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Freestanding supercapacitor electrode applications of carbon nanofibers based on polyacrylonitrile and polyhedral oligomeric silsesquioxane
Materials & Design ( IF 7.6 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.matdes.2017.10.071
Jing Yan , Jae-Hak Choi , Young Gyu Jeong

Abstract The microstructures and electrochemical performance of polyacrylonitrile/polyhedral oligomeric silsesquioxane (PAN/POSS)-derived carbon nanofibers (CNFs) were investigated in terms of POSS content (0–60 wt%) and activation process for their potential utilization as freestanding supercapacitor electrodes. For the purpose, a series of CNFs were manufactured by stabilization and carbonization of electrospun PAN/POSS nanofibers. The CNFs were then activated by potassium hydroxide (KOH) treatment to etch carbon and by hydrofluoric acid (HF) treatment to remove the POSS filler. Scanning electron microscopic images and energy dispersive X-ray spectra of PAN/POSS-based CNFs revealed the efficient removal of the POSS filler by KOH and HF treatments. The effect of POSS content on the porous structures of KOH/HF-treated CNFs was also confirmed by the specific surface area and pore size distribution analyses. The electrochemical performance of the CNFs was evaluated by using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD) test. KOH/HF-treated CNFs, which were fabricated from electrospun nanofibers with 40 wt% POSS, were found to have high specific capacitance of 257.7 F g− 1 at a scan rate of 5 mV s− 1 and 116.9 F g− 1 at 100 mV s− 1. The GCD results demonstrated that the CNFs have high specific capacitance of 138.7 F g− 1, energy density of 12.2 Wh kg− 1, and power density of 79.6 W kg− 1.

中文翻译:

基于聚丙烯腈和多面体低聚倍半硅氧烷的碳纳米纤维的独立式超级电容器电极应用

摘要 研究了聚丙烯腈/多面体低聚倍半硅氧烷 (PAN/POSS) 衍生的碳纳米纤维 (CNF) 的微观结构和电化学性能,包括 POSS 含量 (0-60 wt%) 和活化过程,以作为独立式超级电容器电极的潜在用途。为此,通过电纺 PAN/POSS 纳米纤维的稳定和碳化制造了一系列 CNF。然后通过氢氧化钾 (KOH) 处理激活 CNF 以蚀刻碳,并通过氢氟酸 (HF) 处理去除 POSS 填料。PAN/POSS 基 CNF 的扫描电子显微图像和能量色散 X 射线光谱表明,KOH 和 HF 处理可有效去除 POSS 填料。比表面积和孔径分布分析也证实了 POSS 含量对 KOH/HF 处理的 CNF 多孔结构的影响。通过使用循环伏安法 (CV) 和恒电流充放电 (GCD) 测试来评估 CNF 的电化学性能。KOH/HF 处理的 CNF 由具有 40 wt% POSS 的电纺纳米纤维制成,在 5 mV s- 1 的扫描速率下具有 257.7 F g- 1 的高比电容,在 100 时具有 116.9 F g- 1 的高比电容mV s- 1. GCD 结果表明,CNF 具有 138.7 F g- 1 的高比电容、12.2 Wh kg- 1 的能量密度和 79.6 W kg- 1 的功率密度。通过使用循环伏安法 (CV) 和恒电流充放电 (GCD) 测试来评估 CNF 的电化学性能。KOH/HF 处理的 CNF 由具有 40 wt% POSS 的电纺纳米纤维制成,在 5 mV s- 1 的扫描速率下具有 257.7 F g- 1 的高比电容,在 100 时具有 116.9 F g- 1 的高比电容mV s- 1. GCD 结果表明,CNF 具有 138.7 F g- 1 的高比电容、12.2 Wh kg- 1 的能量密度和 79.6 W kg- 1 的功率密度。通过使用循环伏安法 (CV) 和恒电流充放电 (GCD) 测试来评估 CNF 的电化学性能。KOH/HF 处理的 CNF 由具有 40 wt% POSS 的电纺纳米纤维制成,在 5 mV s- 1 的扫描速率下具有 257.7 F g- 1 的高比电容,在 100 时具有 116.9 F g- 1 的高比电容mV s- 1. GCD 结果表明,CNF 具有 138.7 F g- 1 的高比电容、12.2 Wh kg- 1 的能量密度和 79.6 W kg- 1 的功率密度。
更新日期:2018-02-01
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