扫描速率为 157 F/g₂ SO ₄，而在相同条件下N-CNF的比电容为96 F/g。此外，PCNF 在 2 A/g 的电流密度下通过 2500 次充电/放电循环显示出优异的循环稳定性而不会损失性能。因此，独立、灵活和高性能的 PCNF 是用作柔性储能设备超级电容器电极的绝佳候选者。

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Polyacrylonitrile/polyvinyl alcohol-based porous carbon nanofiber electrodes for supercapacitor applications

Porous carbon nanofibers (PCNFs) were produced from polyacrylonitrile (PAN)/polyvinyl alcohol (PVA) hybrid nanofibers with different mixing ratios and used as the free-standing, flexible, high performance electrodes for the supercapacitors. The effect of PAN/PVA ratio, PVA removing and stabilization/carbonization process on the chemical structure, and the morphology of PAN/PVA hybrid nanofibers and PCNF were investigated by Fourier transform infrared (FT-IR), field emission scanning electron microscopy (FE-SEM), and thermogravimetric analyzer (TGA). It was proved by FT-IR and FE-SEM analyses that PAN/PVA hybrid nanofibers are successfully produced and carbonized. In addition, the electrochemical performance of PCNF electrodes was analyzed by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) methods. Results showed that PCNFs exhibit higher specific capacitance and better electrochemical performance than neat carbon nanofibers (N-CNF). The specific capacitance of the EK5 PCNF (67/33 PAN/PVA wt ratio) was 157 F/g at 5 mV/s scan rate in 1 M H₂SO₄, while the specific capacitance of N-CNF was 96 F/g at the same conditions. Moreover, the PCNF showed excellent cyclic stability without losing performance through 2500 charge/discharge cycles at a current density of 2 A/g. As a result, free-standing, flexible, and high-performance PCNFs are excellent candidates as supercapacitor electrodes for flexible energy-storage devices.

更新日期：2021-05-27

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