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NiCo2O4 nanostructure-decorated PAN/lignin based carbon nanofiber electrodes with excellent cyclability for flexible hybrid supercapacitors
Polymer ( IF 4.1 ) Pub Date : 2017-10-26 , DOI: 10.1016/j.polymer.2017.10.051
Danyun Lei , Xiang-Dan Li , Min-Kang Seo , Myung-Seob Khil , Hak-Yong Kim , Byoung-Suhk Kim

Nanostructured binary metal oxide-decorated carbon nanofibers (CNFs) were utilized as flexible electrodes for hybrid supercapacitor applications. Polyacrylonitrile (PAN)/lignin based carbon nanofibers (PAN/lignin CNFs) with different contents of lignin were prepared by electrospinning, stabilization and carbonization. Afterwards, the NiCo2O4 oxides were deposited on the surface of CNFs by a facile hydrothermal method without any toxic reagents. SEM images confirmed that the NiCo2O4 (nanosheet and nanoneedle) nanostructures were uniformly grown on the surface of every carbon fiber. The obtained flexible NiCo2O4-decorated PAN/lignin CNFs with 50% lignin (NiCo2O4@CNF55) electrode exhibited high specific capacitance of the ∼1757 F g−1 at 2 mA cm−2 and excellent cyclability with ∼138% capacitance retention after 5000 cycles at 7 mA cm−2, suggesting lower internal resistance and higher electrochemical reversibility. In addition, the NiCo2O4@CNFs//N-rGO solid state asymmetric supercapacitor devices were assembled in order to evaluate their practical applications. The NiCo2O4@CNF55//N-rGO asymmetric supercapacitor device exhibited a specific capacitance of 134.3 F g−1 at a current densities of 1 A g−1, and possessed a maximum energy density of 47.75 Wh kg−1 with a power density of 799.53 W kg−1.



中文翻译:

NiCo 2 O 4纳米结构修饰的PAN /木质素基碳纳米纤维电极,具有出色的可循环性,可用于柔性混合超级电容器

纳米结构的二元金属氧化物修饰的碳纳米纤维(CNF)被用作混合超级电容器应用的柔性电极。通过静电纺丝,稳定化和碳化制备了木质素含量不同的聚丙烯腈(PAN)/木质素基碳纳米纤维(PAN /木质素CNF)。然后,通过简便的水热方法将NiCo 2 O 4氧化物沉积在CNF的表面上,而无需使用任何有毒的试剂。SEM图像证实了NiCo 2 O 4(纳米片和纳米针)纳米结构均匀地生长在每根碳纤维的表面上。获得的具有50%木质素的柔性NiCo 2 O 4装饰的PAN /木质素CNF(NiCo 2O 4 @ CNF55)电极在2 mA cm -2时表现出约1757 F g -1的高比电容,在7 mA cm -2的5000次循环后具有出色的可循环性和约138%的电容保持率,表明较低的内阻和较高的电化学性能可逆性。另外,组装了NiCo 2 O 4 @ CNFs // N-rGO固态不对称超级电容器器件,以评估其实际应用。的镍钴2 ö 4 @ CNF55 // N-二RGO不对称超级电容器装置表现出134.3 F G的特定电容-1在1A g的电流密度-1,并且具有47.75 Wh kg -1的最大能量密度和799.53 W kg -1的功率密度。

更新日期:2017-10-26
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